Java String replace

The java string replace() method returns a string replacing all the old char or CharSequence to new char or CharSequence.

Since JDK 1.5, a new replace() method is introduced, allowing you to replace a sequence of char values.

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Signature

There are two type of replace methods in java string.

1. public String replace(char oldChar, char newChar)  
2. and  
3. public String replace(CharSequence target, CharSequence replacement)  

The second replace method is added since JDK 1.5.

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Parameters

oldChar : old character

newChar : new character

target : target sequence of characters

replacement : replacement sequence of characters

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Returns

replaced string

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

1. public class ReplaceExample1{  
2. public static void main(String args[]){  
3. String s1="javatpoint is a very good website";  
4. String replaceString=s1.replace('a','e');//replaces all occurrences of 'a' to 'e'  
5. System.out.println(replaceString);  
6. }}  

Output

jevetpoint is e very good website

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

1. public class ReplaceExample2{  
2. public static void main(String args[]){  
3. String s1="my name is khan my name is java";  
4. String replaceString=s1.replace("is","was");//replaces all occurrences of "is" to "was"  
5. System.out.println(replaceString);  
6. }}