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Java - how to get int max and min value with bitwise operations?

2 points
Created by:
Kate_C
2895

Short solution:

int MAX_VALUE = -1 >>> 1;
int MIN_VALUE = -1 << 31;

System.out.println(MAX_VALUE); //  2147483647
System.out.println(MIN_VALUE); // -2147483648

Other short solution:

int MAX_VALUE = ~0 >>> 1;
int MIN_VALUE = ~MAX_VALUE;

System.out.println(MAX_VALUE); //  2147483647
System.out.println(MIN_VALUE); // -2147483648

1. Using bit shift operators

public class Example1 {

    public static void main(String[] args) {

        int MAX_VALUE = -1 >>> 1;
        int MIN_VALUE = -1 << 31;

        System.out.println(MAX_VALUE); //  2147483647
        System.out.println(MIN_VALUE); // -2147483648

        // 01111111111111111111111111111111
        System.out.println( toBinaryWithLeadingZeros(MAX_VALUE) );

        // 10000000000000000000000000000000
        System.out.println( toBinaryWithLeadingZeros(MIN_VALUE) );
    }
    
    private static String toBinaryWithLeadingZeros(int MAX_VALUE) {
        String binaryString = Integer.toBinaryString(MAX_VALUE);
        return String.format("%32s", binaryString).replace(' ', '0');
    }
}

2. Using bit shift and NOT operators

public class Example2 {

    public static void main(String[] args) {

        int MAX_VALUE = ~0 >>> 1;
        int MIN_VALUE = ~MAX_VALUE;

        System.out.println(MAX_VALUE); //  2147483647
        System.out.println(MIN_VALUE); // -2147483648

        // 01111111111111111111111111111111
        System.out.println( toBinaryWithLeadingZeros(MAX_VALUE) );

        // 10000000000000000000000000000000
        System.out.println( toBinaryWithLeadingZeros(MIN_VALUE) );
    }

    private static String toBinaryWithLeadingZeros(int MAX_VALUE) {
        String binaryString = Integer.toBinaryString(MAX_VALUE);
        return String.format("%32s", binaryString).replace(' ', '0');
    }
}

3. Stanrad way of getting Integer MAX and MIN value in java

public class Example3 {

    public static void main(String[] args) {

        System.out.println( Integer.MAX_VALUE ); //  2147483647
        System.out.println( Integer.MIN_VALUE ); // -2147483648
    }
}

 

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