6.两个数交换

package test;

public class TestChange {
    public static void main(String[] args) {
        int num1=5;
        int num2=6;
        System.out.println("交换前：");
        System.out.println("num1:"+num1);
        System.out.println("num2:"+num2);
        int temp=num1;
        num1=num2;
        num2=temp;
        System.out.println("交换后：");
        System.out.println("num1:"+num1);
        System.out.println("num2:"+num2);
    }
}