【学习笔记】Java增强型for循环

package collection;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
@SuppressWarnings("all")
public class EnhanceFor {
    // 增强for底层是简化版的迭代器
    public static void main(String[] args) {
        List col = new ArrayList();
        col.add(new Book("西游记","吴承恩",44.6));
        col.add(new Book("红楼梦","曹雪芹",38.9));
        col.add(new Book("水浒传","罗贯中",66.6));
        Iterator it = col.iterator();
        while(it.hasNext())
            System.out.println(it.next());
        System.out.println("=================");
        //使用增强for迭代器 快捷键 I
        for(Object book : col){
            System.out.println(book);
        }

        //增强for遍历数组
        int[] nums = {1,4,7,3,2};
        for(int num : nums){
            System.out.print(num + " ");
        }
    }
}