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I found myself checking for this and asking if it's necessary. I have code like this:
public Object myMethod(Object... many) { if (many == null || many.length == 0) return this; for (Object one : many) doSomethingWith(one); return that; } But then I wondered... Am I being too cautious? Do I have to check if many == null? Is that ever possible in any current Java version? If so, how? If not, I'll probably keep checking, just for futureproofing in case Oracle decides it can be null one day.
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As Java cannot determine the type of literal null , you must explicitly inform the type of the literal null to Java. Failing to do so will result in an NullPointerException .
While using the varargs, you must follow some rules otherwise program code won't compile. The rules are as follows: There can be only one variable argument in the method. Variable argument (varargs) must be the last argument.
A method with variable length arguments(Varargs) in Java can have zero or multiple arguments.
Varargs are useful for any method that needs to deal with an indeterminate number of objects. One good example is String. format . The format string can accept any number of parameters, so you need a mechanism to pass in any number of objects.
I tried it with Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0 on Linux 3.5.0-21-generic
Using myMethod(null) doesn't pass new Object[]{null}, it passes null. Arrays are objects in Java and therefore null is valid for the type Object[].
Your nullcheck is, therefore, not overly cautious.
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