string replace in java %s code example

Example 1: string replace java

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

Example 2: java string repalce

String str1 = "abc123abc123";
String str2 = str1.replace("abc", "0");
System.out.println(str2); // 01230123