Additional Notes
Unboxing pitfalls: What can go wrong?
Track: Java
Topic: Core Java
Focus: Wrapper Types and Autoboxing
Java: Wrapper Types and Autoboxing
Answer
Unboxing null values causes NullPointerExceptions.
Unboxing converts a wrapper to a primitive. If the wrapper is null, a NullPointerException occurs. Always check for null before unboxing. For instance, 'Integer value = null; int primitive = value;' throws an exception.
Unboxing converts a wrapper to a primitive. If the wrapper is null, a NullPointerException occurs. Always check for null before unboxing. For instance, 'Integer value = null; int primitive = value;' throws an exception.
Topics: Core Java Java Wrapper Types and Autoboxing