【编程技巧】java不使用第三个变量处理两个变量的交换

public class SwapNum {
public static void main(String[] args) {
doSwapNum();
}
public static void doSwapNum(){
//利用加减法
int a = 10, b = 5;
a = a + b;
b = a – b;
a = a – b;
System.out.println("a=" + a + "\nb=" + b);
}
}