How java swaps two strings without using the third variable

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How to swap two strings without a third variable

That's interesting, isn't it? In particular, the premise is that the third variable is not used.

public class SwapTwoStrings { public static void main(String[] args) { String s1 = "silence"; String s2 = "King II"; 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 is as follows:

Wang Er was silent.

Tell me about my thoughts:

1)Concatenate two strings together using concat() method.

2)Then the substring() method takes the second string and the first string, respectively.

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