Question

my code is

final int CONST_1 = 1010;
final int CONST_2 = 1011;

System.out.println("CONST_1 & CONST_2: " + Integer.toBinaryString(CONST_1 & CONST_2));
System.out.println("CONST_1 ^ CONST_2: " + Integer.toBinaryString(CONST_1 ^ CONST_2));
System.out.println("CONST_1 | CONST_2: " + Integer.toBinaryString(CONST_1 | CONST_2));
System.out.println("~CONST_1 : " + Integer.toBinaryString(~CONST_1));

Output is

CONST_1 & CONST_2: 1111110010
CONST_1 ^ CONST_2: 1
CONST_1 | CONST_2: 1111110011
~CONST_1 : 11111111111111111111110000001101

In my opinion it’s wrong and it should be:

CONST_1 & CONST_2: 1010
CONST_1 ^ CONST_2: 1
CONST_1 | CONST_2: 1011
~CONST_1 : 101

Please explain me why I have such result. Thanks!

Answer 1

Change this:

final int CONST_1 = 1010;
final int CONST_2 = 1011;

to this:

final int CONST_1 = 0b1010;
final int CONST_2 = 0b1011;

Don’t forget that literals are decimal by default. You clearly wanted them to be binary.

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Binary literals require Java 1.7. So if that’s not available, you can go with this:

final int CONST_1 = Integer.parseInt("1010",2);
final int CONST_2 = Integer.parseInt("1011",2);