RetroSearch Browse

Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://www.geeksforgeeks.org/java/integer-hashcode-method-in-java/ below:

Integer hashCode() Method in Java

Last Updated : 05 Dec, 2018

The

java.lang.Integer.hashCode()

method of Integer class in Java is used to return the hash code for a particular Integer .

Syntax:

public int hashCode()

Parameters :

The method does not take any parameters.

Return Value:

The method returns a hash code integer value for

this

object, which is equal to the uncomplicated primitive integer value, represented by this Integer object. Below programs illustrate the use of hashCode() of Integer class:

Program 1:

When integer data type is passed.

java


 // Java program to demonstrate working
// of Java.lang.Integer.hashCode() Method
import java.lang.*;

public class Geeks {

    public static void main(String[] args)
    {
        // Object s_int created
        Integer s_int = new Integer("223");

        // Returning a hash code value for this object 
        int hashcodevalue = s_int.hashCode();
        System.out.println("Hash code Value for object = " + hashcodevalue);
    }
}

Output:

Hash code Value for object = 223

Program 2:

When String data type is passed.

Note:

This causes RuntimeErrors like

NumberFormatException java


 // Java program to demonstrate working
// of Java.lang.Integer.hashCode() Method
import java.lang.*;

public class Geeks {

    public static void main(String[] args)
    {
        // object s_int created
        Integer s_int = new Integer("gfg");

        // Returning a hash code value for this object.
        int hashcodevalue = s_int.hashCode();
        System.out.println("Hash code Value for object = " + hashcodevalue);
    }
}

Output:

Exception in thread "main" java.lang.NumberFormatException: For input string: "gfg"
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    at java.lang.Integer.parseInt(Integer.java:580)
    at java.lang.Integer.(Integer.java:867)
    at Geeks.main(Geeks.java:9)

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4