package test;
import java.util.Iterator;
import java.util.TreeSet;
public class Test_01
{
@SuppressWarnings({ "rawtypes", "unchecked" })
public static void main(String[] args)
{
TreeSet ts = new TreeSet();
ts.add(new Student("lisi03", 39));
ts.add(new Student("lisi03", 40));
ts.add(new Student("lisi007", 20));
ts.add(new Student("lisi02", 22));
ts.add(new Student("lisi09", 19));
// ts.add (new Student("lisi08",19));
Iterator it = ts.iterator();
while (it.hasNext())
{
Student stu = (Student) it.next();
System.out.println(stu.getName() + ":::::" + stu.getAge());
}
}
}
@SuppressWarnings("rawtypes")
class Student implements Comparable // 该接口强制让学生具备比较性
{
private String name;
private int age;
Student(String name, int age)
{
this.name = name;
this.age = age;
}
public int compareTo(Object obj)
{
if (!(obj instanceof Student))
{
throw new RuntimeException("不是学生对象");
}
Student s = (Student) obj;
System.out.println(this.name + "...compareto...." + s.name);
if (this.age > s.age)
return 1;
if (this.age == s.age) // 年龄条件是主要条件
return this.name.compareTo(s.name); // 比较名字是否相同时次要条件
return -1;
}
public String getName()
{
return name;
}
public int getAge()
{
return age;
}
}
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