How to swap two strings in Java without using a third variable?

How to exchange two strings without using the third variable

This question is a bit interesting, right? Especially the prerequisite, do not use the third variable.

public class SwapTwoStrings {     public static void main(String[] args) {         String s1 = "沉默";         String s2 = "王二";          s1 = s1.concat(s2);         s2 = s1.substring(0,s1.length()-s2.length());         s1 = s1.substring(s2.length());          System.out.println(s1);         System.out.println(s2);     } }

The output result is as follows:

王二 沉默

Let me talk about my ideas:

1) Splice two strings together through the concat() method.

2) Then take out the second string and the first string respectively through the substring() method.

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