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Fix issue #761: ThreadSafeDoubleCheckLocking.java: Instantiating by Reflection call will be successful if you do that firstly (#920)

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This commit is contained in:
Adrian Yao
2019-09-08 02:13:15 +08:00
committed by Ilkka Seppälä
parent 8c865e6b4d
commit f1410337b5
3 changed files with 25 additions and 1 deletions
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6
singleton/src/main/java/com/iluwatar/singleton/ThreadSafeDoubleCheckLocking.java
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@ -35,12 +35,16 @@ public final class ThreadSafeDoubleCheckLocking {
private static volatile ThreadSafeDoubleCheckLocking instance;
private static boolean flag = true;
/**
* private constructor to prevent client from instantiating.
*/
private ThreadSafeDoubleCheckLocking() {
// to prevent instantiating by Reflection call
if (instance != null) {
if (flag) {
flag = false;
} else {
throw new IllegalStateException("Already initialized.");
}
}