Vector in Java

Vector is the pre-defined class provided by java for making heterogeneous list. Java introduce vector in ver5 and later. It is define under java.util package. Vector is like the dynamic array.

Methods of vector

addElement() Method

This adds a new value of any type in vector list.

Syntax

obj.addElement(value);

Example of addElement() Method in Java

Input Value

import java.util.Vector;  
    public class vectorg {    
    public static void main(String arg[]) {  
                
          Vector<Integer> a = new Vector<>(3);  
          a.add(25);  
          a.add(-35);  
          a.add(45);          
          System.out.println("Vector: "+a);            
          a.addElement(-65);   
          System.out.println("after vector: "+a);             
            }  
 
}

addElement() Method in Java

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Output Value

size() Method

This returns the size of the vector means how many elements in vector list

Syntax

obj.size(); 

Example of size() Method in Java

Input Value

import java.util.*;

public class vectorg {
	public static void main(String args[])
	{
		Vector<String> a = new Vector<String>();

		a.add("hello");
		a.add("basic");
		a.add("student");
		a.add("engineer");
		
		System.out.println("Vector: " + a);
		System.out.println("The size is: " + a.size());
	}
}

size() Method in Java

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Output Value

elementAt() Method

This return the given index position value of the vector list.

Syntax

obj.element(index);

Example of elementAt() Method in Java

Input Value

import java.util.*;

public class vectorg {
	public static void main(String args[])
	{
		Vector < String > colors = new Vector < String > ();  
          
          colors.add("Red");  
          colors.add("Blue");  
          colors.add("Yellow");  
          colors.add("gray");  
           
          System.out.println("Element position = " +colors.elementAt(1));  
          System.out.println("Element position = " +colors.elementAt(3));
	}
}

elementAt() Method in Java

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Output Value

insertElementAt() Method

This methods inserts the new item at specified position in vector list

Syntax

insertElementAt(item,pos);

Example of insertElementAt() Method in Java

Input Value

import java.util.*;

public class vectorg {
	public static void main(String args[])
	{  
        Vector<Integer> a = new Vector<>();   
        a.add(5);  
        a.add(10);  
        a.add(15);          
        a.add(20);  
        a.add(25);  
          
        System.out.println("before = "+a);    
        a.insertElementAt(40, 4);  
        System.out.println("after= "+a); 
	}
}

insertElementAt() Method in Java

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Output Value

removeElement() Method

This removes the given item element from Vector list.

Syntax

obj.removeElement(item);

Example of removeElement() Method in Java

Input Value

import java.util.*;

public class vectorg {
	public static void main(String args[])
	{          
               
        Vector < Integer > a = new Vector < > ();  
        a.add(5);  
        a.add(10);  
        a.add(15);  
        a.add(20);  
        a.add(25);  
        System.out.println("total Values: " +a);  
        System.out.println("Remove: "+a.remove((Integer)15));  
        System.out.println("vector: " +a);   
	}
}

removeElement() Method in Java

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Output Value

removeElementAt() Method

This removes the given position item from vector list.

Syntax

obj.removeElementAt(pos);

Example of removeElementAt() Method in Java

Input Value

import java.util.*;

public class vectorg {
	public static void main(String args[])
	{               
        Vector<String> a = new Vector<String>();
  
        a.add("5");
        a.add("10");
        a.add("15");
        a.add("20");
        a.add("25");
  
        System.out.println("Vector: " + a);
        System.out.println("size : " + a.size());

        a.removeElementAt(4);
        System.out.println("Final: " + a);
        System.out.println("size: " + a.size());  
	}
}

removeElementAt() Method in Java

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Output Value

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