Java Object hashCode() Method

hashCode() is the method of Object class. This method returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by HashMap.

Syntax

Returns

It returns a hash code value for this object.

Example 1

public class JavaObjectHashcodeExample1 {
    static int last_roll = 100;  
    int roll_no; 
    // Constructor 
    JavaObjectHashcodeExample1() 
    { 
        roll_no = last_roll; 
        last_roll++; 
    } 
    public int hashCode() 
    { 
        return roll_no; 
    } 
    // Driver code 
    public static void main(String args[]) 
    { 
        JavaObjectHashcodeExample1 s = new JavaObjectHashcodeExample1(); 
        // Below two statements are equivalent 
        System.out.println("HashCode : "+s); 
    } 
}

Test it Now

Output:

HashCode : JavaObjectHashcodeExample1@64

Example 2

public class JavaObjectHashcodeExample2 {
    static int max_sale_prize = 100;  
    int sale; 
    // Constructor 
    JavaObjectHashcodeExample2() 
    { 
        sale = max_sale_prize; 
        max_sale_prize++; 
    } 
    public int hashCode() 
    { 
        return max_sale_prize; 
    } 
    // Driver code 
    public static void main(String args[]) 
    { 
        JavaObjectHashcodeExample2 obj = new JavaObjectHashcodeExample2(); 
        // Below two statements are equivalent 
        System.out.println("HashCode : "+obj); 
    } 
}

Test it Now

Output:

HashCode : JavaObjectHashcodeExample2@65

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Java Object class