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Merge pull request #583 from shaiktaj/patch-1

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Updated ThreadSafeLazyLoadedivoryTower
This commit is contained in:
Ilkka Seppälä 2017-08-12 16:58:01 +03:00 committed by GitHub
commit 600553ec0f
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 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