【Java基础】Arrays.sort()使用示例

狗有名字、体重和年龄3个属性：

public class Dog {
    public String name;		//名字
    public double weight;	//体重
    public int age;			//年龄
}

根据狗的年龄（age）排升序： Arrays.sort(dogs,(dog1,dog2)->dog1.age-dog2.age)

public static void main(String[] args) {
        Dog[] dogs = new Dog[]{new Dog("嘟嘟",10.0,3),new Dog("毛毛",5.0,8),
                new Dog("豆豆",12.0,2)};
        Arrays.sort(dogs,(dog1,dog2)->dog1.age-dog2.age);
        for (Dog dog : dogs) {
            System.out.println(dog.toString());
        }
    }

根据狗的体重（weight）排降序： Arrays.sort(dogs,(dog1,dog2)-> (int) (dog2.weight-dog1.weight))

public static void main(String[] args) {
        Dog[] dogs = new Dog[]{new Dog("嘟嘟",10.0,3),new Dog("毛毛",5.0,8),
                new Dog("豆豆",12.0,2)};
        Arrays.sort(dogs,(dog1,dog2)-> (int) (dog2.weight-dog1.weight));
        for (Dog dog : dogs) {
            System.out.println(dog.toString());
        }
    }