File Reading Java

I am making a simple game with a save and load. So far, I have the save game working and it saves all the objects positions to a .dat file. Each line has 3 coordinates (x, y, z) split by a colon. Example:

23.762622833251953:3.887784719467163

22.5:0.5:18.5

23.5:0.5:20.5

26.5:0.5:5.5

28.5:0.5:21.5

30.5:0.5:4.5

33.5:0.5开发者_StackOverflow:19.5

35.5:0.5:4.5

38.5:0.5:15.5

39.5:0.5:3.5

41.5:0.5:9.5

The very first line is coordinates to the first-person view of the player. This is easy enough to implement since I pass each coordinate into an array, so the x-position is the first element [0] and the z coordinate is the second element [1]. The y coordinate is always the same, even for blocks, so I didn't bother saving it, but I did for the blocks for some reason.

Here is the method to save a game:

public void saveGame()
{
    File file = new File("quickSave.dat");

    try {
        FileWriter writer = new FileWriter(file);        
        writer.write(env.getCameraX()+":"+env.getCameraZ()+"\n");
        for (int row = 0; row < map.length; row++)
        {
            for (int col = 0; col < map[row].length; col++)
            {
                if (map[row][col] != null) {
                    EnvObject block = map[row][col];
                    writer.write(block.getX()+":"+block.getY()+":"+block.getZ()+"\n");
                }
            }
        }
        writer.close();
        JOptionPane.showMessageDialog(null, "Game saved");
    } catch (Exception e) {
        JOptionPane.showMessageDialog(null, e);
    }
}

The problem is reading each line from the file and then passing those coordinates into the object. I only implemented passing coordinates into the players perspective, which was easy because I was working with only 2 elements.

I was thinking of making another array with 2 dimensions (taking out the y-coordinate, the middle one), and each element is one line from the file, but how do I do this? Or is this another, more elegant way?

Here is my load game method so far:

public void loadGame() {
    File file = new File("quickSave.dat");
    try {
        BufferedReader reader = new BufferedReader(new FileReader(file));
        String line = reader.readLine();
        String[] elements = line.split(":");
        env.setCameraXYZ(new Float(elements[0]), 0.5,
            new Float(elements[1]));
        JOptionPane.showMessageDialog(null, "Game loaded");
    } catch (Exception e) {
        JOptionPane.showMessageDialog(null, e);
    }
}

---

How about using serialization? Store your state variables into an ObjectOutputStream and load them from an ObjectInputStream. Let the JVM handle all this low level bookkeeping for you, unless you really do need a format that is human-readable and editable.

---

BufferedReader.readLine() will help you. You'll need to split the read-in line with String.split(), and the convert each returned string into a float with Float.parseFloat() or new Float(someString).

I think that's what you're asking anyway

String line = null;
while ((line = bufferedReader.readLine()) != null)
{
    String[] coords = line.split(":");
    EnvObject block = new EnvObject(Float.parseFloat(coords[0],
                                    Float.parseFloat(coords[1],
                                    Float.parseFloat(coords[2]
                                    );
    someArray.add(block);
}