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Updated ThreadSafeLazyLoadedivoryTower

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Added null check in private constructor to prevent instantiating by Reflection call
This commit is contained in:
shaiktaj 2017-05-25 11:04:30 -05:00 committed by GitHub
parent ae1d9cf7a8
commit 24f258848c
1 changed files with 6 additions and 1 deletions
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7
singleton/src/main/java/com/iluwatar/singleton/ThreadSafeLazyLoadedIvoryTower.java
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@ -33,7 +33,12 @@ public final class ThreadSafeLazyLoadedIvoryTower {
private static ThreadSafeLazyLoadedIvoryTower instance; private static ThreadSafeLazyLoadedIvoryTower instance;
private ThreadSafeLazyLoadedIvoryTower() {} private ThreadSafeLazyLoadedIvoryTower() {
// to prevent instantiating by Reflection call
if (instance != null) {
throw new IllegalStateException("Already initialized.");
}
}
/** /**
* The instance gets created only when it is called for first time. Lazy-loading * The instance gets created only when it is called for first time. Lazy-loading