Commit 0366f87
Lines changed: 87 additions & 0 deletions
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| 1 | + package com.brianway.learning.java8.lambda; | ||
| 2 | + | ||
| 3 | + import java.util.ArrayList; | ||
| 4 | + import java.util.Arrays; | ||
| 5 | + import java.util.List; | ||
| 6 | + import java.util.function.BiFunction; | ||
| 7 | + import java.util.function.Function; | ||
| 8 | + import java.util.function.Supplier; | ||
| 9 | + | ||
| 10 | + /** | ||
| 11 | + * Created by brian on 17/2/28. | ||
| 12 | + * 构造函数引用 | ||
| 13 | + */ | ||
| 14 | + public class ConstructorReference { | ||
| 15 | + | ||
| 16 | + public static void main(String[] args) { | ||
| 17 | + //Apple()的构造函数 | ||
| 18 | + Supplier<Apple> c1 = Apple::new; | ||
| 19 | + Apple a1 = c1.get(); | ||
| 20 | + System.out.println(a1); | ||
| 21 | + | ||
| 22 | + //Apple(int weight)的构造函数 | ||
| 23 | + Function<Integer, Apple> c2 = Apple::new; | ||
| 24 | + Apple a2 = c2.apply(110); | ||
| 25 | + System.out.println(a2); | ||
| 26 | + | ||
| 27 | + List<Integer> weights = Arrays.asList(7, 3, 4, 10); | ||
| 28 | + List<Apple> apples = map(weights, Apple::new); | ||
| 29 | + System.out.println("list of weights:"); | ||
| 30 | + apples.stream().forEach(System.out::println); | ||
| 31 | + | ||
| 32 | + //Apple(int weight, String color)的构造函数 | ||
| 33 | + BiFunction<String, Integer, Apple> c3 = Apple::new; | ||
| 34 | + Apple a3 = c3.apply("green", 110); | ||
| 35 | + System.out.println(a3); | ||
| 36 | + } | ||
| 37 | + | ||
| 38 | + public static List<Apple> map(List<Integer> list, | ||
| 39 | + Function<Integer, Apple> f) { | ||
| 40 | + List<Apple> result = new ArrayList<>(); | ||
| 41 | + //TODO | ||
| 42 | + for (Integer e : list) { | ||
| 43 | + result.add(f.apply(e)); | ||
| 44 | + } | ||
| 45 | + return result; | ||
| 46 | + } | ||
| 47 | + | ||
| 48 | + public static class Apple { | ||
| 49 | + private int weight = 0; | ||
| 50 | + private String color = ""; | ||
| 51 | + | ||
| 52 | + public Apple() { | ||
| 53 | + } | ||
| 54 | + | ||
| 55 | + public Apple(int weight) { | ||
| 56 | + this.weight = weight; | ||
| 57 | + } | ||
| 58 | + | ||
| 59 | + public Apple(String color, int weight) { | ||
| 60 | + this.weight = weight; | ||
| 61 | + this.color = color; | ||
| 62 | + } | ||
| 63 | + | ||
| 64 | + public Integer getWeight() { | ||
| 65 | + return weight; | ||
| 66 | + } | ||
| 67 | + | ||
| 68 | + public void setWeight(Integer weight) { | ||
| 69 | + this.weight = weight; | ||
| 70 | + } | ||
| 71 | + | ||
| 72 | + public String getColor() { | ||
| 73 | + return color; | ||
| 74 | + } | ||
| 75 | + | ||
| 76 | + public void setColor(String color) { | ||
| 77 | + this.color = color; | ||
| 78 | + } | ||
| 79 | + | ||
| 80 | + public String toString() { | ||
| 81 | + return "Apple{" + | ||
| 82 | + "color='" + color + '\'' + | ||
| 83 | + ", weight=" + weight + | ||
| 84 | + '}'; | ||
| 85 | + } | ||
| 86 | + } | ||
| 87 | + } | ||
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