堆栈问题1

堆栈问题1

package com.example.web;

import java.util.HashMap;

public class Test {
    private static int i = 1;
    private static String x = "test";
    private static HashMap<String, String> map = new HashMap();

    public static void main(String[] args) {
        addInt(i);
        System.out.println(i); //1
        addString(x);
        System.out.println(x);//test
        addMap(map);
        map.forEach((key, value) -> System.out.println(key+value));//keyvalue
    }

    private static void addInt(int i) {
        i++;
    }

    private static void addString(String x) {
        x = x + "test";
    }

    private static void addMap(HashMap map) {
        map.put("key", "value");
    }
}