ArrayList Operations

import java.util.*;
class Main{
    
    public static void main (String args[])
    {
        ArrayList<Integer> list1 = new ArrayList<Integer>();
        ArrayList<String> list2 = new ArrayList<String>(20);
        ArrayList<Integer> list3 = new ArrayList<Integer>(list1);
    
        
        list2.ensureCapacity(30); // increase the capacity of arraylist
    
        list1.add(20);
        list1.add(30);
        list1.add(40);
        list1.add(50);
        System.out.println(list1);  // to print total array
        System.out.println(list1.isEmpty()); // check if list is empy or not
        System.out.println(list1.contains(30)); // check the element is present or not
        System.out.println(list1.indexOf(20)); // 0 index
        System.out.println(list1.get(1)); //30 get perticular positon from array
        System.out.println(list1.set(1,222));  // replace 30 with 22
       list1.add(5,333); // add element at specific position , but only possible for last index plus 1
       list1.remove(3);  // remove element at specific positionm
       list1.remove(30); // remove specific elemnt from the list 
        list1.trimToSize();    /// trim arraylist to existing size
     Collections.reverse(list1);   /// reverse the array list
        //for connecting two array list
        list1.addAll(list2);  
    
    
         // conver arrya to array list
        String[] asset = {"equity", "stocks", "gold", "foreign exchange","fixed income", "futures", "options"}; 
        List<String> assetList = Arrays.asList(asset);

        //Converting list to an array
        Object [] array = list1.toArray();
        
        for(Object object : array)
        {
            System.out.println(object);
        }
    }
    
    
}




////////////////////////////////////////////////////////////////////////////////////////////
Array List Iterations

package test;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.ListIterator;

public class ArrayListLoopExample {

    public static void main(String args[]){
     
        //Creating Arraylist for loop example
        ArrayList<String> loopList = new ArrayList<String>();
     
        //Storing elements in Java Arraylist
        loopList.add("low cost personal loan");
        loopList.add("cheap personal loan");
        loopList.add("personal loan in 24 hours");
     
        //Loop Arraylist using foreach loop of JDK1.5
        System.out.println("=====================================================");
        System.out.println("ArrayList Loop Example using foreach loop of JDK 1.5");
        for(String element: loopList){
            System.out.println(element);
        }
     
        //Loop Arraylist using simple for loop and size method
        System.out.println("=====================================================");
        System.out.println("ArrayList Loop Example using for loop and size()");
        for(int i=0; i<loopList.size(); i++){
            System.out.println(loopList.get(i));
        }
     
        //Iterate Arraylist using iterator and while loop in Java
        System.out.println("=====================================================");
        System.out.println("ArrayList Loop Example using Iterator and while loop");
        Iterator<String> iterator = loopList.iterator();
        while(iterator.hasNext()){
            System.out.println(iterator.next());
        }
     
        //Iterate Arraylist using ListIterator and while loop in Java
        System.out.println("=====================================================");
        System.out.println("ArrayList Loop Example using ListIterator and while loop");
        ListIterator<String> listIterator = loopList.listIterator();
        while(listIterator.hasNext()){
            System.out.println(listIterator.next());
        }
    }
}