Unsigned right shift operator in Java

Question

As far as I know, the unsigned right shift operator inserts a 0 in the leftmost. Below is the code I’ve:

System.out.println(Integer.toBinaryString(-1>>>30))

Output: 11

But when I do the below: 

System.out.println(Integer.toBinaryString(-1>>>32))

Output: 11111111111111111111111111111111

Can anyone tell me why it’s not zero?

Answer 1

See this documentation here. 

When the right-hand operand was subjected to a bitwise logical AND operator & (§15.22.1) with the mask value 0x1f (0b11111). The shift distance is in the range 0 to 31, inclusive.

Here -1 >>> 32 is equivalent to -1 >>> 0 and -1 >>> 33 is equivalent to -1 >>> 1 and, -1 >>> -1 is equivalent to -1 >>> 31

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