Java Vector removeElement() Method

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Description

The Java Vector removeElement(Collection<?> c) is used to removes the first (lowest-indexed) occurrence of the argument from this vector. If the object is found in this vector, each component in the vector with an index greater or equal to the object's index is shifted downward to have an index one smaller than the value it had previously.

Declaration

Following is the declaration for java.util.Vector.removeElement(Object obj) method

public boolean removeElement​(Object obj)

Parameters

obj − This is the component to be removed.

Return Value

The method call returns true if the argument was a component of this vector; false otherwise.

Exception

NA.

Removing a Particular Element of a Vector of Integer Example

The following example shows the usage of Java Vector removeElement(object) method. We're creating a Vector of Integer. We're adding couple of Integer to the Vector object using add() method calls per element. Vector size is printed, array is printed and using removeElement(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<Integer> vector = new Vector<>();

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

      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 3
      vector.removeElement(3);

      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 = [1, 2, 3, 4]
Now, Size of vector: 3
Vector = [1, 2, 4]

Removing a Particular Element of a Vector of String Example

The following example shows the usage of Java Vector removeElement(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 removeElement(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.removeElement("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]

Removing a Particular Element of a Vector of Object Example

The following example shows the usage of Java Vector removeElement(object) method. We're creating a Vector of Student objects. We're adding couple of Student objects to the Vector object using add() method calls per element. Vector size is printed, array is printed and using removeElement(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<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 Adam
      vector.removeElement(new Student(3, "Adam"));

      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 ]]