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Java String Exercises: Remove a specified character from a given string

Java String: Exercise-103 with Solution

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

Sample Solution:

Java Code:

public class Main {    
    public static void main(String[] args) {
       String str1 = "abcdefabcdeabcdaaa";
       char g_char = 'a';
        String result = remove_Character(str1, g_char);
        System.out.println("\nOriginal string:");
        System.out.println(str1);    
        System.out.println("\nSecond string:");
       System.out.println(result);                                
   }
  public static String remove_Character(String str1, char g_char) {
       if (str1 == null || str1.isEmpty()) {
          return "";
       }
       StringBuilder sb = new StringBuilder();
       char[] chArray = str1.toCharArray();
       for (int i = 0; i < chArray.length; i++) {
           if (chArray[i] != g_char) {
               sb.append(chArray[i]);
           }
       }
       return sb.toString();
   }
}

Sample Output:

Original string:
abcdefabcdeabcdaaa

Second string:
bcdefbcdebcd

Pictorial Presentation:

Java String Exercises: Remove a specified character from a given string
Java String Exercises: Remove a specified character from a given string

Flowchart:

Flowchart: Java String Exercises - Remove a specified character from a given string

Java Code Editor:

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

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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