应用实例

import java.io.*;public class DataStreamDemo{	public static void main(String[] args)	{		try 		{			DataOutputStream out=new DataOutputStream(new FileOutputStream("F:\\workspace\\JavaPrj\\test.txt"));			double[] prices={18.99,9.22,14.22,5.22,4.21};			int[] units={10,10,20,39,40};			String[] descs={"bike","book","boat","boot","bus"};			for(int i=0;i
      
       0)		{			str+=" ";			n--;		}		return str;	}}