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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