Requirements:
去重List內(nèi)重復(fù)對(duì)象（此處重復(fù)定義與對(duì)象屬性值有關(guān)）

Achievement:
List Stream 對(duì)象調(diào)用distinct()方法，distinct()方法依賴(lài)hashCode()和equals()方法。
判斷兩個(gè)對(duì)象是否相同原理與HashMap定位key原理相同，先計(jì)算hashCode，如果hashCode相同繼續(xù)調(diào)用equals()方法。

List<Animal> animals = new ArrayList<>(Arrays.asList(new Animal("wangwang", 3),new Animal("wangwang", 3),new Animal("guagua", 2)) ); System.out.println(animals); System.out.println(animals.stream().distinct().collect(Collectors.toList()));

Console:

[Animal{name=‘wangwang’, age=3}, Animal{name=‘wangwang’, age=3}, Animal{name=‘guagua’, age=2}] [Animal{name=‘wangwang’, age=3}, Animal{name=‘guagua’, age=2}]

Animal Class：
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public class Animal {private String name;private Integer age;public Animal(String name, Integer age) {this.name = name;this.age = age;}@Overridepublic boolean equals(Object o) {if (this == o)return true;if (o == null || getClass() != o.getClass())return false;Animal animal = (Animal) o;return Objects.equals(name, animal.name) && Objects.equals(age, animal.age);}@Overridepublic int hashCode() {return Objects.hash(name, age);}@Overridepublic String toString() {return "Animal{" + "name='" + name + '\'' + ", age=" + age + '}';} }

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