Java集合框架Collection(1)ArrayList的三种遍历方法

package com.company;

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

/**
 * Created by wangbin10 on 2017/3/1.
 */
public class JavaSort {
    public static void main(String [] args) {
        List<Integer> oldlist=new ArrayList<Integer>();
        for(int i=0;i<=9;i++){
            oldlist.add(i);
        }
//method1
        for(Integer i:oldlist){
            System.out.println(i);
        }
//method2
        for(int i=0;i<oldlist.size();i++){
            System.out.println(oldlist.get(i));
        }
//method3
        Iterator it=oldlist.iterator();
        while(it.hasNext()){
            System.out.println(it.next());
        }
    }
}