Java String replace() method

Java String replace() method returns new String by replacing old characters with new characters or old CharSequence to new CharSequence.

Syntax:

public String replace(char oldChar, char newChar)
public String replace(CharSequence target, CharSequence replacement)

Parameters:

oldChar : old Character

newChar : new Character

target : target sequence of characters

replacement: replacement sequence of characters

Returns:

a new String i.e. replaced Strin

Java String replace(char old, char new) method example 1

    public class JavaStringReplaceEx1
    { 
    public static void main(String args[])
    { 
    String s1="W3lcom3 to the TutorialsAndExampl3"; 
    String replaceString=s1.replace('3','e');//replaces all occurrences of '3' to 'e' 
    System.out.println(replaceString); 
       }    
    }

Output:

Welcome to the TutorialsAndExample

Java String replace(CharSequence target, CharSequence replacement) method example 2

    public class JavaStringReplaceEx2
    { 
             public static void main(String args[])
             { 
    String s1="Welcome to rock TutorialAndExample"; 
    String replaceString=s1.replace("rock","the");//replaces all occurrences of "rock" to "the" 
    System.out.println(replaceString); 
              }     
     }

Output:

Welcome to the TutorialAndExample

Java String replace method Example 3

public class JavaStringReplaceEx3 { 
    public static void main(String[] args) { 
        String str = "JABA IS THE BEST"; 
        String rs = str.replace("JABA","JAVA");
        System.out.println(rs);
        String str1 = rs.concat(" PROGRAMMING LANGUAGE");
        System.out.println(str1);
        String rs2 = str1.replace("THE BEST","A OBJECT ORIENTED");
        System.out.println(rs2);
    } 
}

Output:

JAVA IS THE BEST
JAVA IS THE BEST PROGRAMMING LANGUAGE
JAVA IS A OBJECT ORIENTED PROGRAMMING LANGUAGE

Java String replace method Example 4

public class JavaStringReplaceEx4 { 
    public static void main(String[] args) { 
       String a = "HelloBrother How are you!";
       String r = a.replace("HelloBrother","Brother");
       System.out.println(r);
    } 
}

Output:

Brother How are you!