对象比较器：Comparable接口和Comparator接口

Comparable接口：

此接口强行对实现它的每个类的对象进行整体排序。这种排序被称为类的自然排序，类的comparaTo方法被称为它的自然比较方法

Comparator接口：

强行对某个对象collection进行整体排序的比较

实例：

创建两个类（Cat，Dog）

分别将Cat继承comparable，Dog继承comparatar

对两个或多个数据进行比较，以确定它们是否相等，或确定它们之间的大小关系及排列顺序

测试类

import java.util.Arrays;

public class test {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		int[] nums = {1,3,4,124,2,523,544,25};
		Arrays.sort(nums);//将数组排序
		System.out.println(Arrays.toString(nums));//输出数组
		
		String[] name={"xiaomin","tiantian","meomei"};
		Arrays.sort(name);
		System.out.println(Arrays.toString(name));
		
		Cat[] cats={new Cat("xiaoxiao",3),new Cat("xioawangba",4),new Cat("dadaguai",5)};
		Arrays.sort(cats);
		System.out.println(Arrays.toString(cats));
		
		Dog[] dogs={new Dog("xiaoxiao",3),new Dog("xioawangba",4),new Dog("dadaguai",5)};
		Arrays.sort(dogs,new Dog());
		System.out.println(Arrays.toString(dogs));
	
	}

}

子类Cat继承comparable

public class Cat implements Comparable{
	private String name;
	private int age;
	public Cat(){
		super();
	}
	public Cat(String name,int age){
		super();
		this.name=name;
		this.age=age;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	@Override
	public String toString() {
		return "Cat [name=" + name + ", age=" + age + "]";
	}
	
	@Override
	public int compareTo(Cat o) {
		// TODO Auto-generated method stub
		return this.age-o.age;
	}
	
}

子类Dog继承comparatar接口

import java.util.Comparator;

public class Dog implements Comparator{
	private String name;
	private int age;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	@Override
	public String toString() {
		return "Dog [name=" + name + ", age=" + age + "]";
	}
	public Dog(String name, int age) {
		super();
		this.name = name;
		this.age = age;
	}
	public Dog() {
		super();
		// TODO Auto-generated constructor stub
	}
	@Override
	public int compare(Dog arg0, Dog arg1) {
		// TODO Auto-generated method stub
		return arg0.getAge()-arg1.getAge();
	}
	
}