Array initialization differences java

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None at all – they’re just different ways of expressing the same thing.

The second form is only available in a variable declaration, however. For example, you cannot write:

foo.someMethod({x, y});

but you can write:

foo.someMethod(new SomeType[] { x, y });

The relevant bit of the Java language specification is section 10.6 – Array Initializers:

An array initializer may be specified in a declaration,
or as part of an array creation expression (ยง15.10), creating an array and providing some initial values:

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