java使用while或for遍历Collection对象，whilecollection,下面例子使用两种方法遍历

java使用while或for遍历Collection对象，whilecollection,下面例子使用两种方法遍历

下面例子使用两种方法遍历Collection接口：

import java.util.ArrayList;import java.util.Iterator;/** * * @author byrx.net */public class Main {    /**     * Example of iterating through a Collection object     */    public void iterateCollection() {        ArrayList<String> list = new ArrayList<String>();        list.add("Monday");        list.add("Tuesdag");        list.add("Wednesday");        list.add("Thursday");        list.add("Friday");        list.add("Saturday");        list.add("Sunday");        Iterator<String> iterator = null;        //Example 1:        iterator = list.iterator();        while (iterator.hasNext()) {            String element = iterator.next();            System.out.println(element);        }        //blank line        System.out.println();        //Example 2:        for (iterator = list.iterator(); iterator.hasNext(); ) {            String element = iterator.next();            System.out.println(element);        }        //blank line        System.out.println();        //Example 3:        for (String element : list) {            System.out.println(element);        }    }    /**     * @param args 命令行参数     */    public static void main(String[] args) {        new Main().iterateCollection();    }}

输入如下：

MondayTuesdagWednesdayThursdayFridaySaturdaySundayMondayTuesdagWednesdayThursdayFridaySaturdaySundayMondayTuesdagWednesdayThursdayFridaySaturdaySunday