Vector removeElement() method in Java with Example

Last Updated : 24 May, 2023

The java.util.Vector.removeElement() method is used to remove first occurrence of particular object. If object is not found then it returns false else it returns true. If a particular object is present inside vector and removeElement() method call on that vector element then this method reduces vector size by 1.

Syntax:

public boolean removeElement(Object obj)

Parameters: This function accepts object as parameter which is to be removed.

Return Type: On Successful of deletion this function returns True otherwise this function returns False.

Exceptions: This method does not raise any exception.

Below programs illustrates the Vector.removeElement() function.

Program 1:

Java

// Java program to understand
// about vector.removeElement() function
 
// because vector is present in this package
import java.util.*;
 
// Driver Code
public class vector_demo {
    // main method begins here
    public static void main(String[] args)
    {
        // creating vector type object
        Vector<Integer> v
            = new Vector<Integer>();
 
        // inserting elements into the vector
        v.add(1);
        v.add(2);
        v.add(3);
        v.add(4);
        v.add(5);
        v.add(6);
 
        // printing vector before deleting element
        System.out.println("Before deleting");
        System.out.println("Vector: " + v);
        System.out.println("Size: " + v.size());
 
        System.out.println("\nAfter deleting");
 
        // trying to deleting object 3
        boolean flag = v.removeElement(3);
        if (flag) {
            System.out.println("Element '3' has been removed");
        }
        else {
            System.out.println("Element '3' is not present in Vector");
        }
 
        System.out.println("Vector: " + v);
        System.out.println("Size: " + v.size());
    }
}

Output:

Before deleting
Vector: [1, 2, 3, 4, 5, 6]
Size: 6

After deleting
Element '3' has been removed
Vector: [1, 2, 4, 5, 6]
Size: 5

Example 2:

Java

// Java program to understand
// about vector.removeElement() function
 
// because vector is present in this package
import java.util.*;
 
// Driver Code
public class vector_demo {
    // main method begins here
    public static void main(String[] args)
    {
        // creating vector type object
        Vector<Integer> v = new Vector<Integer>();
        // inserting elements into the vector
        v.add(1);
        v.add(2);
        v.add(3);
        v.add(4);
        v.add(5);
        v.add(6);
 
        // printing vector before deleting element
        System.out.println("Before deleting");
        System.out.println("Vector: " + v);
        System.out.println("Size: " + v.size());
 
        System.out.println("\nAfter deleting");
 
        // trying to deleting object 15
        boolean flag = v.removeElement(15);
 
        // since object 15 is not present flag will be false
        if (flag) {
            System.out.println("Element '15' has been removed");
        }
        else {
            System.out.println("Element '15' is not present in Vector");
        }
 
        System.out.println("Vector: " + v);
        System.out.println("Size: " + v.size());
    }
}

Output:

Before deleting
Vector: [1, 2, 3, 4, 5, 6]
Size: 6

After deleting
Element '15' is not present in Vector
Vector: [1, 2, 3, 4, 5, 6]
Size: 6

Time complexity: O(n). // n is the size of the vector.
Space complexity: O(1).

Vector removeElementAt() Method in Java

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