[Java基础]List集合子类特点

Posted 2021-06-23 Wecccccccc

ArrayList练习:

package test19;

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

public class ArrayListDemo {
    public static void main(String[] args)
    {
        ArrayList<String> array = new ArrayList<String>();

        array.add("hello");
        array.add("world");
        array.add("java");

        for (String s:array)
        {
            System.out.println(s);
        }

        Iterator<String> it = array.iterator();
        while(it.hasNext())
        {
            String s = it.next();
            System.out.println(s);
        }

        for (int i = 0;i<array.size();i++)
        {
            String s = array.get(i);
            System.out.println(s);
        }
    }

}

LinkedList练习:

package test19;

import java.util.Iterator;
import java.util.LinkedList;

public class LinkedListDemo {

    public static void main(String[] args)
    {
        LinkedList<String> llst = new LinkedList<String>();

        llst.add("hello");
        llst.add("world");
        llst.add("java");

        for (String s:llst)
        {
            System.out.println(s);
        }

        for (int i = 0;i<llst.size();i++)
        {
            String s = llst.get(i);
            System.out.println(s);
        }

        Iterator<String> it = llst.listIterator();

        while(it.hasNext())
        {
            String s = it.next();
            System.out.println(s);
        }

    }
}