setdemo.java

java2应用开发指南第一版

//SetDemo.java
import java.util.*;

public class SetDemo
{
	public static void main( String[] args )
	{
		String strMonths[]={
			"一月","二月","三月",
			"四月","五月","六月",
			"七月","八月","九月",
			"十月","十月","十二月"
		};
		
		//get count of months(Key)
		int nMonthLen= strMonths.length;
		//create HashSet object
		Set set= new HashSet();
		//put element into HashSet object
		for( int i=0; i< 100; i++){
			int index=(int)(Math.random()*nMonthLen);
			set.add(strMonths[index]);
		}
		//print all element value in HashSet
		//get Iterator
		Iterator it=set.iterator();
		while( it.hasNext()){
			System.out.println(it.next());
		}
	}
}