Web Reference: Reference variables can be set to null which means " I am referencing nothing ". You can get a null value in a reference variable if you explicitly set it that way, or a reference variable is uninitialized and the compiler does not catch it (Java will automatically set the variable to null). 3 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 ... Learn how to fix the error: 'Cannot invoke method on a null object' in programming with our expert guide and code examples.
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