Vector removeElement() method in Java with Example
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 packageimport java.util.*;// Driver Codepublic 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 packageimport java.util.*;// Driver Codepublic 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).
