This is an example of how to get the sub list of a Vector. The Vector API provides the subList(int fromIndex, int toIndex) method. Getting a Vector sub list implies that you should:
- Create a new Vector.
- Populate the vector with elements, with
add(E e)API method of Vector. - Invoke
subList(int fromIndex, int toIndex)method of Vector. The method returns a List object containing elements fromstartIndextoendIndex - 1of the original Vector. The sub List returned is backed by the original Vector. So any changes made to the sub list will also be reflected to the original Vector. To check if this is true remove an element from the sub list and check that it is removed from the original Vector also.
Let’s take a look at the code snippet that follows:
package com.javacodegeeks.snippets.core;
import java.util.Vector;
import java.util.List;
public class SubListVector {
public static void main(String[] args) {
// Create a Vector and populate it with elements
Vector vector = new Vector();
vector.add("element_1");
vector.add("element_2");
vector.add("element_3");
vector.add("element_4");
vector.add("element_5");
/*
Use the List subList(int startIndex, int endIndex) operation
to get a sub list of the original Vector. This method
returns an List object containing elements from startIndex
to endIndex - 1 of the original Vector
*/
List subList = vector.subList(1,3);
System.out.println("Elements in sub list :");
for(int i=0; i < subList.size() ; i++)
System.out.println(subList.get(i));
/*
Sub List returned is backed by original Vector. So any
changes made to sub list will also be reflected to the
original Vector. We will test that by removing an element
from the sub list and check that it is removed from the original
Vector also
*/
Object obj = vector.remove(0);
System.out.println(obj + " is removed from sub list");
System.out.println("Elements in Vector :");
for(int i=0; i < vector.size() ; i++)
System.out.println(vector.get(i));
}
}
Output:
Elements in sub list :
element_2
element_3
element_1 is removed from sub list
Elements in Vector :
element_2
element_3
element_4
element_5
This was an example of how to get the sub list of a Vector in Java.
