java面向函数编程简单应用

 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 import java.util.function.Predicate;
 import java.util.logging.Filter;

 public class 函数式接口 {

     public static void main(String[] args) {
         List<Apple> apples = Arrays.asList(new Apple("red", 10),
                 new Apple("green", 20), new Apple("red", 16));
         List<Apple> apples1 = filterApple(apples, apple -> (apple.color).equals("red") && apple.size>10);
         apples1.stream().forEach(System.out::print);
     }
     public static List<Apple> filterApple(List<Apple> list,Predicate<Apple> predicate){
         List<Apple> list1 = new ArrayList<>();
         for (Apple apple : list) {
             if(predicate.test(apple)){
                 list1.add(apple);
             }
         }
         return list1;
     }
 }

 class Apple {
     String color;
     int size;

     @Override
     public String toString() {
         return "Apple{" +
                 "color='" + color + '\'' +
                 ", size=" + size +
                 '}';
     }

     public Apple(String color, int size) {
         this.color = color;
         this.size = size;
     }

     public String getColor() {
         return color;
     }

     public void setColor(String color) {
         this.color = color;
     }

     public int getSize() {
         return size;
     }

     public void setSize(int size) {
         this.size = size;
     }
 }