二维数组的foreach遍历和三种集合的遍历

package com.skiff.www.base.grammar;


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

/**
 * @Auther: 一叶扁舟
 * @Date: 2018/12/22 14:31
 * @Description:采用foreach遍历二维数组和集合的遍历方式
 */
public class ForEach2Array {
    public static void main(String[] args) {
        int[][] arr = {{1,2,7,9},{2,4},{5,1,4}};

        for (int[] row : arr) {
            for (int element :row) {
                System.out.println(element);
            }
        }

        List<String> list = new ArrayList<>();
        list.add("wuhui");
        list.add("skiff");
        list.add("一叶扁舟");
        System.out.println("==================数组遍历的三种方式:1");
        for (int i = 0; i < list.size(); i++){
            System.out.println(list.get(i));
        }
        System.out.println("==================数组遍历的三种方式:2");
        for (Iterator<String> it = list.iterator(); it.hasNext(); ){
            System.out.println(it.next());
        }

        System.out.println("==================数组遍历的三种方式:3");
        for (String str :list) {
            System.out.println(str);
        }

    }
}