Java Vector removeAllElements() Method

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Description

The Java Vector removeAllElements() method is used to remove all components from this vector and sets its size to zero. This method is identical in functionality to the clear method.

Declaration

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

public void removeAllElements()

Parameters

NA

Return Value

NA

Exception

NA

Removing All Elements of a Vector of Integer Example

The following example shows the usage of Java Vector removeAllElements() method to remove all elements of the vector. We're creating an Vector of Integers, adding some elements, print its size and then use removeAllElements() method to remove all elements. Lastly we've printed the new size of the vector to see if all elements are removed or not.

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);
      
      System.out.println("Size of the vector: "+vec.size());

      System.out.println("Removing all elements");
      
      // lets remove all the elements
      vec.removeAllElements();

      System.out.println("Now size of the vector: "+vec.size());      
   } 
}

Output

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

Size of the vector: 4
Removing all elements
Now size of the vector: 0

Removing All Elements of a Vector of String Example

The following example shows the usage of Java Vector removeAllElements() method to remove all elements of the vector. We're creating an Vector of Strings, adding some elements, print its size and then use removeAllElements() method to remove all elements. Lastly we've printed the new size of the vector to see if all elements are removed or not.

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("D");
      vec.add("C");
      vec.add("B");
      vec.add("A");
      
      System.out.println("Size of the vector: "+vec.size());

      System.out.println("Removing all elements");
      
      // lets remove all the elements
      vec.removeAllElements();

      System.out.println("Now size of the vector: "+vec.size());      
   } 
}

Output

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

Size of the vector: 4
Removing all elements
Now size of the vector: 0

Removing All Elements of a Vector of Student Example

The following example shows the usage of Java Vector removeAllElements() method to remove all elements of the vector. We're creating an Vector of Student objects, adding some elements, print its size and then use removeAllElements() method to remove all elements. Lastly we've printed the new size of the vector to see if all elements are removed or not.

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"));
      vec.add(new Student(4, "Jene"));
      
      System.out.println("Size of the vector: "+vec.size());

      System.out.println("Removing all elements");
      
      // lets remove all the elements
      vec.removeAllElements();

      System.out.println("Now size of the vector: "+vec.size());      
   } 
}
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 + " ]";
   }
   
   @Override
   public boolean equals(Object obj) {
      Student s = (Student)obj;
      return this.rollNo == s.rollNo && this.name.equalsIgnoreCase(s.name);
   }
} 

Output

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

Size of the vector: 4
Removing all elements
Now size of the vector: 0