ArrayList示例，,package ques

ArrayList示例，,package ques

package questions;import java.util.*;/** * @author Bharat Verma */public class ArrayListDemo {    public static void printArrayList (ArrayList p_arraylist)    {        System.out.println("------------------------------------------");        System.out.println("Content of ArrayList : "+p_arraylist);        System.out.println("Size of ArrayList = "+p_arraylist.size());        System.out.println("------------------------------------------");    }    public static void main(String[] args)     {        ArrayList<Object> sampleArrayList =new ArrayList<Object>(); // you can specify the object type        Integer intr = new Integer(729);        String str ="Bharat";        double dtr = 169.721;        printArrayList(sampleArrayList);        sampleArrayList.add(intr);        sampleArrayList.add(str);        sampleArrayList.add(dtr);        printArrayList(sampleArrayList);        Integer i5=new Integer(50);        sampleArrayList.add(3, i5); // using add(int index, object obj)        printArrayList(sampleArrayList);        sampleArrayList.remove(3); // using remove()        printArrayList(sampleArrayList);        Object a=sampleArrayList.clone(); // using clone        System.out.println("The clone is: " + a);        printArrayList(sampleArrayList);        // iteration using iterator        Iterator iter = sampleArrayList.iterator();        System.out.println("Using Iterator");        while (iter.hasNext())        {            System.out.println(iter.next());        }        // using for loop and indexes         System.out.println("Using for loop and index");        for (int i=0; i<sampleArrayList.size(); i++)        {            System.out.println(sampleArrayList.get(i));        }    }}