实现Comparable接口意义
进行对象间的比较排序等
(如果要进行id的从小到大的排序则看下面的compareTo方法)
对象数组初始化
利用花括号表达
package 数组.compareTo; import java.util.Arrays; public class Dog { public static void main(String[] args) { Cat[] cat = { new Cat(3, 5, "男"), new Cat(1, 11, "女"), new Cat(4, 15, "男"), new Cat(2, 51, "女") }; System.out.println("无排序前\t"+Arrays.toString(cat)); Arrays.sort(cat); System.out.println("有排序前\t"+Arrays.toString(cat)); } } class Cat implements Comparable { private int id; private int age; private String sex; public int getId() { return id; } public void setId(int id) { this.id = id; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } @Override public String toString() { return "Cat{" + "id=" + id + ", age=" + age + ", sex='" + sex + '\'' + '}'; } public Cat() { } public Cat(int id, int age, String sex) { this.id = id; this.age = age; this.sex = sex; } @Override public int compareTo(Object o) { Cat cat = (Cat) o; if (cat.id > this.id) { return -1; } if (cat.id < this.id) { return 1; } return 0; } }
compareTo的实现模板
实现该接口的目的是比较该多个对象的按id从小到大的顺序输出
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