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package collection;

import java.util.ArrayList;

import java.util.HashSet;

import java.util.List;

import java.util.Set;

/**

* @author vonzhou

* @date 2019/1/9

*/

public class TODO {

public static void main(String[] args) {

Set<String> s = new HashSet<>();

// s.add("a");

// s.add(null);

List<String> list = new ArrayList<>();

list.add("xxx");

list.clear();

list.addAll(s);

System.out.println(s);

for (int i = 0; i < 4; i++) {

new Thread(new Runnable() {

@Override

public void run() {

System.out.println(list);

System.out.println(list);

System.out.println(list);

System.out.println(list);

System.out.println(list);

}

}).start();

}

for (int i = 0; i < 4; i++) {

new Thread(new Runnable() {

@Override

public void run() {

list.clear();

list.add("xxxx");

list.add("a");

list.add("b");

list.add("c");

list.add("d");

}

}).start();

}

}

}