Java Lazy Evaluation

• 늦은 초기화, Lazy initialization
• Leveraging Lambda Expressions for Lazy Evaluation in Java – { 4Comprehension }
  • articles/java-lazy-initialization at master · pivovarit/articles
• Guava Supplier
• LazyInitializer (Apache Commons Lang 3.10 API)

• https://github.com/jbloch/effective-java-3e-source-code/blob/master/src/effectivejava/chapter11/item83/Initialization.java
• Double-check idiom for lazy initialization of instance fields. Broken example. · Issue #8 · jbloch/effective-java-3e-source-code

// 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;
    }
}