一.使用java8lambd测试
main方法中：
IntStream.range(0,10).forEach(
i->new Thread(()->System.out.println(Thread.currentThread().getName()+"=====>>>>"+SingleTest.getInstance())).start());
二.使用Set集合验证
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public class ThreadTest implements Runnable {
//存放单例对象，使用Set是为了不存放重复元素
public Set singles = new HashSet();
@Override
public void run() {
//获取单例
SingleDemo s = SingleDemo.getInstance();
//添加单例
singles.add(s);
}
}
使用多线程并发访问单例：
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public class ThreadDemo3 {
public static void main(String[] args) {
// SingleDemo s1 = SingleDemo.getInstance();
// SingleDemo s2 = SingleDemo.getInstance();
// System.out.println(s2 == s2);
ThreadTest t = new ThreadTest();
new Thread(t).start();
new Thread(t).start();
new Thread(t).start();
new Thread(t).start();
new Thread(t).start();
new Thread(t).start();
new Thread(t).start();
new Thread(t).start();
System.out.println(t.singles);
}
}
//看不出结果改成下面这样 同时在懒汉式取单例方法中添加Thread.sleep(50);//让多个线程竞争
public class ThreadDemo3 {
public static void main(String[] args) {
// SingleDemo s1 = SingleDemo.getInstance();
// SingleDemo s2 = SingleDemo.getInstance();
// System.out.println(s2 == s2);
ThreadTest t = new ThreadTest();
new Thread(t).start();
new Thread(t).start();
new Thread(t).start();
new Thread(t).start();
new Thread(t).start();
new Thread(t).start();
new Thread(t).start();
new Thread(t).start();
try {
Thread.sleep(2000);//让主线程等等子线程任务执行
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(t.singles);
}
}
