Java String hashCode() method

Java String hashCode() method returns hash code for current String.

hash code for string object is computed as

s[0]*31^(n - 1) + s[1]*31^(n - 2) + ... + s[n - 1]

Using int arithmetic, where s[i] is the i^th character of the string, n is the length of the string, and ^ indicates exponentiation. (The hash value of the empty string is zero.)

Syntax:

public int hashCode()

Return: an int datatype i.e. hashcode of the String.

Java String hashCode() example 1:

public class JavaStringHashCodeEx1
{
    public static void main(String[] args) {
        String s1 = "tutorialandexample.com";
        System.out.println("Hash Code:" + s1.hashCode());
    }
}

Output:

Hash Code:1997172644

Java String hashCode() example 2: Two String having same hash code

public class JavaStringHashCodeEx2
{
    public static void main(String[] args)
{
        String s1 = "tutorialandexample.com";
        String s2 = "tutorialandexample.com";
        System.out.println("Hash Code:" + s1.hashCode());
         System.out.println("Hash Code:" + s2.hashCode());
    }
}

Output:

Hash Code:1997172644
Hash Code:1997172644

Java String hashCode() example 3:

public class JavaStringHashCodeEx3
{
    public static void main(String[] args) {
        String s1 = "tutorialandexample.com";
        String s2 = "tutorialandexample.com";
        if((s1.hashCode())==(s2.hashCode())){
            System.out.println("welcome to tutorialandexample.com by Roy Nitish Nk");
        }else{
            System.out.println("Tutorial by Nk");
        }
    }
}

Output:

welcome to tutorialandexample.com by Roy Nitish Nk

Java String hashCode() example 4:

public class JavaStringHashCodeEx4
 {
    public static void main(String[] args) {
        String s1 = "tutorialandexample.com";
        String s2 = "tutorialandexample.com";       
        if((s1.hashCode())==(s2.hashCode())){
            int i,j,k;
         for(i=1; i<=5; i++)
          {
              for(j=4; j>=i; j--)
              {
                  System.out.print(" ");
              }
                    for(k=1; k<=(2*i-1); k++)
                       {
System.out.print("Nitish");//comment this for print star
System.out.print("*");
}
System.out.println("");
}
        }else{
            System.out.println("Tutorial by Nk");
        }
    }
}

Output:

Nitish*
Nitish*Nitish*Nitish*
Nitish*Nitish*Nitish*Nitish*Nitish*
Nitish*Nitish*Nitish*Nitish*Nitish*Nitish*Nitish*
Nitish*Nitish*Nitish*Nitish*Nitish*Nitish*Nitish*Nitish*Nitish*