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# Java Examples - Replacing a String

## Problem Description:

How to replace a substring inside a string by another one ?

## Solution:

This example describes how replace method of java String class can be used to replace character or substring by new one.

    public class StringReplaceEmp{
       public static void main(String args[]){
          String str="Hello World";
          System.out.println( str.replace( 'H','W' ) );
          System.out.println( str.replaceFirst("He", "Wa") );
          System.out.println( str.replaceAll("He", "Ha") );
       }
    }

## Result:

The above code sample will produce the following result.

    Wello World
    Wallo World
    Hallo World

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