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a java lang nullpointerexception occurs when a java application or java applet has been badly coded typically the java program and consequently the programmer attempted to access the reference or handle to a java object that did not exist java lang nullpointerexception occurs when a java application or java applet has been badly coded typically the java program and consequently the programmer attempted to access the reference or handle to a java object that did not exist
One of the best way to avoid NullPointerException in Java is as simple as defining contracts and following them. Most of the NullPointerException occurs because Object is created with incomplete information or all required dependency is not provided.s I said earlier, if you know any other Java tips or best practice, which can help to reduce null check, then you can share with us by commenting on this article. 1) Call equals() and equalsIgnoreCase() method on known String literal rather unknown object. Always call equals() method on known String which is not null.