package com.ven.java8.foreach;import java.util.ArrayList;import java.util.LinkedHashMap;import java.util.List;import java.util.Map;import com.ven.java8.method.references.CreateFactory;/** * 测试使用java8 操作List/Map * * @author xiaowen * */public class TestCollections { public static void main(String[] args) { // 操作Map部分 Map<String, Integer> items = new LinkedHashMap<>(); items.put("小白", 10); items.put("小文", 20); items.put("小君", 30); items.put("KD", 40); items.put("ws", 50); items.put("XJ", 60); for (Map.Entry<String, Integer> entry : items.entrySet()) { System.err.println("使用java8之前的版本/姓名 : " + entry.getKey() + " 分数 : " + entry.getValue()); } //java8版本 items.forEach((k,v)->{ System.err.println("使用java8循环 /姓名 : " +k + " 分数 : " + v); }); items.forEach((k,v)->{ if(k.equals("小文")){ System.out.println("hello "+k); } }); System.out.println("------华丽的分割线-----"); //操作List部分 List<User> itemsList = new ArrayList<>(); User user1 =CreateFactory.create(User::new); user1.setId("1"); user1.setUserName("xw"); user1.setAge("12"); itemsList.add(user1); User user2 =CreateFactory.create(User::new); user2.setId("2"); user2.setUserName("xj"); user2.setAge("23"); itemsList.add(user2); for(User item : itemsList){ System.out.println(item.getId()+"-"+item.getUserName()+"-"+item.getAge()); } System.out.println("------华丽的分割线-----"); //java8版本 itemsList.forEach(item->{ System.out.println(item.getUserName()); }); //条件过滤 itemsList.forEach(item->{ String userName = item.getUserName(); if(userName.equals("xj")){ System.out.println("大家好我是"+userName); } }); //方法的引用 itemsList.forEach(System.out::println); //stream and filter itemsList.stream().filter(itemuser->itemuser.getUserName().equals("xj")).forEach(item ->{ System.out.println("...........stream........"); System.err.println(item.getUserName()); }); }}附带User
package com.ven.java8.foreach;public class User { private String id; private String userName; private String age; public String getId() { return id; } public void setId(String id) { this.id = id; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public String getAge() { return age; } public void setAge(String age) { this.age = age; } }再分享一下我老师大神的人工智能教程吧。零基础！通俗易懂！风趣幽默！还带黄段子！希望你也加入到我们人工智能的队伍中来！https://blog.csdn.net/jiangjunshow