TreeSet类

package ListInterface;

import List.Person;
import org.junit.Test;

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

public class TreeSetTest {



    @Test
    public void test1(){
        TreeSet set = new TreeSet();

//        失败：不能添加不同类的对象
//        set.add(123);
//        set.add(456);
//        set.add("aa");
//        set.add(new Person("Tom",123));

//        举例1：
//        set.add(123);
//        set.add(456);
//        set.add(-31);
//        set.add(11);
//        set.add(8);

//        举例2：
        set.add(new Person("tom",12));
        set.add(new Person("mike",14));
        set.add(new Person("jerry",21));
        set.add(new Person("sheep",18));
        set.add(new Person("jerry",9));

        Iterator iterator = set.iterator();
        while (iterator.hasNext()){
            System.out.println(iterator.next()); //会按照从小打大的数据排序
        }
    }

    @Test
    public void test2(){

//        按照年龄从小到大排列
        Comparator com = new Comparator() {
            @Override
            public int compare(Object o1, Object o2) {
                if(o1 instanceof Person && o2 instanceof Person){
                    Person p1 = (Person) o1;
                    Person p2 = (Person) o2;
                    return Integer.compare(p1.getAge(),p2.getAge());
                }else{
                    throw new RuntimeException("输入的数据类型不一致");
                }
            }
        };
        TreeSet set = new TreeSet(com);
        set.add(new Person("tom",12));
        set.add(new Person("mike",14));
        set.add(new Person("jerry",21));
        set.add(new Person("sheep",18));
        set.add(new Person("jerry",9));
        Iterator iterator = set.iterator();
        while (iterator.hasNext()){
            System.out.println(iterator.next()); //会按照从小打大的数据排序
        }
    }
}