Null Pointer Exception Java Tutorial EIDOQS6x0OQ - Complete Information & Details

Web Reference: 2 days ago · What Is NullPointerException? NullPointerException (NPE) is the single most common runtime exception in Java. It is thrown when your code attempts to use an object reference that has not been assigned to an actual object -- in other words, the reference points to null. Every Java developer encounters this exception, from beginners writing their first class to senior engineers debugging ... Aug 5, 2025 · Explanation: In this example, the string reference "s" is null. When the program tries to call the length () method, it throws a NullPointerException because there is no actual object. Reference types in Java allow you to use the special value null which is the Java way of saying "no object". A NullPointerException is thrown at runtime whenever your program attempts to use a null as if it was a real reference.

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