Java Collection 的多种遍历操作

Java Collection 的多种遍历操作

package com.zhong.collection;

import javax.swing.plaf.IconUIResource;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

public class CollectionFor {
    public static void main(String[] args) {
        Collection<String> collection = new ArrayList<>();
        collection.add("小钟");
        collection.add("小王");
        collection.add("123");
        collection.add("abc");
        collection.add("ABC");
        System.out.println(collection);

        // 迭代器遍历
        System.out.println("-------------迭代器遍历-------------");
        Iterator<String> iterator = collection.iterator();
        while (iterator.hasNext()){
            String item = iterator.next();
            System.out.println(item);
        }

        // 增强 for 循环
        System.out.println("-------------增强 for 循环-------------");
        for (String item: collection) {
            System.out.println(item);
        }

        // lambda 表达式遍历
        System.out.println("-------------lambda 表达式遍历-------------");
        collection.forEach(System.out::println);
    }
}