package com.alibaba.arthas; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Random; /** * @author diecui1202 on 2017/9/13. */ public class Test { public static final Map m = new HashMap(); public static final Map n = new HashMap(); public static final Map p = null; static { m.put("a", "aaa"); m.put("b", "bbb"); n.put(Type.RUN, "aaa"); n.put(Type.STOP, "bbb"); } public static void main(String[] args) throws InterruptedException { List list = new ArrayList(); for (int i = 0; i < 40; i ++) { Pojo pojo = new Pojo(); pojo.setName("name " + i); pojo.setAge(i + 2); list.add(pojo); } System.out.println(p); while (true) { int random = new Random().nextInt(40); String name = list.get(random).getName(); list.get(random).setName(null); test(list); list.get(random).setName(name); Thread.sleep(1000L); } } public static void test(List list) { // do nothing } public static void invoke(String a) { System.out.println(a); } }