java_classes/ReadWriteData.java at master · AndyMender/java_classes · GitHub

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// demonstrate I/O binary operations on files
importjava.io.*;

classReadWriteData {
publicstaticvoidmain(String[] args) {
inti = 10;
doubled = 1023.56;
booleanb = true;

// try to write some binary data
try (DataOutputStreamaFileOut =
newDataOutputStream(newFileOutputStream("test_binary_data")))
 {
System.out.printf("Writing %d to file.\n", i);
aFileOut.writeInt(i);

System.out.printf("Writing %.2f to file.\n", d);
aFileOut.writeDouble(d);

System.out.println("Writing " + b + " to file.");
aFileOut.writeBoolean(b);
 } catch (IOExceptionaExc) {
System.out.println("Cannot write file due to exception: " + aExc);
return;
 }

// try to read some binary data
try (DataInputStreamaFileIn =
newDataInputStream(newFileInputStream("test_binary_data")))
 {
System.out.println("Reading i from file: " + aFileIn.readInt());
System.out.println("Reading d from file: " + aFileIn.readDouble());
System.out.println("Reading b from file: " + aFileIn.readBoolean());
 } catch (IOExceptionaExc) {
System.out.println("Cannot read file due to exception: " + aExc);
 }

// TODO: figure out how DataInputStream recognizes binary data in sequence
 }
}