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Java String: Exercises, Practice, Solution

Java String Exercises [112 exercises with solution]

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1. Write a Java program to get the character at the given index within the string.

Sample Output:

Original String = Java Exercises!                                                                             
The character at position 0 is J                                                                              
The character at position 10 is i 

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2. Write a Java program to get the character (Unicode code point) at the given index within the string.

Sample Output:

Original String : w3resource.com                                                                              
Character(unicode point) = 51                                                                                 
Character(unicode point) = 101 

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3. Write a Java program to get the character (Unicode code point) before the specified index within the string.

Sample Output:

Original String : w3resource.com                                                                              
Character(unicode point) = 119                                                                                
Character(unicode point) = 99

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4. Write a Java program to count Unicode code points in the specified text range of a string.

Sample Output:

Original String : w3rsource.com                                                                               
Codepoint count = 9

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5. Write a Java program to compare two strings lexicographically.
Two strings are lexicographically equal if they are the same length and contain the same characters in the same positions.

Sample Output:

String 1: This is Exercise 1                                                                                  
String 2: This is Exercise 2                                                                                  
"This is Exercise 1" is less than "This is Exercise 2" 

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6. Write a Java program to compare two strings lexicographically, ignoring case differences.

Sample Output:

String 1: This is exercise 1                                                                                  
String 2: This is Exercise 1                                                                                  
"This is exercise 1" is equal to "This is Exercise 1"

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7. Write a Java program to concatenate a given string to the end of another string.

Sample Output:

String 1: PHP Exercises and                                                                                   
String 2: Python Exercises                                                                                    
The concatenated string: PHP Exercises and Python Exercises

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8. Write a Java program to test if a given string contains the specified sequence of char values.

Sample Output:

Original String: PHP Exercises and Python Exercises                                                           
Specified sequence of char values: and                                                                        
true 

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9. Write a Java program to compare a given string to the specified character sequence.

Sample Output:

Comparing example.com and example.com: true                                                                   
Comparing Example.com and example.com: false

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10. Write a Java program to compare a given string to a specified string buffer.

Sample Output:

Comparing example.com and example.com: true                                                                   
Comparing Example.com and example.com: false 

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11. Write a Java program to create a String object with a character array.

Sample Output:

The book contains 234 pages.

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12. Write a Java program to check whether a given string ends with another string.

Sample Output:

"Python Exercises" ends with "se"? false                                                                      
"Python Exercise" ends with "se"? true

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13. Write a Java program to check whether two String objects contain the same data.

Sample Output:

"Stephen Edwin King" equals "Walter Winchell"? false                                                          
"Stephen Edwin King" equals "Mike Royko"? false

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14. Write a Java program to compare a given string to another string, ignoring case considerations.

Sample Output:

"Stephen Edwin King" equals "Walter Winchell"? false                                                          
"Stephen Edwin King" equals "stephen edwin king"? true 

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15. Write a Java program to print the current date and time in the specified format.

Sample Output:

Current Date and Time :                                                                                       
June 19, 2017                                                                                                 
3:13 pm 
N.B. : The current date and time will change according to your system date and time.

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16. Write a Java program to get the contents of a given string as a byte array.

Sample Output:

The new String equals This is a sample String.

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17. Write a Java program to get the contents of a given string as a character array.

Sample Output:

The char array equals "[C@2a139a55"

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18. Write a Java program to create a distinct identifier for a given string.

Sample Output:

The hash for Python Exercises. is 863132599 

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19. Write a Java program to get the index of all the characters of the alphabet.

Sample Output:

a  b c  d e  f  g h i  j                                                                                     
=========================                                                                                     
36 10 7 40 2 16 42 1 6 20                                                                                     
                                                                                                   
k  l  m  n  o  p q  r  s  t                                                                                   
===========================                                                                                   
8 35 22 14 12 23 4 11 24 31                                                                                   

u  v  w  x  y  z                                                                                              
================                                                                                              
5 27 13 18 38 37

Sample string of all alphabet: "The quick brown fox jumps over the lazy dog."

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20. Write a Java program to get the Canonical representation of the string object.

Sample Output:

str1 == str2? false                                                                                           
str1 == str3? true

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21. Write a Java program to get the last index of a string within a string.

Sample Output:

 a  b c  d  e  f  g  h i  j                                                                                   
===========================                                                                                   
36 10 7 40 33 16 42 32 6 20                                                                                   
                                                                                                              
k  l  m  n  o  p q  r  s  t                                                                                   
===========================                                                                                   
8 35 22 14 41 23 4 29 24 31                                                                                   
                                                                                                              
 u  v  w  x  y  z                                                                                             
=================                                                                                             
21 27 13 18 38 37

Sample string of all alphabet: "The quick brown fox jumps over the lazy dog."

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22. Write a Java program to get the length of a given string.

Sample Output:

The string length of 'example.com' is: 11

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23. Write a Java program to find out whether a region in the current string matches a region in another string.

Sample Output:

str1[0 - 7] == str2[28 - 35]? true                                                                            
str1[9 - 15] == str2[9 - 15]? false 

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24. Write a Java program to replace a specified character with another character.

Sample Output:

Original string: The quick brown fox jumps over the lazy dog.                                                 
New String: The quick brown fox jumps over the lazy fog.

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25. Write a Java program to replace each substring of a given string that matches the given regular expression with the given replacement.

Sample string : "The quick brown fox jumps over the lazy dog."

In the above string replace all the fox with cat.

Sample Output:

Original string: The quick brown fox jumps over the lazy dog.                                                 
New String: The quick brown cat jumps over the lazy dog.         

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26. Write a Java program to check whether a given string starts with another string.

Sample Output:

Red is favorite color. starts with Red? true                                                                  
Orange is also my favorite color. starts with Red? false

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27. Write a Java program to get a substring of a given string at two specified positions.

Sample Output:

old = The quick brown fox jumps over the lazy dog.                                                            
new = brown fox jumps

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28. Write a Java program to create a character array containing a string.

Sample Output:

Java Exercises.

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29. Write a Java program to convert all characters in a string to lowercase.

Sample Output:

Original String: The Quick BroWn FoX!                                                                         
String in lowercase: the quick brown fox!

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30. Write a Java program to convert all characters in a string to uppercase.

Sample Output:

Original String: The Quick BroWn FoX!                                                                         
String in uppercase: THE QUICK BROWN FOX!  

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31. Write a Java program to trim leading or trailing whitespace from a given string.

Sample Output:

Original String:  Java Exercises                                                                              
New String: Java Exercises

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32. Write a Java program to find the longest Palindromic Substring within a string.

Sample Output:

The given string is: thequickbrownfoxxofnworbquickthe
The longest palindrome substring in the giv
en string is; brownfoxxofnworb
The length of the palindromic substring is: 16

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33. Write a Java program to find all interleavings of given strings.

Sample Output:

The given strings are: WX  YZ
The interleavings strings are: 
YWZX
WYZX
YWXZ
WXYZ
YZWX
WYXZ

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34. Write a Java program to find the second most frequent character in a given string.

Sample Output:

The given string is: successes
The second most frequent char in the string is: c

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35. Write a Java program to print all permutations of a given string with repetition.

Sample Output:

The given string is: PQR
The permuted strings are:
PPP
PPQ
PPR
...
RRP
RRQ
RRR

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36. Write a Java program to check whether two strings interlive of a given string. Assuming that unique characters are present in both strings.

Sample Output:

The given string is: PMQNO
The interleaving strings are MNO and PQ
The given string is interleaving: true

The given string is: PNQMO
The interleaving strings are MNO and PQ
The given string is interleaving: false

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37. Write a Java program to find the length of the longest substring of a given string without repeating characters.

Sample Output:

Input String : pickoutthelongestsubstring
The longest substring : [u, b, s, t, r, i, n, g]
The longest Substring Length : 8

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38. Write a Java program to print the result of removing duplicates from a given string.

Sample Output:

The given string is: w3resource
After removing duplicates characters the new string is: w3resouc

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39. Write a Java program to find the first non-repeating character in a string.

Sample Output:

The given string is: gibblegabbler
The first non repeated character in String is: i

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40. Write a Java program to divide a string into n equal parts.

Sample Output:

The given string is: abcdefghijklmnopqrstuvwxy
The string divided into 5 parts and they are: 

abcde
fghij
klmno
pqrst
uvwxy

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41. Write a Java program to remove duplicate characters from a given string that appear in another given string.

Sample Output:

The given string is: the quick brown fox
The given mask string is: queen

The new string is: 
th ick brow fox

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42. Write a Java program to print a list of items containing all characters of a given word.

Sample Output:

The given strings are: rabbit   bribe   dog   
The given word is: bib 

The strings containing all the letters of the given word are: 
rabbit
bribe

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43. Write a Java program to find the character in a string that occurs the most frequently.

Sample Output:

The given string is: test string
Max occurring character in the given string is: t

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44. Write a Java program to reverse a string using recursion.

Sample Output:

The given string is: The quick brown fox jumps
The string in reverse order is:
spmuj xof nworb kciuq ehT

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45. Write a Java program to reverse words in a given string.

Sample Output:

The given string is: Reverse words in a given string
The new string after reversed the words: string given a in words Reverse

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46. Write a Java program to reverse every word in a string using methods.

Sample Output:

The given string is: This is a test string
The string reversed word by word is: 
sihT si a tset gnirts

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47. Write a Java program to rearrange a string so that the same characters are positioned a distance away.

Sample Output:

The given string is: accessories
The string after arrange newly is: 
secrsecisao

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48. Write a Java program to remove "b" and "ac" from a given string.

Sample Output:

The given string is: abrambabasc
After removing the new string is: aramaasc

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49. Write a Java program to find the first non-repeating character from a stream of characters.

Sample Output:

String: godisgood
Reading: g
The first non-repeating character so far is:  g
Reading: o
The first non-repeating character so far is:  g
Reading: d
The first non-repeating character so far is:  g
Reading: i
The first non-repeating character so far is:  g
Reading: s
The first non-repeating character so far is:  g
Reading: g
The first non-repeating character so far is:  o
Reading: o
The first non-repeating character so far is:  d
Reading: o
The first non-repeating character so far is:  d
Reading: d
The first non-repeating character so far is:  i

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50. Write a Java program to find the lexicographic rank of a given string.

Sample Output:

The Given String is: BDCA
The Lexicographic rank of the given string is: 12

N.B.: Total possible permutations of BDCA are(lexicographic order) :
ABCD ABDC ACBD ACDB ADBC ADCB BACD BADC BCAD BCDA BDAC BDCA
1   2   3   4   5   6   7   8   9   10   11   12
The BDCA appear in 12 position of permutation (lexicographic order).

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51. Write a Java program to count and print all duplicates in the input string.

Sample Output:

The given string is: w3resource
The duplicate characters and counts are: 
e  appears  2  times
r  appears  2  times

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52. Write a Java program to check if two given strings are rotations of each other.

Sample Output:

The given strings are: ABACD  and  CDABA

The concatination of 1st string twice is: ABACDABACD
The 2nd string CDABA  exists in the new string.

Strings are rotations of each other

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53. Write a Java program to match two strings where one string contains wildcard characters.

Sample Output:

The given string is: abcdhgh
The given pattern string is: abc*d?*
The given pattern is matching.

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54. Write a Java program to find the smallest window in a string containing all characters in another string.

Sample Output:

The given string is: welcome to w3resource
Characters to find in the main sring are: tower
The smallest window which contains the finding characters is : to w3re

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55. Write a Java program to remove all adjacent duplicates recursively from a given string.

Sample Output:

The given string is: aabaarbarccrabmq
The new string after removing all adjacent duplicates is:
brmq

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56. Write a Java program that appends two strings, omitting one character if the concatenation creates double characters.

Sample Output:

The given strings are: food  and  door
The string after concatination are: foodoor

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57. Write a Java program to create a string from a given string by swapping the last two characters of the given string. The string length must be two or more.

Sample Output:

The given strings is: string
The string after swap last two characters are: strign

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58. Write a Java program to read a string and return true if it ends with a specified string of length 2.

Sample Output:

The given strings is: string
The string containing ng at last: true

The given strings is: strign
The string containing ng at last: false

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59. Write a Java program to read a string. If the string begins with "red" or "black" return that color string, otherwise return the empty string.

Sample Output:

The given strings is: blacksea
The string begins with the color: black

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60. Write a Java program to read two strings append them together and return the result. If the strings are different lengths, remove characters from the beginning of the longer string and make them equal lengths.

Sample Output:

The given strings is: Welcome and home
The new string is: comehome

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61. Write a Java program to create a new string taking specified number of characters from first and last position of a given string.

Sample Output:

The given strings is: Welcome
The given numbers is: 3
The new string is: Welome

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62. Write a Java program to read a string and return true if "good" appears starting at index 0 or 1 in the given string.

Sample Output:

The given strings is: goodboy
The 'good' appear in the string is: true

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63. Write a Java program to check whether the first two characters appear at the end of a given string.

Sample Output:

The given strings is: educated
The first two characters appear in the last is: true

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64. Write a Java program to read a string. If a substring of length two appears at both its beginning and end, return a string without the substring at the beginning; otherwise, return the original string unchanged.

Sample Output:

The given strings is: educated
The new string is: ucated

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65. Write a Java program to read a given string and return the string without the first or last characters if they are the same, otherwise return the string without the characters.

Sample Output:

The given strings is: testcricket
The new string is: estcricke

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66. Write a Java program to read a string and return it without the first two characters. Keep the first character if it is 'g' and keep the second character if it is 'h'.

Sample Output:

The given strings is: goat
The new string is: gat

he given strings is: photo
The new string is: hoto

The given strings is: ghost
The new string is: ghost

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67. Write a Java program to read a string and remove the first two characters if one or both are equal to a specified character, otherwise leave them unchanged.

Sample Output:

The given strings is: oocyte
The new string is: cyte

The given strings is: boat
The new string is: bat

The given strings is: own
The new string is: wn

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68. Write Java program to read a string and return after removing specified characters and their immediate left and right adjacent characters.

Sample Output:

The given strings is: test#string
The new string is: testring

The given strings is: test##string
The new string is: testring

The given strings is: test#the#string
The new string is: teshtring

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69. Write a Java program to return the substring that is between the first and last appearance of the substring 'toast' in the given string, or return an empty string if the substring 'toast' does not exist.

Sample Output:

The given strings is: sweettoastbuttertoast
The new string is: butter

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70. Write a Java program that checks if a string has pq-balance if it contains at least one 'q' directly after each ‘p’. But a 'q' before the 'p' invalidates pq-balance.

Sample Output:

The given strings is: gfpmpnppqab
The string is pq-balanced? true

The given strings is: gfpmpnpqpab
The string is pq-balanced? false

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71. Write a Java program to check two given strings whether any of them appears at the end of the other string (ignore case sensitivity).

Sample Output:

The given strings are: xyz  and pqrxyz
Is one string appears at the end of other? true

The given strings are: pqrxyz  and xyz
Is one string appears at the end of other? true

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72. Write a Java program to return true if a given string contains the string 'pop', but the middle 'o' also may contain another character.

Sample Output:

The given string is: dikchapop
Is p?p appear in the given string? true

The given string is: dikp$pdik
Is p?p appear in the given string? true

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73. Write a Java program to check whether a substring appears before a period(.) within a given string.

Sample Output:

The given strings is: testabc.test
Is 'abc' appear before period? true

The given string is: test.abctest
Is 'abc' appear before period? false

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74. Write a Java program to check whether a prefix string created using the first specific character in a given string appears somewhere else in the string.

Sample Output:

The given strings is: MrsJemsmrsam
The prefix string length is: 3
Is 'Mrs' appear else where in the string? false

The given string is: MrsJemsMrsam
The prefix string length is: 3
Is 'Mrs' appear else where in the string? true

Click me to see the solution

75. Write a Java program to check whether a given substring appears in the middle of another string. Here middle means the difference between the number of characters to the left and right of the given substring is not more than 1.

Sample Output:

The given string is: xxxabcxxxxx
Is abc appear in middle? false

The given string is: xxabcxxx
Is abc appear in middle? true

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76. Write a Java program to count how many times the substring 'life' appears anywhere in a given string. Counting can also happen with the substring 'li?e', any character instead of 'f'.

Sample Output:

The given string is: liveonwildlife
The substring life or li?e appear number of times: 2

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77. Write a Java program to add a string with a specific number of times separated by a substring.

Sample Output:

The given strings are: try  and  best
Number to times to be repeat: 3
The new string is: trybesttrybesttry

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78. Write a Java program to repeat a specific number of characters for a specific number of times from the last part of a given string.

Sample Output:

The given string is: string
The new string after repetition: inginging

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79. Write a Java program to create a string from a given string. This is done after removing the 2nd character from the substring of length three starting with 'z' and ending with 'g' presents in the said string.

Sample Output:

The given string is: zzgkitandkatcaketoket
The new string is: zgkitandkatcaketoket

Click me to see the solution

80. Write a Java program to check whether the character immediately before and after a specified character is the same in a given string.

Sample Output:

The given string is: moon#night
The before and after character are same: true

The given string is: bat##ball
The before and after character are same: false

The given string is: #moon#night
The before and after character are same: true

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81. Write a Java program to check whether two strings of length 3 and 4 appear the same number of times in a given string.

Sample Output:

The given string is: redcapmanwithbluecar
The appearance of red and blue are same: true

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82. Write a Java program to create a string containing every character twice of a given string.

Sample Output:

The given string is: welcome
The new string is: wweellccoommee

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83. Write a Java program to create a string from two given strings. This is so that each character of the two strings appears individually in the created string.

Sample Output:

The given strings  are: welcome  and  w3resource
The new string is: wwe3lrceosmoeurce

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84. Write a Java program to make an original string made of p number of characters from the first character in a given string. This is followed by p-1 number of characters till p is greater than zero.

Sample Output:

The given string is: welcome
Number of repetition characters and repetition: 4
The new string is: welcwelwew

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85. Write a Java program to make up a string with each character before and after a non-empty substring whichever it appears in a non-empty given string.

Sample Output:

The given string are: weablcoabmeab  and ab
The new string is: elome

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86. Write a Java program to count the number of triples (characters appearing three times in a row) in a given string.

Sample Output:

The given string is: welllcommmmeee
The number of triples in the string is: 4

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87. Write a Java program to check whether a specified character is happy or not. A character is happy when the same character appears to its left or right in a string.

Sample Output:

The given string is: azzlea
Is z happy in the string: true

The given string is: azmzlea
Is z happy in the string: falses

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88. Write a Java program to return a string where every appearance of the lowercase word 'is' has been replaced with 'is not'.

Sample Output:

The given string is: it is a string
The new string is: it is not a string

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89. Write a Java program to calculate the sum of the numbers that appear in a given string.

Sample Output:

The given string is: it 15 is25 a 20string
The sum of numbers in the string is: 60

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90. Write a Java program to check the number of times the two substrings appearing anywhere in a string.

Sample Output:

The given string is: Thisisthethesis
Are the appearance of 'the' and 'is' equal? false

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91. Write a Java program to count the number of words ending in 'm' or 'n' (not case sensitive) in a given text.

Sample Output:

The given string is: mam is in the room
The number of words ends eith m or n is: 3

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92. Write a Java program that returns a substring after removing all instances of remove string as given from the given main string.

Sample Output:

The main string is: This is the test string
The removable string is: st
The new string is: This is the te ring

Click me to see the solution

93. Write a Java program to find the longest substring that appears at both ends of a given string.

Sample Output:

The given string is: playersplay
The longest substring in the string is: play

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94. Write a Java program to find the longest mirror image string at both ends of a given string.

Sample Output:

The given string is: rotavator
The longest mirror image string in the string is: rotavator

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95. Write a Java program to return the sum of the digits present in the given string. In the absence of digits, the sum is 0.

Sample Output:

The given string is: ab5c2d4ef12s
The sum of the digits in the string is: 14

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96. Write a Java program to create a new string after removing a specified character from a given string. This is except the first and last position.

Sample Output:

The given string is: zebrazone
The new string is: zebraone

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97. Write a Java program to return a string with characters at index positions 0,1,2,5,6,7, ... from a given string.

Sample Output:

The given string is: w3resource.com
The new string is: w3rour.co

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98. Write a Java program to check whether the first instance of a given character is immediately followed by the same character in a given string.

Sample Output:

The given string is: fizzez
Is 'z' appear twice respectively? true

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99. Write a Java program to return an updated string using every character of even position from a given string.

Sample Output:

The given string is: w3resource.com
The new string is: wrsuc.o

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100. Write a Java program to check if a given string contains another string. Returns true or false.

Sample Output:

Original string:
Java is the foundation for virtually every type of networked application and is the global standard for developing and  delivering embedded and mobile applications, games, Web-based content,  and enterprise software. With more than 9 million developers worldwide, Java enables you to efficiently develop, deploy and use exciting applications and services.

Is 'million' present in the said text?
true

Is 'millions' present in the said text?
false

Click me to see the solution

101. Write a Java program to test if a string contains only digits. Returns true or false.

Sample Output:

First string:
131231231231231231231231231212312312
true

Second string:
13123123123Z1231231231231231212312312
false

Click me to see the solution

102. Write a Java program to convert a given string to int, long, floating and double.

Sample Output:

Convert String to int/Integer:
"1323" as int is 1323 and as Integer is 1323

Convert String to long/Long:
"13625478965325" as long is 13625478965325 and as Long is 13625478965325

Convert String to float/Float:
"25.135F" as float is 25.135 and as Float is 25.135

Convert String to double/Double:
"21.25478254D" as double is 21.25478254 and as Double is 21.25478254
false

Click me to see the solution

103. Write a Java program to remove a specified character from a given string.

Sample Output:

Original string:
abcdefabcdeabcdaaa

Second string:
bcdefbcdebcd

Click me to see the solution

104. Write a Java program to sort in ascending and descending order by the length of the given array of strings.

Sample Output:

Original unsorted colors: [Green, White, Black, Pink, Orange, Blue, Champagne, Indigo, Ivory]

Sorted color (descending order): [Champagne, Orange, Indigo, Green, White, Black, Ivory, Pink, Blue]

Sorted color (ascending order): [Pink, Blue, Green, White, Black, Ivory, Orange, Indigo, Champagne]

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105. Write a Java program to count the occurrences of a given string in another given string.

Sample Output:

aa' has occured 3 times in 'abcd abc aabc baa abcaa'

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106. Write a Java program to concatenate a given string with itself a given number of times.

Sample Output:

Original string: PHP

After repeating 7 times: PHPPHPPHPPHPPHPPHPPHP

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107. Write a Java program to count occurrences of a certain character in a given string.

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108. Write a Java program to check whether there are two consecutive (following each other continuously), identical letters in a given string.

Sample Output:

Original word: Follow
If there are two consecutive identical letters in the said string: true
Original word: Java
If there are two consecutive identical letters in the said string: false
Original word: Yellow
If there are two consecutive identical letters in the said string: true

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109. Write a Java program that reverses all odd-length words in a string.

Sample Output:

Original text: Check two consecutive identical letters in a given string

Reverses the words in the string that have odd lengths:
Check two consecutive identical letters ni a given gnirts

Original text: Create a Date object using the Calendar class

Reverses the words in the string that have odd lengths:
etaerC a etaD tcejbo using the radnelaC class

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110. Write a Java program to count the number of characters (alphanumeric only) that occur more than twice in a given string.

Sample Output:

Original String: abcdaa
Number of duplicate characters in the said String (Occurs more than twice.): 1

Original String: Create a Date Calendar.
Number of duplicate characters in the said String (Occurs more than twice.): 3

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111. Write a Java program that removes a specified word from given text. Return the updated string..

Sample Output:

Input a string: 
 Exercises Practice Solution
Input a word to remove: 
 Solution
New string, after removing the said word:
Exercises Practice 

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112. A string is created by using another string's letters. Letters are case sensitive. Write a Java program that checks the letters of the second string are present in the first string. Return true otherwise false.

Sample Output:

Input the first string: 
 Java
Input the second string: 
 Ja
Check first string contains letters from the second string:
true

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Java Code Editor

More to Come !

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