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Added comments to singleton app.

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This commit is contained in:
Ilkka Seppala 2014-11-26 22:47:44 +02:00
parent 34bc1de713
commit 470f3d2460
1 changed files with 3 additions and 0 deletions
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3
singleton/src/main/java/com/iluwatar/App.java
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@ -12,11 +12,13 @@ public class App {
public static void main(String[] args) { public static void main(String[] args) {
// eagerly initialized singleton
IvoryTower ivoryTower1 = IvoryTower.getInstance(); IvoryTower ivoryTower1 = IvoryTower.getInstance();
IvoryTower ivoryTower2 = IvoryTower.getInstance(); IvoryTower ivoryTower2 = IvoryTower.getInstance();
System.out.println("ivoryTower1=" + ivoryTower1); System.out.println("ivoryTower1=" + ivoryTower1);
System.out.println("ivoryTower2=" + ivoryTower2); System.out.println("ivoryTower2=" + ivoryTower2);
// lazily initialized singleton
ThreadSafeLazyLoadedIvoryTower threadSafeIvoryTower1 = ThreadSafeLazyLoadedIvoryTower ThreadSafeLazyLoadedIvoryTower threadSafeIvoryTower1 = ThreadSafeLazyLoadedIvoryTower
.getInstance(); .getInstance();
ThreadSafeLazyLoadedIvoryTower threadSafeIvoryTower2 = ThreadSafeLazyLoadedIvoryTower ThreadSafeLazyLoadedIvoryTower threadSafeIvoryTower2 = ThreadSafeLazyLoadedIvoryTower
@ -24,6 +26,7 @@ public class App {
System.out.println("threadSafeIvoryTower1=" + threadSafeIvoryTower1); System.out.println("threadSafeIvoryTower1=" + threadSafeIvoryTower1);
System.out.println("threadSafeIvoryTower2=" + threadSafeIvoryTower2); System.out.println("threadSafeIvoryTower2=" + threadSafeIvoryTower2);
// enum singleton
EnumIvoryTower enumIvoryTower1 = EnumIvoryTower.INSTANCE; EnumIvoryTower enumIvoryTower1 = EnumIvoryTower.INSTANCE;
EnumIvoryTower enumIvoryTower2 = EnumIvoryTower.INSTANCE; EnumIvoryTower enumIvoryTower2 = EnumIvoryTower.INSTANCE;
System.out.println("enumIvoryTower1=" + enumIvoryTower1); System.out.println("enumIvoryTower1=" + enumIvoryTower1);