JAVA QUESTIONS

Differencre between ArrayList and Vector List?

·         ArrayList and Vector both having same data structure internally, which is Array

·         Vector is by default synchronized, means at a time only one thread can access its methods from out side, where as ArrayList is non-synchronized means N number of threads can access at a time

·         But we can make ArrayList as synchronized by using Collections class, see it bellow

·         Both Vector and ArrayList  have capability to re-size dynamically, means Vector will Doubles the size of its array when its size increased, but ArrayList increased by Half only

How to Sort a Array List in Java?

import java.util.ArrayList;

import java.util.Collections;

public class SortingArrayList {

     public static void main(String args[]){

        ArrayList<String> al = new ArrayList<String> ();

             al.add("sai");

            al.add("sri");

            al.add("arun");

            al.add("john");

            al.add("babu");

            al.add("athish");

             System.out.println("Printing List before sorting......");

             for(String value: al){

                 System.out.println(value);

             }   Collections.sort(al);

              System.out.println("Printing List after sorting......");

             for(String value: al){

                System.out.println(value);

             }

}

}

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