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Java String Exercises: Repeat a specific number of characters for specific number of times from the last part of a string

Java String: Exercise-78 with Solution

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

Sample Solution:

Java Code:

import java.util.*;
public class Main
{
public String lastNchrRepeat(String stng, int no_repeat) 
{
  int l = stng.length();
  String new_word = "";
  for (int i = 0; i < no_repeat; i++) 
  {
    new_word += stng.substring(l - no_repeat, l);
  }
  return new_word;
}
public static void main (String[] args)
    {
      Main m= new Main();
      String str1 =  "string";
      int no_char=3;
      System.out.println("The given string is: "+str1);
      System.out.println("The new string after repetition: "+m.lastNchrRepeat(str1,no_char));
	  }
}

Sample Output:

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

Pictorial Presentation:

Java String Exercises: Repeat a specific number of characters for specific number of times from the last part of a string.

Flowchart:

Flowchart: Java String Exercises - Repeat a specific number of characters for specific number of times from the last part of a string.

Java Code Editor:

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

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Java: Tips of the Day

Array vs ArrayLists:

The main difference between these two is that an Array is of fixed size so once you have created an Array you cannot change it but the ArrayList is not of fixed size. You can create instances of ArrayLists without specifying its size. So if you create such instances of an ArrayList without specifying its size Java will create an instance of an ArrayList of default size.

Once an ArrayList is full it re-sizes itself. In fact, an ArrayList is internally supported by an array. So when an ArrayList is resized it will slow down its performance a bit as the contents of the old Array must be copied to a new Array.

At the same time, it's compulsory to specify the size of an Array directly or indirectly while creating it. And also Arrays can store both primitives and objects while ArrayLists only can store objects.

Ref: https://bit.ly/3o8L2KH