Java的8个流得到嵌入对象

Question

我有myObjects

List<MyObject> myObjects 

名单，我将所有OtherObject的

class MyObject { 

    private OtherObject otherObject; 
} 

我简单的方法是：

myObjects.stream().?? 

，但我做的不知道如何获得嵌入对象

Answer 1

你在想的是这样的：myObjects.stream（）

import java.util.List; 
import java.util.ArrayList; 
public class HelloWorld{ 

    public static void main(String []args){ 
     List<MyObject> myObjects = new ArrayList<>(); 
     HelloWorld hw = new HelloWorld(); 
     myObjects.add(hw.new MyObject("Try")); 
     myObjects.add(hw.new MyObject("This")); 
     myObjects.stream() 
     .map(o -> o.getOtherObject().toUpperCase()) 
     .forEach(System.out::println); 

    } 

    class MyObject { 
     private String otherObject; 
     public MyObject(String s) { 
      this.otherObject = s; 
     } 
     public String getOtherObject() { 
      return otherObject; 
     } 
    } 

} 

Answer 2

添加消气剂MyObject和使用map

class MyObject { 

    private OtherObject otherObject; 

    public OtherObject getOtherObject() { 
     return otherObject; 
    } 
} 

... 
myObjects.stream().map(MyObject::getOtherObject).forEach(System.out::println)