1 package cn.itcast.p5.generic.advance.demo;
 2 
 3 import java.util.TreeSet;
 4 import java.util.Collection;
 5 import java.util.Comparator;
 6 import java.util.Iterator;
 7 import java.util.TreeSet;
 8 
 9 import com.sun.crypto.provider.PBEKeyFactory.PBEWithSHA1AndRC2_40;
10 
11 import cn.itcast.p2.bean.Person;
 
12 import cn.itcast.p2.bean.Student;
13 import cn.itcast.p2.bean.Worker;
14 
15 public class GenericAdvanceDemo5 {
16 
17     public static void main(String[] args) {
18         // TODO Auto-generated method stub
19         TreeSet<Person> al1 = new TreeSet<Person>(new CompByName());
20         
21
 
         
22         al1.add(new Person("abc4",34));
23         al1.add(new Person("abc",30));
24         al1.add(new Person("abc2",38));
25         
26         TreeSet<Student> al2 = new TreeSet<Student>(new CompByStuName());
27         al2.add(new Student("stu1",11));
28         al2.add(new
 
 Student("stu7",20));
29         al2.add(new Student("stu2",22));
30         
31         TreeSet<Worker> al3 = new TreeSet<Worker>(new CompByName());
32         al3.add(new Worker("stu1",11));
33         al3.add(new Worker("stu5",24));
34         al3.add(new Worker("stu2",22));
35         
36         TreeSet<String>  al4 = new TreeSet <String>();
37         al4.add("abcsaasd");
38         
39 //        al1.addAll(al2);
40 //        System.out.println(al1.size());
41         al1.addAll(al2);
42         
43         Iterator<Worker> it = al3.iterator();
44         while(it.hasNext()) {
45             System.out.println(it.next());
46         }
47 
48     
49     }
50 
51 
52 }
53 /*
54  * class TreeSet<E>{
55  *     Tree(Comparator<? super E> comp);
56  * }
57  * 
58  * 什麼時候用下限呢？通常對集合中的元素進行取出操作時，可以是用下限
59  */
60 class CompByName implements Comparator<Person>{
61 
62     @Override
63     public int compare(Person o1, Person o2) {
64         // TODO Auto-generated method stub
65         int temp = o1.getName().compareTo(o2.getName());
66         return temp==0?o1.getAge()-o2.getAge():temp;
67     }
68     
69 }
70 class CompByStuName implements Comparator<Student>{//執行的都是父類的東西
71 
72     @Override
73     public int compare(Student o1, Student o2) {
74         // TODO Auto-generated method stub
75         int temp = o1.getName().compareTo(o2.getName());
76         return temp==0?o1.getAge()-o2.getAge():temp;
77     }
78     
79 }

 1 package cn.itcast.p2.bean;
 2 
 3 public class Person implements Comparable<Person>{
 4     private String name;
 5     private int age;
 6     
 7     
 8     public Person() {
 9         super();
10         // TODO Auto-generated constructor stub
11     }
12     
13     public Person(String name, int age) {
14         super();
15         this.name = name;
16         this.age = age;
17     }
18     public int compareTo(Person p) {//指定比較型別，傳入比較型別
19 //        Person p= (Person)obj;
20         int temp = this.age-p.age;
21         return temp==0?this.name.compareTo(p.name):temp;
22     }
23     
24     
25 //    @Override
26 //    public boolean equals(Object obj) {//不能把Object改為Person，equals方法來自Object，Object沒有定義泛型
27 //        // TODO Auto-generated method stub
28 //        if (this == obj) {
29 //            return true;
30 //        }
31 //        if (!(obj instanceof Person)) {
32 //            throw new RuntimeException()
33 //        }
34 //        Person p = (Person)obj;
35 //        return super.equals(obj);
36 //    }
37     /*
38      * @Override public int hashCode() { final int prime = 31; int result = 1;
39      * result = prime * result + age; result = prime * result + ((name == null) ? 0
40      * : name.hashCode()); return result; }
41      * 
42      * @Override public boolean equals(Object obj) { if (this == obj) return true;
43      * if (obj == null) return false; if (getClass() != obj.getClass()) return
44      * false; Person other = (Person) obj; if (age != other.age) return false; if
45      * (name == null) { if (other.name != null) return false; } else if
46      * (!name.equals(other.name)) return false; return true; }//alt+shift+s
47      * hashCode和equals
48      */
49     public String getName() {
50         return name;
51     }
52     public void setName(String name) {
53         this.name = name;
54     }
55     public int getAge() {
56         return age;
57     }
58     public void setAge(int age) {
59         this.age = age;
60     }
61 
62     @Override
63     public String toString() {
64         return "Person:"+getName()+":"+getAge();
65     }
66     
67     
68 }

 1 package cn.itcast.p2.bean;
 2 
 3 public class Student extends Person {
 4 
 5     public Student() {
 6         super();
 7         // TODO Auto-generated constructor stub
 8     }
 9 
10     public Student(String name, int age) {
11         super(name, age);
12         // TODO Auto-generated constructor stub
13     }
14 
15     @Override
16     public String toString() {
17         // TODO Auto-generated method stub
18         return "Student:"+getName()+":"+getAge();
19     }
20     
21 }

 1 package cn.itcast.p2.bean;
 2 
 3 public class Worker extends Person {
 4 
 5     public Worker() {
 6         super();
 7         // TODO Auto-generated constructor stub
 8     }
 9 
10     public Worker(String name, int age) {
11         super(name, age);
12         // TODO Auto-generated constructor stub
13     }
14 
15     @Override
16     public String toString() {
17         // TODO Auto-generated method stub
18         return "Worker:"+getName()+":"+getAge();
19     }
20     
21     
22 }