Java Boolean hashCode() Method

The hashCode() method of Boolean class returns the hash code for the specified Boolean object or the given Boolean value.

Syntax

1. public int hashCode()
2. public int hashCode(boolean value)

Parameters

The parameter ‘value’ represents the value to hash.

Overrides

The hashCode() method overrides hashcode in class object.

Return Value:

The hashCode () method returns a hash code value based on Boolean’s value.

• It returns 1231, if the Boolean’s value is true.
• It returns 1237, if the Boolean’s value is false.

Example 1

public class JavaBooleanHashCodeMethodExample1 {
    public static void main(String[] args) {
        Boolean b1 = true;
        //return the hash Code for true
        int val1 = b1.hashCode();
        System.out.println("1. Hash code of true = "+val1);
        Boolean b2 = false;
        int val2 = b2.hashCode();
        //print the hash code
        System.out.println("2. Hash code of false = "+val2);
    }
}

Output

1. Hash code of true = 1231
2. Hash code of false = 1237

Example 2

import java.util.Scanner;
public class JavaBooleanHashCodeMethodExample2 {
    public static void main(String[] args) {
        Scanner scanner= new Scanner(System.in);
        System.out.println("Are you above 18?");
        Boolean b1= scanner.nextBoolean();
        int val=b1.hashCode();
        if(val==1231){
            System.out.println("You are eligible.");
        }
        else{
            System.out.println("Sorry! You are not eligible");
        }
    }
}

Output

Are you above 18?
false
Sorry! You are not eligible

Example 3

public class JavaBooleanHashCodeMethodExample3 {
    public static void main(String[] args) {
        boolean b1 =true;
        //primitive data type's object cannot be used to call Boolean class methods
        int val1 = b1.hashCode();
        System.out.println("Hash code of true  = "+val1);
    }
}

Output

Error:(7, 22) java: boolean cannot be dereferenced

Example 4

public class JavaBooleanHashCodeMethodExample4 {
    static int i=1;
    public static void main(String[] args) {
        int val=Boolean.hashCode(true);
        System.out.println(i+ ". "+val);
        //for any value other than true it will return 1237 or false
        int val1=Boolean.hashCode(Boolean.parseBoolean("abc"));
        System.out.println(++i+ ". "+val1);
    }
}

Output

1. 1231
2. 1237