JDK中自带的排序类

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.List;


class Student {
	private Integer id;
	public Integer getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Date getBirth() {
		return birth;
	}
	public void setBirth(Date birth) {
		this.birth = birth;
	}
	private String name;
	private Date birth;
	
	public Student() {
		this.birth = new Date();
		this.id = 0;
		this.name = "";
	}
	
	public Student(int id, String name, Date birth) {
		this.id = id;
		this.name = name;
		this.birth = birth;
	}
	
	public String toString() {
		return "{id = " + id + ";name = " + name + ";birth = " + birth + "}";
	}
}

public class ComparatorTest {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		@SuppressWarnings("deprecation")
		Student s1 = new Student(001, "jim", new Date(1987, 9, 24));
		@SuppressWarnings("deprecation")
		Student s2 = new Student(003, "abc", new Date(1983, 9, 24));
		@SuppressWarnings("deprecation")
		Student s3 = new Student(002, "efe", new Date(1985, 9, 24));
		
		List<Student> list = new ArrayList<Student>();
		list.add(s1);
		list.add(s2);
		list.add(s3);
		System.out.println(list);
		Collections.sort(list, new Comparator<Student>() {

			@Override
			public int compare(Student o1, Student o2) {
				// TODO Auto-generated method stub
				
				return o1.getBirth().compareTo(o2.getBirth());
			}
			
		});
		System.out.println(list);
	}

}

 直接重载Comparator中的compare方法就OK啦。