Java - Integer Class hashCode() Method

Integer class hashCode() method: Here, we are going to learn about the hashCode() method of Integer class with its syntax and example. By Preeti Jain Last updated : March 18, 2024

Integer class hashCode() method

hashCode() method is available in java.lang package.
hashCode() method is used to return hashcode of the Integer object.
hashCode() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
hashCode() method does not throw an exception at the time of returning hash code.

Syntax

public int hashCode();

Parameters

It does not accept any parameter.

Return Value

The return type of this method is int, it returns the hash code for this object.

Example

// Java program to demonstrate the example 
// of int hashCode() method of Integer class

public class HashCodeOfIntegerClass {
    public static void main(String[] args) {
        // Variables initialization
        int value1 = 30;
        int value2 = 10;

        // It returns hashcode value denoted by this Integer i1 object
        // by calling i1.hashCode()
        Integer i1 = new Integer(value1);

        // Display i1 result
        System.out.println("i1.hashCode(): " + i1.hashCode());

        // It returns hashcode value denoted by this Integer i2 object
        // by calling i2.hashCode()
        Integer i2 = new Integer(value2);

        // Display i2 result
        System.out.println("i2.hashCode(): " + i2.hashCode());
    }
}

Output

i1.hashCode(): 30
i2.hashCode(): 10

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