JavaSE-TreeSet练习

package com.btp.t4;

import java.util.Comparator;
import java.util.TreeSet;

import org.junit.Test;

public class TestEmployee {
	//自然排序：使Employee实现comparable接口，并按name排序
    @Test
    public void test1(){
    	Employee e1=new Employee("Kobe",37,new MyDate(4,12,1983));
    	Employee e2=new Employee("Lebulang",30,new MyDate(8,2,19782));
    	Employee e3=new Employee("Wade",17,new MyDate(3,1,1979));
    	Employee e4=new Employee("James",27,new MyDate(2,1,1975));
    	Employee e5=new Employee("Joradan",77,new MyDate(7,7,1933));
    	Employee e6=new Employee("Joradan",76,new MyDate(6,7,1933));
    	
    	TreeSet set=new TreeSet();
    	set.add(e1);//不实现cpmparable接口一个也不进去
    	set.add(e2);
    	set.add(e3);
    	set.add(e4);
    	set.add(e5);
    	set.add(e6);//进不去
    	
    	for(Object o:set){
    		System.out.println(o);
    	}
    }
    
    //定制排序:创建TreeSet时传入Comparator对象，按生日的先后排序
    @Test
    public void test2(){
    	Comparator com=new Comparator(){

			@Override
			public int compare(Object o1, Object o2) {
				if(o1 instanceof Employee && o2 instanceof Employee){
					Employee e1=(Employee)o1;
					Employee e2=(Employee)o2;
					MyDate birth1=e1.getBirthday();
					MyDate birth2=e2.getBirthday();
					if(birth1.getYear()!=birth2.getYear()){
						return birth1.getYear()-birth2.getYear();
					}else{
						if(birth1.getMonth()!=birth2.getMonth()){
							return birth1.getMonth()-birth2.getMonth();
						}else{
							return birth1.getDay()-birth2.getDay();
						}
					}
				}
				return 0;
			}
    	};
    	
    	TreeSet set=new TreeSet(com);
    	Employee e1=new Employee("Kobe",37,new MyDate(4,12,1983));
    	Employee e2=new Employee("Lebulang",30,new MyDate(8,2,1983));
    	Employee e3=new Employee("Wade",17,new MyDate(3,2,1983));
    	Employee e4=new Employee("James",27,new MyDate(2,1,1975));
    	Employee e5=new Employee("Joradan",77,new MyDate(7,7,1933));
    	Employee e6=new Employee("Joradan",76,new MyDate(7,7,1933));//生日相同进不去
    	set.add(e1);
    	set.add(e2);
    	set.add(e3);
    	set.add(e4);
    	set.add(e5);
    	set.add(e6);//进不去
    	for(Object o:set){
    		System.out.println(o);
    	}
    }
    
}










class Employee implements Comparable{
	private String name;
	private Integer age;
	private MyDate birthday;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	public MyDate getBirthday() {
		return birthday;
	}
	public void setBirthday(MyDate birthday) {
		this.birthday = birthday;
	}
	public Employee(String name, Integer age, MyDate birthday) {
		super();
		this.name = name;
		this.age = age;
		this.birthday = birthday;
	}
	public Employee() {
		super();
		// TODO 自动生成的构造函数存根
	}
	@Override
	public String toString() {
		return "Employee [name=" + name + ", age=" + age + ", birthday=" + birthday + "]";
	}
	//重写的comparaTo方法
	@Override
	public int compareTo(Object o) {
		if(o instanceof Employee){
			Employee p=(Employee)o;
			return this.name.compareTo(p.name);
		}
		return 0;
	}
	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((age == null) ? 0 : age.hashCode());
		result = prime * result + ((birthday == null) ? 0 : birthday.hashCode());
		result = prime * result + ((name == null) ? 0 : name.hashCode());
		return result;
	}
	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		Employee other = (Employee) obj;
		if (age == null) {
			if (other.age != null)
				return false;
		} else if (!age.equals(other.age))
			return false;
		if (birthday == null) {
			if (other.birthday != null)
				return false;
		} else if (!birthday.equals(other.birthday))
			return false;
		if (name == null) {
			if (other.name != null)
				return false;
		} else if (!name.equals(other.name))
			return false;
		return true;
	}
	
}





class MyDate{
	private int year;
	private int month;
	private int day;
	public int getYear() {
		return year;
	}
	public void setYear(int year) {
		this.year = year;
	}
	public int getMonth() {
		return month;
	}
	public void setMonth(int month) {
		this.month = month;
	}
	public int getDay() {
		return day;
	}
	public void setDay(int day) {
		this.day = day;
	}
	public MyDate(int day,int month,int year) {
		super();
		this.year = year;
		this.month = month;
		this.day = day;
	}
	public MyDate() {
		super();
		// TODO 自动生成的构造函数存根
	}
	@Override
	public String toString() {
		return "MyDate [year=" + year + ", month=" + month + ", day=" + day + "]";
	}
	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + day;
		result = prime * result + month;
		result = prime * result + year;
		return result;
	}
	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		MyDate other = (MyDate) obj;
		if (day != other.day)
			return false;
		if (month != other.month)
			return false;
		if (year != other.year)
			return false;
		return true;
	}
	
	
}