collectiontest.java

一些JavaAPI测试的源代码(包括一些Java中常用的数据结构类

/**
 *Author Miracle
 *Time	2005.11.24 21:00
 *
 */
 import java.util.*;
 
 public class CollectionTest
 {
 	public static void printElements(Collection c)
 	{
 		Iterator iterator = c.iterator();
 		while (iterator.hasNext())
 		{
 			System.out.println(iterator.next());
 		}
 	}
 	public static void main(String [] args)
 	{
 		Student s1 = new Student(2,"dengjiebing");
 		Student s2 = new Student(3,"zhoutao");
 		Student s3 = new Student(1,"zheshandian");
 		Student s4 = new Student(4,"yaohua");
		ArrayList al = new ArrayList();
		al.add(s1);
		al.add(s2);
		al.add(s3);
		al.add(s4);
		Collections.sort(al);
		printElements(al);
 	}
 	
 }
 
 class Student implements Comparable
 {
 	int num;
 	String name;
 	Student(int num,String name)
 	{
 		this.num =num;
 		this.name = name;
 	}
 	
 	public int comparaTo(Object o)
 	{
 		Student s = (Student)o;
 		return num>s.num?1:(num==s.num?0:-1);
 		
 	}
 	public String toString()
 	{
 		return num+":"+this.name;
 	}
 	
 	class StudentComparator implements Comparator
 	{
 		public int compare(Object o1,Object o2)
		{
			Student s1 = (Student)o1;
			Student s2 = (Student)o2;
			return  s1.num > s2.num?1:(s1.num==s2.num?0:-1);
		
		}
 	}
 }