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文件到二维数组打印为空(Java)

[英]File to 2d array printing null (Java)

我目前正在开发一个游戏,现在(在游戏中)是一个关卡编辑器/阅读器。 我这样做的方法是将级别存储在txt文件中,然后将txt文件输入到bufferreader中,然后将文本文件放入2d数组中,例如[lines] [words]。 我的意思是,我希望第一个方括号中的数字表示您想要的行(来自文件),然后从该行中选择一个单词与另一个方括号。

我可以打印文件并将其存储在一个类的2d数组中,但是当我尝试将信息传输到另一个类时,例如: String strLevel = TextHandler.getLevel("res/levels.txt")
当我然后尝试打印strLevel [1] [1]时,它只是在控制台中打印出null(s)...

这是TextHandler.java的代码:

公共类TextHandler {

final static int LEVELS = Level.LEVEL_AMOUNT;
final static int MAX_LINES = 100;
final static int MAX_WORDS = 100;



public static String[][] getLevel(String path) throws IOException {
    int x = 0;
    int y = 0;

    String lines[][] = new String[MAX_LINES][MAX_WORDS];


    BufferedReader in = new BufferedReader(new FileReader(path));

    String line;

    while ((line = in.readLine()) != null)  //file reading
    {
       String[] values = line.split(" ");

       for (String str : values){   
           lines[x][y] = str;
           System.out.print(lines[x][y] + " ");    //This print funciton works!

           y += 1; 
       }

       x += 1;
       System.out.println("");
    }


    return lines;
}

}

这是文本文件:

0级
添加TYPE_WALL 100300400100
添加TYPE_WALL 20030020050
添加TYPE_WALL 400 53800 10
添加TYPE_PLAYER 200 40

1级
添加TYPE_WALL 100300400100
添加TYPE_WALL 20030020050
添加TYPE_WALL 400 53800 10
添加TYPE_PLAYER 100200

2级
//空级别

3级
//空级别

4级
//空级别

5级
//空级别

6级
//空级别

结果如下:

0级
添加TYPE_WALL 100300400100
添加TYPE_WALL 20030020050
添加TYPE_WALL 400 53800 10
添加TYPE_PLAYER 200 40

1级添加TYPE_WALL 100300400100添加TYPE_WALL 20030020050添加TYPE_WALL 400 53800 10添加TYPE_PLAYER 100200

2级

3级

4级

5级

6级
空值
空值
空值
空值
空值
空值
空值
空值
空值
空值

正如我之前所说,问题是当我尝试制作一个等于getLevel('path')的2D数组然后打印时,它会打印“ null”!

这是一些Level类代码:

包com.sontvedt.engine;

导入java.io.IOException; 导入java.util.ArrayList;

导入com.sontvedt.entity。*;

公共班级{

Utilities util = new Utilities();
TextHandler txt = new TextHandler();

static final int LEVEL_AMOUNT = 10;

String strLevel[][];

Player player;
Wall wall = new Wall(42,42,42,42);

ArrayList<Entity> objects = new ArrayList<Entity>();
Enemy[] enemies = new Enemy[20];        //This it later going to be added in the entities arrayList. The reason its a normal array is so that it would work with collision detection



//Pre-init of the levelAmount should be done here
public Level(){
    player = new Player(42, 42);

    try {
        strLevel = TextHandler.getLevel("res/levels.txt");
    } catch (IOException e) {
        e.printStackTrace();
    }



    //Init entities ArrayList       
        createLevels(0);

}

//Collision check
public void update(){
}


/*  LEVEL CREATION
 * 
 * The first thing that is going to be in the "level editor" text file
 * is which level the items are going to be added to. Like so:
 *      - level 0
 * 
 * The entity adding is later going to be added in a text file as so:
 *      - Group entity xPos yPos Width Height
 *      - enemies enemy 60 60, 200, 100
 * 
 * The player postition is the first two numbers in txt file,
 * Player is also the last item that should be added to entities
 * 
 * This may have to be in the end of the superloop
 *          
 * for(int i = 0; i < enemies.length; i++)
 *      entities[level].add(enemies[i]);
 * 
 */

public void createLevels(int level){
    objects.add(player);
    objects.add(wall);          

    //Should print add from text file/TextHandler.getLevel()
    System.out.println(strLevel[1][1]);


    for(int i = 0; i >= TextHandler.MAX_LINES; i++){
        for(int j = 0; j >= TextHandler.MAX_WORDS; j++){

            if(strLevel[j][j] == "level"){
                System.out.println("I found the word 'level', I'm so cool, look at meee... :P");
            }
        }
    }   
}

一直在寻找答案,但是我什么也没发现。

到达新行时,您无需重置y值:

while ((line = in.readLine()) != null)  //file reading
{
   String[] values = line.split(" ");
   y=0; // gotta start back at 0 when we get to a new line

其他的东西

//Should print add from text file/TextHandler.getLevel()
System.out.println(strLevel[1][1]);

注释不正确,应打印TYPE_WALL。


if(strLevel[j][j] == "level"){

使用.equals not ==比较字符串,以使用安全的空比较:

if("level".equals(strLevel[j][j]))

if(strLevel[j][j] == "level"){

我非常确定您的意思是strLevel[i][j] ,也因为您在其他地方使用xy时应尽量保持一致。 也许将i重命名为x ,将j重命名为y

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