2. 21. 3. Replacing Characters in a String: replace() method creates a new string with the replaced characters.
public class Main { public static void main(String[] argv) throws Exception {
String string = "this is a string";
// Replace all occurrences of 'a' with 'o'
String newString = string.replace('a', 'o');
System.out.println(newString);
}
}