dataiotest.java

本书属于《开发专家之 Sun ONE》系列丛书

//【代码7-6-2】
//DataIOTest.java
import java.io.*;

public class DataIOTest
{
    public static void main(String[] args) throws IOException
{
        //创建数据输出流
        DataOutputStream out = new DataOutputStream(new
				   FileOutputStream("content.txt"));
		//初始化输出数据
        double[] prices = { 19.99, 9.99, 15.99, 3.99, 4.99 };
        int[] units = { 12, 8, 13, 29, 50 };
        String[] descs = {
 "Java T-shirt",
			   "Java Mug",
			   "Duke Juggling Dolls",
			   "Java Pin",
			   "Java Key Chain" 
};
        //数据输出
        for (int i = 0; i < prices.length; i ++)
{
            out.writeDouble(prices[i]);
            out.writeChar('\t');
            out.writeInt(units[i]);
            out.writeChar('\t');
            out.writeChars(descs[i]);
            out.writeChar('\n');
        }
		//关闭数据输出流
        out.close();

        //创建数据输入流
        DataInputStream in = new DataInputStream(
new	 FileInputStream("content.txt"));

        double price;
        int unit;
        String desc;
        double total = 0.0;

        try 
{
	//利用数据输入流读文件内容
            while (true)
{
                price = in.readDouble();
                in.readChar();       // throws out the tab
                unit = in.readInt();
                in.readChar();       // throws out the tab
                desc = in.readLine();
                System.out.println("You've ordered " +
				    unit + " units of " +
				    desc + " at $" + price);
                total = total + unit * price;
            }
        } 
		//捕获异常
catch (EOFException e)
{
		e.printStackTrace();
        }
        System.out.println("For a TOTAL of: $" + total);
		//关闭数据输入流
        in.close();
    }
}