import java.util.*;

public class Person implements Comparable<Person>//使Person的屬性具有比較性

{

PRivate String name;

private int age;

public Person(String name,int age)//初始化構造函數

{

this.name = name;

this.age = age;

}

public void set(String name,int age)//重新設置姓名和年齡

{

this.name = name;

this.age = age;

}

public String getName()//獲取姓名

{

return name;

}

public int getAge()//獲取年齡

{

return age;

}

public String toString()//將姓名和年齡以字符串的形式返回

{

returnname+","+age;

}

//出現重名時,再找到另一個hash地址用來存儲數據(底層自動調用)

publicinthashCode()

{

returnname.hashCode()+age*34;

}

//判斷接受的類是不是Person類,不是就拋出異常(底層自動調用)

publicbooleanequals(Object obj)

{

if(!(objinstanceofPerson))

thrownew ClassCastException("不是Person類");

Person p = (Person)obj;

returnthis.name.equals(p.name) &&this.age==p.age;

}

public int compareTo(Person p)//(按照自己的要求去作比較)

{

int num=new Integer(this.age).compareTo(p.age);

return num==0?this.name.compareTo(p.name):num;

}

}

public class Test

{

public static <T>void sop(T t)

{

System.out.println(t);

}

public static void main(String args[]) throws Exception

{

//創建一個map集合,用來存儲數據 <>表示接收的是泛型,即指定的類型

TreeMap<Person,String> map = new TreeMap<Person,String>(/*new Mycompare()*/);

//往集合添加數據

map.put(new Person("czhangsan1",11),"beijing");

map.put(newPerson("zhangsan5",15),"nanjing");

map.put(newPerson("azhangsan5",10),"shanghai");

map.put(newPerson("zhangsan2",20),"haierbing");

map.put(newPerson("bzhangsan2",20),"beijing");

map.put(newPerson("zhangsan3",12),"shanghai");

map.put(newPerson("zhangsan4",19),"changchun");

map.put(newPerson("zhangsan4",10),"changchun");

map.put(new Person("zhangsan4",10),"zhengzhou");

//將map集合轉換為set集合,因為map集合沒有迭代器 ，而set集合有

Set<Map.Entry<Person,String>> entryset = map.entrySet();

//獲取迭代器

Iterator<Map.Entry<Person,String>> it = entryset.iterator();

//用迭代器取數據

while(it.hasNext())

{

Map.Entry<Person,String> m = it.next();

Person key = m.getKey();//取出鍵

String value =m.getValue();//取出值

sop(key+"......."+"adress:"+value);//打印鍵和值

}

}

}

class Mycompare implements comparator<Perosn>//自定義一個比較器

{

public int compare(Person p1,Person p2)

{

int num = p1.getName().compareTo(p2.getName());

return num==0?new Integer(p1.getAge()).compareTo(new Integer(p2.getAge())):num;

}

}

//注意：上面的兩種形式都實現了比較,任選其中一種就可以。要么實現comparable接口；要么在集合中傳入自定義的比較器。