Java Vector remove() Method

Description

The Java Vector remove(int index) method is used to remove the element at the specified position in this Vector. It shifts any subsequent elements to the left (subtracts one from their indices).It also returns the element that was removed from the Vector.

Declaration

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

public E remove(int index)

Parameters

index − This is the index of the element to be removed.

Return Value

The method call returns the element that was removed.

Exception

ArrayIndexOutOfBoundsException − This exception is thrown if the index is out of range.

Java Vector remove(Object o) Method

Description

This remove(Object o) method is used to remove the first occurrence of the specified element in this Vector.If the Vector does not contain the element it remains unchanged.

Declaration

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

public boolean remove(Object o)

Parameters

o − This is the element to be removed from this Vector, if present.

Return Value

The method call returns true if the Vector contained the specified element.

Exception

NA

Remove an Element by Index of a Vector of Integer Example

The following example shows the usage of Java Vector remove(index) method. We're creating a Vector of Integers. We're adding couple of Integers to the Vector object using add() method calls per element. Vector size is printed, array is printed and using remove(index) method, an element is removed. Then size and array is printed again.

package com.tutorialspoint;

import java.util.Vector;

public class VectorDemo {
   public static void main(String[] args) {
      
      // create an empty vector
      Vector<Integer> vector = new Vector<>();

      // use add() method to add elements in the vector
      vector.add(20);
      vector.add(15);
      vector.add(30);
      vector.add(45);

      System.out.println("Size of vector: " + vector.size());
	  // let us print all the elements available in vector again
      System.out.println("Vector = " + vector);
      
      // Removes element at 3rd position
      vector.remove(2);

      System.out.println("Now, Size of vector: " + vector.size());
      
      // let us print all the elements available in vector again
      System.out.println("Vector = " + vector);
   }
}

Output

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

Size of vector: 4
Vector = [20, 15, 30, 45]
Now, Size of vector: 3
Vector = [20, 15, 45]

Remove an Element by Index of a Vector of String Example

The following example shows the usage of Java Vector remove(object) method. We're creating a Vector of String. We're adding couple of Strings to the Vector object using add() method calls per element. Vector size is printed, array is printed and using remove(object) method, an element is removed. Then size and array is printed again.

package com.tutorialspoint;

import java.util.Vector;

public class VectorDemo {
   public static void main(String[] args) {
      
      // create an empty vector
      Vector<String> vector = new Vector<>();

      // use add() method to add elements in the vector
      vector.add("A");
      vector.add("B");
      vector.add("C");
      vector.add("D");

      System.out.println("Size of vector: " + vector.size());
	  // let us print all the elements available in vector again
      System.out.println("Vector = " + vector);
      
      // Removes element B
      vector.remove("B");

      System.out.println("Now, Size of vector: " + vector.size());
      
      // let us print all the elements available in vector again
      System.out.println("Vector = " + vector);
   }
}

Output

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

Size of vector: 4
Vector = [A, B, C, D]
Now, Size of vector: 3
Vector = [A, C, D]

Remove an Element by Index of a Vector of Object Example

The following example shows the usage of Java Vector remove(index) method. We're creating a Vector of Student objects. We're adding couple of Students to the Vector object using add() method calls per element. Vector size is printed, array is printed and using remove(index) method, an element is removed. Then size and array is printed again.

package com.tutorialspoint;

import java.util.Vector;

public class VectorDemo {
   public static void main(String[] args) {
      
      // create an empty vector
      Vector<Student> vector = new Vector<>();

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

      System.out.println("Size of vector: " + vector.size());
	  // let us print all the elements available in vector again
      System.out.println("Vector = " + vector);
      
      // Removes element at 3rd position
      vector.remove(2);

      System.out.println("Now, Size of vector: " + vector.size());
      
      // let us print all the elements available in vector again
      System.out.println("Vector = " + vector);
   }
}
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 vector: 3
Vector = [[ 1, Julie ], [ 2, Robert ], [ 3, Adam ]]
Now, Size of vector: 2
Vector = [[ 1, Julie ], [ 2, Robert ]]
java_util_vector.htm
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