Java - Boolean hashCode() method

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Description

The Java Boolean hashCode() returns a hash code for this Boolean object.

Declaration

Following is the declaration for java.lang.Boolean.hashCode() method

public int hashCode()

Overrides

hashCode in class Object

Parameters

NA

Return Value

This method returns the integer 1231 if this object represents true and the integer 1237 if this object represents false.

Exception

NA

Example 1

The following example shows the usage of Boolean hashCode() method for Boolean objects having true and false values respectively.

package com.tutorialspoint;
public class BooleanDemo {
   public static void main(String[] args) {

      // create 2 Boolean objects b1, b2
      Boolean b1, b2;

      // assign values to b1, b2
      b1 = Boolean.valueOf(true);
      b2 = Boolean.valueOf(false);

      // create 2 int primitives
      int i1, i2;

      // assign the hash code of b1, b2 to i1, i2
      i1 = b1.hashCode();
      i2 = b2.hashCode();

      String str1 = "Hash code of " + b1 + " is "  +i1;
      String str2 = "Hash code of " + b2 + " is "  +i2;

      // print i1, i2 values
      System.out.println( str1 );
      System.out.println( str2 );
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Hash code of true is 1231
Hash code of false is 1237

Example 2

The following example shows the usage of Boolean hashCode() method for primitive true and false values respectively.

package com.tutorialspoint;
public class BooleanDemo {
   public static void main(String[] args) {

      // create 2 Boolean objects b1, b2
      Boolean b1, b2;

      // assign values to b1, b2
      b1 = true;
      b2 = false;

      // create 2 int primitives
      int i1, i2;

      // assign the hash code of b1, b2 to i1, i2
      i1 = b1.hashCode();
      i2 = b2.hashCode();

      String str1 = "Hash code of " + b1 + " is "  +i1;
      String str2 = "Hash code of " + b2 + " is "  +i2;

      // print i1, i2 values
      System.out.println( str1 );
      System.out.println( str2 );
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Hash code of true is 1231
Hash code of false is 1237

Example 3

The following example shows the usage of Boolean hashCode() method for Boolean objects having true and false values respectively but created using different ways.

package com.tutorialspoint;
public class BooleanDemo {
   public static void main(String[] args) {

      // create 2 Boolean objects b1, b2
      Boolean b1, b2;

      // assign values to b1, b2
      b1 = Boolean.valueOf(true);
      b2 = new Boolean(false);

      // create 2 int primitives
      int i1, i2;

      // assign the hash code of b1, b2 to i1, i2
      i1 = b1.hashCode();
      i2 = b2.hashCode();

      String str1 = "Hash code of " + b1 + " is "  +i1;
      String str2 = "Hash code of " + b2 + " is "  +i2;

      // print i1, i2 values
      System.out.println( str1 );
      System.out.println( str2 );
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Hash code of true is 1231
Hash code of false is 1237