effective_46_foreach循环优先于传统的for循环

foreach可以遍历iterable接口
foreach循环在简洁性与预防bug方面有着传统的for循环无法比拟的优势.

除了一下情况:

过滤- 将删除特定元素remove方法
转换- 使用列表迭代器或者数组索引，以便设定元素的值
平行迭代- 如果并行遍历多个集合，就需要显示的控制迭代器和索引变量

package book.effectiveJava;

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

/**
 * for-each循环优先于传统的for循环
 * */
public class e_46PreferForeach {

	public static void main(String[] args) throws Exception {

		iteratorReplaceEle();

		iteratorNextMethod();

	}

	private static void iteratorReplaceEle() {
		List<String> ele =new ArrayList<>();
		ele.add("1");
		ele.add("2");
		for(Iterator<String> iterator = ele.iterator();iterator.hasNext();){
			String num = iterator.next();
			if(num.equalsIgnoreCase("2")){
				iterator.remove();
			}
			System.out.println(num);
		}
		System.out.println("iteratorReplaceEle "+ele.size());
	}

	private static void iteratorNextMethod() throws Exception {
		List<String> list =new ArrayList<>();
		list.add("1");
		list.add("2");
		list.add("3");

		Iterator<String> iterator =list.iterator();

		System.out.println(iterator.next());
		Thread.sleep(1000);
		System.out.println(iterator.next());
		Thread.sleep(1000);
		System.out.println(iterator.next());

		Thread.sleep(1000);
		System.out.println(iterator.next());
	}
}