Comparable接口测试

在写某些程序的时候我们往往需要排序，特别是是对容器进行排序的时候，往往是很麻烦的，这时候我们就可以继承Comparable接口中的compareTo方法来进行排序。

实现代码

public  class ComparableTest implements Comparable<ComparableTest>{
	private int id;
	private String name;
	private int age;
	private String sex;
	

	public ComparableTest(int id, String name, int age, String sex) {
		super();
		this.id = id;
		this.name = name;
		this.age = age;
		this.sex = sex;
	}


	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Map<ComparableTest,String> map=new TreeMap<>();
		map.put(new ComparableTest(35,"张三",25,"男"),"123");
		map.put(new ComparableTest(25,"李四",20,"男"),"456");
		map.put(new ComparableTest(12,"王小花",18,"女"),"678");
		map.put(new ComparableTest(12,"李小四",14,"男"),"910");
	for(ComparableTest key:map.keySet()) {
		System.out.println(key+"---"+map.get(key));
	}
		
		
	}

@Override
public String toString() {
	// TODO Auto-generated method stub
	return "id:"+id+",name:"+name+",age:"+age+",sex:"+sex;
}
	@Override
	public int compareTo(ComparableTest o) {  //负数：小于，0：等于，正数：大于
		// TODO Auto-generated method stub
		if(this.id>o.id)
		return 1;
		else if(this.id<o.id)
			return -1;
		else if(this.age>o.age)
			return 1;
		else if(this.age<o.age)
			return -1;
		else
			return 0;
	}

}

运行结果

id:12,name:李小四,age:14,sex:男—910
id:12,name:王小花,age:18,sex:女—678
id:25,name:李四,age:20,sex:男—456
id:35,name:张三,age:25,sex:男—123