simple application using arraylist methods

// simple application using arraylist methods

package collection;

import java.util.ArrayList;

public class UseArrayListMethods {
    public static void main(String[] args) 
    {
    ArrayList a1=new ArrayList();
    System.out.println("Initial size of al:"+a1.size());

    a1.add("J");
    a1.add("A");
    a1.add("V");
    a1.add("A");
    a1.add("P");
    a1.add("O");
    a1.add("I");
    a1.add("N");
    a1.add("T");

    System.out.println("size After additions:"+a1.size());
    System.out.println("Contents of al:"+a1);
    
    a1.remove("J");
    a1.remove(2);
    a1.trimToSize();

    System.out.println("size After deletions:"+a1.size());
    System.out.println("contants of a1:"+a1);
    
    a1.add(0,"J");
    a1.add(3,"A");
    
    System.out.println("size After additions:"+a1.size());
    System.out.println("Contents of al:"+a1);
    Object ia[]=a1.toArray();
    String str="";
    for(int i=0;i<ia.length;i++)
    str+=ia[i];
    System.out.println(str);
    }
}


output:
Initial size of al:0
size After additions:9
Contents of al:[J, A, V, A, P, O, I, N, T]
size After deletions:7
contants of a1:[A, V, P, O, I, N, T]
size After additions:9
Contents of al:[J, A, V, A, P, O, I, N, T]
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