====== Java Lazy Evaluation ======
  * 늦은 초기화, Lazy initialization
  * [[https://4comprehension.com/leveraging-lambda-expressions-for-lazy-evaluation-in-java/|Leveraging Lambda Expressions for Lazy Evaluation in Java – { 4Comprehension }]]
    * [[https://github.com/pivovarit/articles/tree/master/java-lazy-initialization|articles/java-lazy-initialization at master · pivovarit/articles]]
  * [[java:guava:supplier|Guava Supplier]]
  * [[https://commons.apache.org/proper/commons-lang/javadocs/api-release/org/apache/commons/lang3/concurrent/LazyInitializer.html|LazyInitializer (Apache Commons Lang 3.10 API)]]

===== 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>