（泛型）FanXingXianDing

package jihe;

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

class Person7
{
    private String name;
    Person7(String name)
    {
        this.name=name;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}

class Student7 extends Person7
{
    Student7(String name)
    {
        super(name);
    }
}

class Worker7 extends Person7
{
    Worker7(String name)
    {
        super(name);
    }

}
class Add7
{
    void stuAdd(){
    TreeSet<Student7> s=new TreeSet<Student7>(new Cp());
    s.add(new Student7("java 01"));
    s.add(new Student7("java 02"));
    s.add(new Student7("java 03"));
    s.add(new Student7("java 04"));
    s.add(new Student7("java 05"));
    /*
    Iterator<Student7> it=s.iterator();
    while(it.hasNext())
    {
        System.out.println("stu: "+it.next().getName());
    }
    */
    Iter(s);
    }
    void worAdd()
    {
        TreeSet<Worker7> w=new TreeSet<Worker7>(new Cp());
        w.add(new Worker7("+++java 01"));
        w.add(new Worker7("+++java 02"));
        w.add(new Worker7("+++java 03"));
        w.add(new Worker7("+++java 04"));
        w.add(new Worker7("+++java 05"));
        /*
        Iterator<Worker7> it=w.iterator();
        while(it.hasNext())
        {
            System.out.println("wor: "+it.next().getName());
        }
        */
        Iter(w);
    }
    public void Iter(TreeSet<? extends Person7> ts)//泛型迭代器，<? extends Person7>如此此迭代器上限为Person7，可以为其子类所用
    {
        Iterator<? extends Person7> it=ts.iterator();
        while(it.hasNext())
        {
            System.out.println(it.next().getName());
        }
    }
}

class Cp implements Comparator<Person7>//泛型比较器，此比较器需要的元素是name，而父类含有，所以直接用父类泛型调用
{                                       //有多个集合时，可以将其要进行比较的元素放在父类，这样泛型后就避免了强制转换
    public int compare(Person7 p1,Person7 p2)
    {
        return p2.getName().compareTo(p1.getName());
    }
}
public class FanXingXianDing {
    public static void main(String[] args) {
        Add7 a=new Add7();
        a.stuAdd();
        a.worAdd();
    }
}