存储5个属性的最有效方法

Question

So I'm trying to store 5 attributes of an object, which are 5 different integers.

What would be the best way to store these? I was thinking of arrays, but arrays aren't flexible. I also need to be able to retrieve all 5 attributes, so arrays probably won't work well.

Here's some background if it helps: I am currently making a game similar to Terraria (or Minecraft in 2D). I wanted to store where the object is on the map(x,y) , where it is on the screen at the part of the map(x,y) , and what type of object it is.

Answer 1

import java.awt.Point

public class MyClass {
    private Point pointOnMap;
    private Point pointOnScreen;
    // ... 
}

The Point class binds x & y values into a single object (which makes sense) and gives you useful, basic methods it sounds like you'll need, such as translate and distance . http://docs.oracle.com/javase/7/docs/api/java/awt/Point.html

Answer 2

It is not possible to predict what is the most efficient way to store the attributes without seeing all of your code. (And I for one don't want to :-)) Second, you haven't clearly explained what you are optimizing for. Speed? Memory usage? Minimization of GC pauses?

However, this smells of premature optimization. Wasting lost of time trying to optimize performance on something that hasn't been built, and without any evidence that the performance of this part the codebase is going to be significant.

My advice would be:

1. Pick a simple design and implement it; eg 5 private int variables with getters and setters. If that is inconvenient , then choose a more convenient API.

2. Complete the program.

3. Get it working.

4. Benchmark it. Does it run fast enough? If yes, stop.

5. Profile it. Pick the biggest performance hotspot and optimize that.

6. Rerun the benchmarking and profile to check that your optimization has made things faster . If yes, then "commit" it. If not then back it out.

7. Go to step 4.

Answer 3

I would suggest HashMap where key can be objectId-attributeName and value will be integer value as you have to do retrieval based on key. This will be O(1) operation