java hashcode

1@Override
2public int hashCode() {
3    int hash = 7;
4    hash = 31 * hash + (int) id;
5    hash = 31 * hash + (name == null ? 0 : name.hashCode());
6    hash = 31 * hash + (email == null ? 0 : email.hashCode());
7    return hash;
8}

1import java.io.*;
2public class IB {
3 
4   public static void main(String args[]) {
5      String a = "100";
6      String b = "100";
7      if(a.equals(b))
8      {
9        System.out.println("Equal variables:");
10        System.out.println(a.hashCode() + "\n" + b.hashCode());
11      }
12      
13      String c = "100";
14      String d = "500";
15 
16      if(!c.equals(d))
17      {
18          System.out.println("\nUn-equal variables:");
19          System.out.println(c.hashCode() + "\n" + d.hashCode());
20      }
21      String Str = new String("We are learning hashCode in Java");
22      System.out.println("Hashcode for Str :" + Str.hashCode() );
23   }
24}