Java Vector hashCode() Method

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Description

The Java Vector hashCode() method is used to return the hash code value for this Vector.

Declaration

Following is the declaration for java.util.Vector.hashCode() method

public int hashCode()

Parameters

NA

Return Value

The method call returns the hash code value(int) for this list.

Exception

NA

Getting hashcode of a Vector of Integer Example

The following example shows the usage of Java Vector hashCode() method to get the hashcode of this vector. We're adding couple of Integers to the Vector object using add() method calls per element and using hashCode() method, we're getting hash code and printing it.

package com.tutorialspoint;

import java.util.Vector;

public class VectorDemo {
   public static void main(String[] args) {

      // create an empty Vector vec with an initial capacity of 4      
      Vector<Integer> vec = new Vector<>(4);

      // use add() method to add elements in the vector
      vec.add(4);
      vec.add(3);
      vec.add(2);
      vec.add(1);

      // let us get the hashcode of the vector
      System.out.println("Hash code: "+vec.hashCode());
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Hash code: 1045631

Getting hashcode of a Vector of String Example

The following example shows the usage of Java Vector hashCode() method to get the hashcode of this vector. We're adding couple of Strings to the Vector object using add() method calls per element and using hashCode() method, we're getting hash code and printing it.

package com.tutorialspoint;

import java.util.Vector;

public class VectorDemo {
   public static void main(String[] args) {

      // create an empty Vector vec with an initial capacity of 4      
      Vector<String> vec = new Vector<>(4);

      // use add() method to add elements in the vector
      vec.add("Welcome");
      vec.add("To");
      vec.add("Tutorialspoint");

      // let us get the hashcode of the vector
      System.out.println("Hash code: "+vec.hashCode());
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Hash code: -1700837919

Getting hashcode of a Vector of Object Example

The following example shows the usage of Java Vector hashCode() method to get the hashcode of this vector. We're adding couple of Student objects to the Vector object using add() method calls per element and using hashCode() method, we're getting hash code and printing it.

package com.tutorialspoint;

import java.util.Vector;

public class VectorDemo {
   public static void main(String[] args) {

      // create an empty Vector vec with an initial capacity of 4      
      Vector<Student> vec = new Vector<>(4);

      // use add() method to add elements in the vector
      vec.add(new Student(1, "Julie"));
      vec.add(new Student(2, "Robert"));
      vec.add(new Student(3, "Adam"));

      // let us get the hashcode of the vector
      System.out.println("Hash code: "+vec.hashCode());
   }
}
class Student {
   int rollNo;
   String name;

   Student(int rollNo, String name){
      this.rollNo = rollNo;
      this.name = name;
   }

   @Override
   public String toString() {
      return "[ " + this.rollNo + ", " + this.name + " ]";
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Hash code: 1143597102