交换两个变量而不使用第三个变量[关闭]

Question

在两行中编写一段代码，即交换两个变量而不使用第三个变量。在java中有可能吗

Answer 1

 public static void swap(int a, int b) { /* int variable*/

    a= a-b;
    b= a+ b;
    a= b-a;

    System.out.println("a = " + a);
    System.out.println("b = " + b);
}


public static void swap_String ( String a, String b) { /* for String*/

    a = a.concat(b);
    b = a.substring(0, (a.length() - b.length()));
    a = a.substring(b.length(), a.length());

    System.out.println("a = " + a);
    System.out.println("b = " + b);
}