NullPointerExceptions are exceptions that happen after you try and use a reference that factors to no site in memory (null) as if it were referencing an object.
To start with observation: the compilation succeeds! The challenge in This system will not be a compilation error. It's really a runtime
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During which case, You're not making the item obj, but fairly assuming that it absolutely was produced before the doSomething() system was known as. Notice, it is achievable to simply call the tactic similar to this:
Calling a technique on a null reference or seeking to entry a field of a null reference will induce a NullPointerException. They're the commonest, but other ways are shown on the NullPointerException javadoc webpage.
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jakub.gjakub.g 29k77 gold badges7676 silver badges116116 bronze badges 5 two Also, if x is a more sophisticated expression (like array or discipline obtain) in place of a single variable, its element expressions are actually only evaluated at the time as opposed to two times.
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In addition to NullPointerExceptions thrown due to the strategy's logic, you can also Test the method arguments for null values and throw NPEs explicitly by adding a thing like the following in close proximity to the beginning of a way: