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If we do int[] b = {2, 4}; then we have an array called b, with length 2. From what I understand, the java compiler is implicity doing int[] b = new int[] {2, 4}; for me, fine.

Similarly, if we do int[] c = new int[2]; , then we get an array called c initialzed to {0, 0} My confusion comes from why the following doesn't work:

Why can't I do int[] d = new int[2] {5, 6};

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It's just a compiler thing. Besides, why would you want to manually input the size anyway? This will just be a source of error.

The int[] b = new int[] {2, 4} notation is for convenience, if you already know the contents of the array that you want to declare.

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+1 - Maybe to partially initialize an array while still giving it a larger size would be my only thought on why it might be helpful if it were actually possible.

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