On the main line inside major, I am explicitly environment the item reference obj equivalent to null. This means I have a reference, but it is not pointing to any item.
NullPointerExceptions are exceptions that take place after you endeavor to make use of a reference that points to no location in memory (null) as if it were being referencing an item.
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Besides NullPointerExceptions thrown because of the tactic's logic, It's also possible to check the strategy arguments for null values and toss NPEs explicitly by adding a little something like the following near the start of a technique:
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The main line declares a variable named num, but it doesn't really consist of a primitive worth but. Rather, it contains a pointer (since the kind is Integer that is a reference variety). Since you haven't but stated what to place to, Java sets it to null, meaning "I am pointing to absolutely nothing
A NullPointerException is thrown at runtime Every time your software attempts to implement a null like it had been an actual reference. One example is, in the event you create this:
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The NullPointerException (NPE) occurs if you declare a variable but didn't develop an object and assign it to your variable in advance of attempting to utilize the contents from the variable (referred to as dereferencing
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There are numerous ways that you could use a null value that will end in a NullPointerException. In reality, the only real issues you could
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