java:lazy_evaluation

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--- java:lazy_evaluation [2020/05/18 17:15]
kwon37xi 만듦
+++ java:lazy_evaluation [2020/05/18 17:41]
kwon37xi
@@ 줄 4: / 줄 4: @@
     * [[https://github.com/pivovarit/articles/tree/master/java-lazy-initialization|articles/java-lazy-initialization at master · pivovarit/articles]]
   * [[java:guava:supplier|Guava Supplier]]
+===== Effective Java 3rd Item 83 - double check =====
+  * https://github.com/jbloch/effective-java-3e-source-code/blob/master/src/effectivejava/chapter11/item83/Initialization.java
+  * [[https://github.com/jbloch/effective-java-3e-source-code/issues/8|Double-check idiom for lazy initialization of instance fields. Broken example. · Issue #8 · jbloch/effective-java-3e-source-code]]
+<code java>
+    // Double-check idiom for lazy initialization of instance fields - Page 334
+    private volatile FieldType field4;
+    // NOTE: The code for this method in the first printing had a serious error (see errata for details)!
+    private FieldType getField4() {
+        FieldType result = field4;
+        if (result != null) // First check (no locking)
+            return result;
+        synchronized(this) {
+            if (field4 == null) // Second check (with locking)
+                field4 = computeFieldValue();
+            return field4;
+        }
+    }
+</code>

java/lazy_evaluation.txt · 마지막으로 수정됨: 2020/05/19 09:28 저자 kwon37xi