import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
//comparator、comparable的用法(按照要求将map集合的键值对进行顺序输出)
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
{
// 创建一个map集合,用来存储数据 <>表示接收的是泛型,即指定的类型
List<Person> list = new ArrayList<Person>();
// 往集合添加数据
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"));
// 将map集合转换为set集合,因为map集合没有迭代器 ，而set集合有
Collections.sort(list);
System.out.println("按年龄排序：");
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的属性具有比较性
{
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 + ", 年龄：" + age + ", 地址：" + address;
}
// 按年龄大小排序规则
@Override
public int compareTo(Person o)
{
return this.age.compareTo(o.getAge());
}
}
// 按姓名字典顺序排序
class MyCompare implements Comparator<Person>// 自定义一个比较器
{
@Override
public int compare(Person o1, Person o2)
{
return o1.getName().compareTo(o2.getName());
}
}
// 注意：上面的两种形式都实现了比较,任选其中一种就可以。要么实现comparable接口；要么在集合中传入自定义的比较器。