Uninitialized Object vs Object Initialized to NULL

Question

I\'m working in Java.

I commonly setup some objects as such:

public class Foo {
    private SomeObject someName;

    // do stuff

    public void so         


        

Answer 1

Correct, both static and instance members of reference type not explicitly initialized are set to null by Java. The same rule applies to array members.

From the Java Language Specification, section 4.12.5:

Initial Values of Variables

Every variable in a program must have a value before its value is used:

Each class variable, instance variable, or array component is initialized with a default value when it is created

[...] For all reference types, the default value is null.

Note that the above rule excludes local variables: they must be initialized explicitly, otherwise the program will not compile.