Question

我非常擅长使用GUI和JPanel与Java。现在我正在开发一款可以保存和加载的游戏。保存时，它需要一个JArray，并且根据某个地方或某个图片是否有任何内容，将0s, 1s, and 2s保存到文件中。加载时，它会查看0s, 1s, and 2s并将相应位置（在for循环中）替换为带有图片或没有任何内容。

当我加载游戏时，它几乎不会加载并错误地显示“NoSuchElementException”。这是我的负担：

 public void loadGame() throws FileNotFoundException{

        String fileName = JOptionPane.showInputDialog("What is your file's name?") + ".txt";
        Scanner reader = new Scanner(new FileReader(fileName));
         playerOne = reader.next();
         playerTwo = reader.next();
         counter = reader.nextInt();
        for (int i = 1; i < grid_height-1; i++) {
            for (int j = 1; j <= grid_width-1; j++) {

                    if(reader.nextInt() == 1){game[i][j].setIcon(p1);}
                    if(reader.nextInt() == 2){game[i][j].setIcon(p2);} 
                    else if(reader.nextInt() == 0){game[i][j].setIcon(null); } } } 

    reader.close(); 
} 

    }

如果需要，我的保存：

        public void saveGame() throws FileNotFoundException{
        String fileName = JOptionPane.showInputDialog("What will you name your file?") + ".txt";
        PrintWriter out = new PrintWriter(fileName);
        out.println(playerOne);
        out.println(playerTwo);
        out.println(counter);
        for (int i = 1; i < grid_height-1; i++) {
            for (int j = 1; j <= grid_width-1; j++) {
                if(game[i][j].getIcon() == null){out.println(0); }
                else if(game[i][j].getIcon() == p1){out.println(1);}
                else if(game[i][j].getIcon() == p2){out.println(2); }
            }
        }
        out.close();
        JOptionPane.showMessageDialog(null, "Saved successfully!", "Saved", 
                JOptionPane.PLAIN_MESSAGE);

    }

非常感谢任何帮助。错误通常在代码中的if（reader.nextInt（）==＃）处发生。我已经在文件中确定接下来还有一个整数。

Answer 1

您应该正确保存nextInt的返回值并将其用于比较。

public void loadGame() throws FileNotFoundException{

       //your code here ........
        for (int i = 1; i < grid_height-1; i++) {
            for (int j = 1; j <= grid_width-1; j++) {
                    if(reader.hasNext()){
                         int next = reader.nextInt(); //save the return value and use it for comparision

                         if (next == 1){game[i][j].setIcon(p1);}
                         if (next  == 2){game[i][j].setIcon(p2);} 
                         else if(next  == 0){game[i][j].setIcon(null);
                    } //close the if loop
        //rest of your code here .......

加载/保存GUI游戏 - NoSuchElementException错误

1 个答案: