變數交換的三種方式

主要有三種方法:
最常見藉由第三方變數交換:byTemp(x , y)
數學式的藉由加減法:byAddSub(x , y)
效率最高的一種方法:byXor(x , y)

public class VariableExchange {
    
    public static void main(String args[]) {
        int x = 123;
        int y = 321;
        System.out.println("Before: x = " + x + " , " + "y = " + y);
        byTemp(x , y);
        byAddSub(x , y);
        byXor(x , y);
    }
    public static void byTemp(int x , int y) {
        int temp;
        temp = x;
        x = y;
        y = temp;
        System.out.println("byTemp(x,y): x = " + x + " , " + "y = " + y);
    }
    public static void byAddSub(int x , int y) {
        x = x + y;
        y = x - y;
        x = x - y;
        System.out.println("byAddSub(x,y): x = " + x + " , " + "y = " + y);
    }
    public static void byXor(int x , int y) {
        x = x ^ y;
        y = x ^ y;
        x = x ^ y;
        System.out.println("byXor(x,y): x = " + x + " , " + "y = " + y);
    }
}