Remove Vector elements

We can use remove() method of Vector to delete/remove elements from Vector

There are 7 different “remove” methods defined in Vector


1) Object remove(int index);
2) boolean remove(Object o);
3) boolean removeAll(Collection c);
4) boolean removeAllElements();
5) boolean removeElement(Object o);
6) void removeElementAt(int index);
7) protected void removeRange(int fromIndex, int toIndex);

Object remove(int index)

Removes the element at the specified position in the Vector.

Example :

  1. import java.util.*;
  2. public class VectorRemoveAtIndex {
  3.     public static void main(String[] args) {
  4.     Vector<String> vector = new Vector<String>();
  5.     vector.add("Java");
  6.         vector.add("c++");
  7.         vector.add("python");
  8.         vector.add("c");
  9.         System.out.println("Vector before removing elements");
  10.         System.out.println(vector);
  11.         Vector.remove(2);
  12.         System.out.println("Vector after removing elements");
  13.         System.out.println(vector);
  14.     }
  15. }
import java.util.*;
public class VectorRemoveAtIndex {
	public static void main(String[] args) {
	Vector<String> vector = new Vector<String>();
	vector.add("Java");
        vector.add("c++");
        vector.add("python");
        vector.add("c");
        System.out.println("Vector before removing elements");
        System.out.println(vector);
        Vector.remove(2);
        System.out.println("Vector after removing elements");
        System.out.println(vector);
	}
}
Note : We can see that element at index 2 in the Vector is removed

boolean remove(Object o)

Removes the first occurrence of the specified element from the Vector, if it is present.

Example :

  1. import java.util.*;
  2. public class VectorRemoveElement {
  3.     public static void main(String[] args) {
  4.     Vector<String> vector = new Vector<String>();
  5.     vector.add("java");
  6.         vector.add("c++");
  7.         vector.add("python");
  8.         vector.add("java");
  9.         System.out.println("Vector before removing elements");
  10.         System.out.println(vector);
  11.         Vector.remove("java");
  12.         System.out.println("Vector after removing elements");
  13.         System.out.println(vector);
  14.     }
  15. }
import java.util.*;
public class VectorRemoveElement {
	public static void main(String[] args) {
	Vector<String> vector = new Vector<String>();
	vector.add("java");
        vector.add("c++");
        vector.add("python");
        vector.add("java");
        System.out.println("Vector before removing elements");
        System.out.println(vector);
        Vector.remove("java");
        System.out.println("Vector after removing elements");
        System.out.println(vector);
	}
}
Note : We can see that , first occurance of element “java” is removed from the Vector

boolean removeAll(Collection c)

Removes from the Vector all of its elements that are contained in the specified collection.

Example :

  1. import java.util.*
  2. public class VectorRemoveAllElements {
  3.     public static void main(String[] args) {
  4.     Vector<String> vector1 = new Vector<String>();
  5.     vector1.add("java");
  6.         vector1.add("c++");
  7.         vector1.add("python");
  8.         vector1.add("c");
  9.         Vector<String> vector2 = new Vector<String>();
  10.         vector2.add("c++");
  11.         vector2.add("python");
  12.         System.out.println("Vector before removing elements");
  13.         System.out.println(vector2);
  14.         Vector1.removeAll(vector2);
  15.         System.out.println("Vector after removing elements");
  16.         System.out.println(vector1);
  17.     }
  18. }
import java.util.*
public class VectorRemoveAllElements {
	public static void main(String[] args) {
	Vector<String> vector1 = new Vector<String>();
	vector1.add("java");
        vector1.add("c++");
        vector1.add("python");
        vector1.add("c");
        Vector<String> vector2 = new Vector<String>();
        vector2.add("c++");
        vector2.add("python");
        System.out.println("Vector before removing elements");
        System.out.println(vector2);
        Vector1.removeAll(vector2);
        System.out.println("Vector after removing elements");
        System.out.println(vector1);
	}
}
Note : We can see that “removeAll()” method has removed all of its elements “c++” and “python” from the main 
            Vector

boolean removeAllElements()

Removes all elements from this vector and sets its size to zero

Example :

  1. import java.util.*;
  2. public class VectorRemoveAllElements {
  3.     public static void main(String[] args) {
  4.     Vector<String> vector = new Vector<String>();
  5.     vector.add("java");
  6.         vector.add("c++");
  7.         vector.add("python");
  8.         vector.add("java");
  9.         System.out.println("Vector before removing elements");
  10.         System.out.println(vector);
  11.         vector.removeAllElements();
  12.         System.out.println("Vector after removing elements");
  13.         System.out.println(vector);
  14.     }
  15. }
import java.util.*;
public class VectorRemoveAllElements {
	public static void main(String[] args) {
	Vector<String> vector = new Vector<String>();
	vector.add("java");
        vector.add("c++");
        vector.add("python");
        vector.add("java");
        System.out.println("Vector before removing elements");
        System.out.println(vector);
        vector.removeAllElements();
        System.out.println("Vector after removing elements");
        System.out.println(vector);
	}
}

boolean removeElement(Object o)

Removes the first (lowest-indexed) occurrence of the argument from this vector.

Example :

  1. import java.util.*;
  2. public class VectorRemoveElement {
  3.     public static void main(String[] args) {
  4.     Vector<String> vector = new Vector<String>();
  5.     vector.add("java");
  6.         vector.add("c++");
  7.         vector.add("python");
  8.         vector.add("java");
  9.         System.out.println("Vector before removing elements");
  10.         System.out.println(vector);
  11.         vector.removeElement("python");
  12.         System.out.println("Vector after removing elements");
  13.         System.out.println(vector);
  14.     }
  15. }
import java.util.*;
public class VectorRemoveElement {
	public static void main(String[] args) {
	Vector<String> vector = new Vector<String>();
	vector.add("java");
        vector.add("c++");
        vector.add("python");
        vector.add("java");
        System.out.println("Vector before removing elements");
        System.out.println(vector);
        vector.removeElement("python");
        System.out.println("Vector after removing elements");
        System.out.println(vector);
	}
}

void removeElementAt(int index)

Deletes the element at the specified index.

Example :

  1. import java.util.*;
  2. public class VectorRemoveElementAtIndex {
  3.     public static void main(String[] args) {
  4.     Vector<String> vector = new Vector<String>();
  5.     vector.add("java");
  6. vector.add("c++");
  7. vector.add("python");
  8. vector.add("java");
  9. System.out.println("Vector before removing elements");
  10. System.out.println(vector);
  11. vector.removeElementAt(2);
  12. System.out.println("Vector after removing elements");
  13. System.out.println(vector);
  14.     }
  15. }
import java.util.*;
public class VectorRemoveElementAtIndex {
	public static void main(String[] args) {
	Vector<String> vector = new Vector<String>();
	vector.add("java");
vector.add("c++");
vector.add("python");
vector.add("java");
System.out.println("Vector before removing elements");
System.out.println(vector);
vector.removeElementAt(2);
System.out.println("Vector after removing elements");
System.out.println(vector);
	}
}

protected void removeRange(int fromIndex, int toIndex)

Removes from this Vector all of the elements whose index is between fromIndex, inclusive, and toIndex, exclusive.

Note : removeRange(int, int) method is protected . 
           
           We can only invoke it from a subclass of Vector or from a class within the same package as Vector

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Raj
Founder of javainsimpleway.com
I love Java and open source technologies and very much passionate about software development.
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