Web Reference: Java NM - Example 5: Two variables can reference the same int array and both of them can modify it As you should know, Java types are divided into primitive types (boolean, int, etc.) and reference types. Reference types in Java allow you to use the special value nullwhich is the Java way of saying "no object". A NullPointerException is thrown at runtime whenever your program attempts to use a nullas if it was a real reference. For example, if y... Jan 16, 2026 · This can happen in various scenarios, such as when calling a method on a null object, accessing a field of a null object, or using an array with a null reference.
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