点击查看大图
/* From http://Java.sun.com/docs/books/tutorial/index.Html */
import java.io.EOFException;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
public class DataIOTest2 {
public static void main(String[] args) throws IOException {
// write the data out
ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(
"invoice1.txt"));
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" };
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');
}
out.close();
// read it in again
ObjectInputStream in = new ObjectInputStream(new FileInputStream(
"invoice1.txt"));
double price;
int unit;
String desc;
double total = 0.0;
try {
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;
}
} catch (EOFException e) {
}
System.out.println("For a TOTAL of: $" + total);
in.close();
}
}
