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3033e4c9
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体验新版 GitCode,发现更多精彩内容 >>
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3033e4c9
编写于
6月 10, 2020
作者:
I
Ilkka Seppälä
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差异文件
Improve lazy loaded Singleton example
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e68beb40
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1
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1 changed file
with
8 addition
and
7 deletion
+8
-7
singleton/src/main/java/com/iluwatar/singleton/ThreadSafeLazyLoadedIvoryTower.java
...om/iluwatar/singleton/ThreadSafeLazyLoadedIvoryTower.java
+8
-7
未找到文件。
singleton/src/main/java/com/iluwatar/singleton/ThreadSafeLazyLoadedIvoryTower.java
浏览文件 @
3033e4c9
...
...
@@ -27,15 +27,13 @@ package com.iluwatar.singleton;
* <p>Thread-safe Singleton class. The instance is lazily initialized and thus needs synchronization
* mechanism.</p>
*
* <p>Note: if created by reflection then a singleton will not be created but multiple options
* in the same classloader</p>
*/
public
final
class
ThreadSafeLazyLoadedIvoryTower
{
private
static
ThreadSafeLazyLoadedIvoryTower
instance
;
private
static
volatile
ThreadSafeLazyLoadedIvoryTower
instance
;
private
ThreadSafeLazyLoadedIvoryTower
()
{
//
p
rotect against instantiation via reflection
//
P
rotect against instantiation via reflection
if
(
instance
==
null
)
{
instance
=
this
;
}
else
{
...
...
@@ -44,13 +42,16 @@ public final class ThreadSafeLazyLoadedIvoryTower {
}
/**
* The instance
gets created only when it is called for first time. Lazy-loading
* The instance
doesn't get created until the method is called for the first time
*/
public
static
synchronized
ThreadSafeLazyLoadedIvoryTower
getInstance
()
{
if
(
instance
==
null
)
{
instance
=
new
ThreadSafeLazyLoadedIvoryTower
();
synchronized
(
ThreadSafeLazyLoadedIvoryTower
.
class
)
{
if
(
instance
==
null
)
{
instance
=
new
ThreadSafeLazyLoadedIvoryTower
();
}
}
}
return
instance
;
}
}
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