wlc19981111的博客

加同步块与volatile即可public class MyBenchmark { public static void main(String[] args) { new Thread(() -> { Singleton instance1 = Singleton.getInstance(); }, "t1").start(); new Thread(() -> { Singleton instance2 = Singleton.getInstance();

创建对象实例的static方法前加synchronized即可public class SingletonTest03 { public static void main(String[] args) { new Thread(()-> { Singleton instance1 = Singleton.getInstance(); },"t1").start(); new Thread(()-> { Singleton instance2 = Singleto

public class MyBenchmark { public static void main(String[] args) { new Thread(()-> { Singleton instance1 = Singleton.getInstance(); },"t1").start(); new Thread(()-> { Singleton instance2 = Singleton.getInstance(); },"t2").start();