Update JavaConcurrencyAdvancedCommonInterviewQuestions.md

Snailclimb · Snailclimb · commit 767e712351cc · 2020-05-16T15:31:26.000+08:00
diff --git a/docs/java/Multithread/JavaConcurrencyAdvancedCommonInterviewQuestions.md b/docs/java/Multithread/JavaConcurrencyAdvancedCommonInterviewQuestions.md
@@ -73,7 +73,7 @@ public class Singleton {
     private Singleton() {
     }
 
-    public static Singleton getUniqueInstance() {
+    public synchronized 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
         if (uniqueInstance == null) {
             //类对象加锁

Original file line number	Diff line number	Diff line change
`@@ -73,7 +73,7 @@ public class Singleton {`
`73`	`73`	`private Singleton() {`
`74`	`74`	`}`
`75`	`75`
`76`		`- public static Singleton getUniqueInstance() {`
	`76`	`+ public synchronized static Singleton getUniqueInstance() {`
`77`	`77`	`//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`
`78`	`78`	`if (uniqueInstance == null) {`
`79`	`79`	`//类对象加锁`