import java.util.ArrayList;

import java.util.Collections;

import java.util.Comparator;

//comparator、comparable的用法(按照要求將map集合的鍵值對進行順序輸出)

import java.util.List;

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

List<Person> list = new ArrayList<Person>();

// 往集合添加數據

list.add(new Person("czhangsan1", "11", "beijing"));

list.add(new Person("zhangsan5", "15", "nanjing"));

list.add(new Person("azhangsan5", "10", "shanghai"));

list.add(new Person("zhangsan2", "20", "haierbing"));

list.add(new Person("bzhangsan2", "20", "beijing"));

list.add(new Person("zhangsan3", "12", "shanghai"));

list.add(new Person("zhangsan4", "19", "changchun"));

list.add(new Person("zhangsan4", "10", "changchun"));

list.add(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

Collections.sort(list);

System.out.println("按年齡排序：");

for (Person person : list)

{

System.out.println(person.toString());

}

Collections.sort(list, new MyCompare());

System.out.println("按姓名排序：");

for (Person person : list)

{

System.out.println(person.toString());

}

}

}

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

{

private String name;

private String age;

private String address;

public Person(String name, String age, String address)// 初始化

{

this.name = name;

this.age = age;

this.address = address;

}

public String getName()

{

return name;

}

public void setName(String name)

{

this.name = name;

}

public String getAge()

{

return age;

}

public void setAge(String age)

{

this.age = age;

}

public String getAddress()

{

return address;

}

public void setAddress(String address)

{

this.address = address;

}

@Override

public String toString()

{

return "姓名：" + name + ", 年齡：" + age + ", 地址：" + address;

}

// 按年齡大小排序規則

@Override

public int compareTo(Person o)

{

return this.age.compareTo(o.getAge());

}

}

// 按姓名字典順序排序

class MyCompare implements Comparator<Person>// 自定義一個比較器

{

@Override

public int compare(Person o1, Person o2)

{

return o1.getName().compareTo(o2.getName());

}

}

// 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。