43 lines
1.2 KiB
Java
43 lines
1.2 KiB
Java
// iostreams/StoringAndRecoveringData.java
|
|
// (c)2020 MindView LLC: see Copyright.txt
|
|
// We make no guarantees that this code is fit for any purpose.
|
|
// Visit http://OnJava8.com for more book information.
|
|
import java.io.*;
|
|
|
|
public class StoringAndRecoveringData {
|
|
public static void main(String[] args) {
|
|
try(
|
|
DataOutputStream out = new DataOutputStream(
|
|
new BufferedOutputStream(
|
|
new FileOutputStream("Data.txt")))
|
|
) {
|
|
out.writeDouble(3.14159);
|
|
out.writeUTF("That was pi");
|
|
out.writeDouble(1.41413);
|
|
out.writeUTF("Square root of 2");
|
|
} catch(IOException e) {
|
|
throw new RuntimeException(e);
|
|
}
|
|
try(
|
|
DataInputStream in = new DataInputStream(
|
|
new BufferedInputStream(
|
|
new FileInputStream("Data.txt")))
|
|
) {
|
|
System.out.println(in.readDouble());
|
|
// Only readUTF() will recover the
|
|
// Java-UTF String properly:
|
|
System.out.println(in.readUTF());
|
|
System.out.println(in.readDouble());
|
|
System.out.println(in.readUTF());
|
|
} catch(IOException e) {
|
|
throw new RuntimeException(e);
|
|
}
|
|
}
|
|
}
|
|
/* Output:
|
|
3.14159
|
|
That was pi
|
|
1.41413
|
|
Square root of 2
|
|
*/
|