Java Object hashCode() Method with Examples

by Online Tutorials Library July 22, 2022

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 : [email protected]

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 : [email protected]

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Java Object hashCode() Method with Examples

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Syntax

Returns

Example 1

Example 2

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