引用对象

package com.cetc55;

public class Dome1 {

    public static void main(String[] args) {
    System.out.println("hallo world");

    int a = 100;

    int b = 200;

    int num = num (a,b);

    System.out.println(num);

    public static int num(int a, int b) {

    int num =a+b;

    return num;