Java Reference
In-Depth Information
// Create the polyline objects and write them to the file
System.out.println("Writing objects to file.");
try (ObjectOutputStream objectOut = new ObjectOutputStream(
new
BufferedOutputStream(Files.newOutputStream(file)))){
// Create a polyline from the coordinates
PolyLine polygon1 = new PolyLine(coords);
System.out.println(polygon1);
objectOut.writeObject(polygon1);
// Write first object
PolyLine polygon2 = new PolyLine(coords);
polygon2.addPoint(10., 10.);
System.out.println(polygon2);
// Add a point
objectOut.writeObject(polygon2);
// Write second
object
PolyLine polygon3 = new PolyLine(coords);
polygon3.addPoint(10., 15.);
System.out.println(polygon3);
// Add a point
objectOut.writeObject(polygon3);
// Write third object
System.out.println("File written.");
} catch(IOException e) {
e.printStackTrace();
System.exit(1);
}
// Read the objects back from the file
PolyLine polylines[] = new PolyLine[3];
System.out.println("\nReading objects from the file:");
try (ObjectInputStream objectIn =
new ObjectInputStream(
new
BufferedInputStream(Files.newInputStream(file)))){
for(int i = 0 ; i<polylines.length ; ++i) {
polylines[i] = (PolyLine)objectIn.readObject();
}
} catch(ClassNotFoundException e) {
System.err.println("Class not found.");
e.printStackTrace();
} catch(IOException e){
e.printStackTrace();
}
// Display the objects read from the file
for(int i = 0 ; i<polylines.length ; ++i)
System.out.println(polylines[i]);
}
}
Directory "TryPolyLineObjects"
This produces the following output:
