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Update JavaConcurrencyAdvancedCommonInterviewQuestions.md

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单例模式实例修改，在单例方法上声明synchronized关键字是不必要的且会造成性能上的开销
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huangshangi 2020-06-16 10:21:01 +08:00 committed by GitHub
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docs/java/Multithread/JavaConcurrencyAdvancedCommonInterviewQuestions.md
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@ -73,7 +73,7 @@ public class Singleton {
private Singleton() { private Singleton() {
} }
public synchronized static Singleton getUniqueInstance() { public static Singleton getUniqueInstance() {
//先判断对象是否已经实例过，没有实例化过才进入加锁代码 //先判断对象是否已经实例过，没有实例化过才进入加锁代码
if (uniqueInstance == null) { if (uniqueInstance == null) {
//类对象加锁 //类对象加锁