The Optimum Method to Concatenate Strings in Java is the concat() method.
This method appends one String to the end of another. The method returns a String with the value of the String passed into the method, appended to the end of the String, used to invoke this method.
public class Test { public static void main(String args[]) { String s = "Strings are immutable"; s = s.concat(" all the time"); System.out.println(s); } }
Strings are immutable all the time