Passing directly an array initializer to a method parameter doesn’t work

by 
foo({1,2});

{1, 2} this kind of array initialization only work at the place you are declaring an array.. At other places, you have to create it using new keyword..

That is why: – 

Object[] obj = {1, 2};

Was fine..
This is because, the type of array, is implied by the type of reference we use on LHS.. But, while we use it somewhere else, Compiler cannot find out the type (Like in your case)..

Try using : –

  foo(new Object[]{1,2});

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