Use bitwise operator to create hash code : Bitwise Operators « Operators « Java Tutorial

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Java Tutorial » Operators » Bitwise Operators

3. 5. 21. Use bitwise operator to create hash code


public class Main {

  int instanceField;

  {

    int hc = hashCode();

    instanceField = hc;

    for (int i = 0; i < 32; i++) {

      System.out.print((hc & 0x80000000) != 0 ? '1' : '0');

      hc <<= 1;

    }

  }



  public static void main(String[] args) {

    System.out.println(new Main().instanceField);

    System.out.println(new Main().instanceField);

  }

}

3. 5. Bitwise Operators
	3. 5. 1.	The Bitwise Operators can be applied to the integer types, long, int, short, char, and byte.
	3. 5. 2.	The Bitwise Logical Operators
	3. 5. 3.	Bitwise AND (&)
	3. 5. 4.	Bitwise OR (\|)
	3. 5. 5.	Bitwise XOR (^)
	3. 5. 6.	Left shift (<<)
	3. 5. 7.	Bitwise complement (~): inverts ones and zeros in a number
	3. 5. 8.	Demonstrate the bitwise logical operators
	3. 5. 9.	All bitwise operators in action
	3. 5. 10.	Bitwise Operator Assignments
	3. 5. 11.	The Left Shift
	3. 5. 12.	Left shifting as a quick way to multiply by 2
	3. 5. 13.	The Right Shift
	3. 5. 14.	The Unsigned Right Shift
	3. 5. 15.	Signed shift to the right
	3. 5. 16.	Unsigned shifting a byte value.
	3. 5. 17.	Convert a number to negative and back
	3. 5. 18.	Performing Bitwise Operations on a Bit Vector
	3. 5. 19.	Converting Between a BitSet and a Byte Array
	3. 5. 20.	Returns a byte array of at least length 1
	3. 5. 21.	Use bitwise operator to create hash code
	3. 5. 22.	Operations on bit-mapped fields.
	3. 5. 23.	Represents a collection of 64 boolean (on/off) flags.

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