content: 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<Pojo> list = new ArrayList<Pojo>();
  
          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<Pojo> list) {
          // do nothing
      }
  
      public static void invoke(String a) {
          System.out.println(a);
      }
  }
  