此行有多個標記，Java構造函數錯誤（初學者級別）。

Question

我剛開始學習java，並不熟悉這門語言。這是一個在線任務，我爲了獲得樂趣並獲得更多的熟悉，並且無法弄清我在構造函數行中遇到的多個錯誤。請幫助

public class WhackAMole { 
    public static void main(String[] args) { 
    int score; 
    int molesLeft; 
    int attemptsLeft; 
    char [][]moleGrid=new char[10][10]; 
    int numAttempts; //is this needed 
    int gridDimensions; // is this also needed 

    /*Multiple markers at this line 
- Syntax error on token "int", delete this token 
- Syntax error, insert ";" to complete Statement 
- Syntax error on token "int", delete this token 
- numAttempts cannot be resolved to a variable 
- gridDimensions cannot be resolved to a variable 
- Syntax error on token "int", delete this token 
- The method WhackAMole(int, int) is undefined for the type 
WhackAMole*/ 
    WhackAMole(int numAttempts, int gridDimensions) { 
     this.numAttempts=numAttempts ; //error-cannot use this in static content 
     this.gridDimensions=gridDimensions ; // error-cannot use this in static content 

} 

} 

} 

Answer 1

將您的構造函數移出main（）方法。

Answer 2

我建議你做一些基本的初學者級別的java教程。你不能把構造函數放在另一個方法中（它在主要方法中）。還要使用this.numAttempts你需要對象屬性。我試圖移動代碼片段以使其更具有意義：

public class WhackAMole { 

    // Those are attributes 
    private int score; 
    private int molesLeft; 
    private int attemptsLeft; 
    private char[][] moleGrid = new char[10][10]; 
    private int numAttempts; // is this needed 
    private int gridDimensions; // is this also needed 

    // Constructor 
    public WhackAMole(int numAttempts, int gridDimensions) { 
     this.numAttempts = numAttempts; 
     this.gridDimensions = gridDimensions; 
    } 

    public void play() { 
     // Game logic here 
    } 

    /* This Method should propably be in another class */ 
    public static void main(String[] args) { 

     final WhackAMole wham = new WhackAMole(42, 1234567); 
     wham.play(); 
    } 
} 

Answer 3

您在java中不允許的方法中定義了方法。此外，我已將屬性移至課程級別。

請使用如下代碼：

public class WhackAMole { 

    int score; 
    int molesLeft; 
    int attemptsLeft; 
    char[][] moleGrid = new char[10][10]; 
    int numAttempts; //is this needed 
    int gridDimensions; // is this also needed 

    WhackAMole(final int numAttempts, final int gridDimensions) { 
     this.numAttempts = numAttempts; //error-cannot use this in static content 
     this.gridDimensions = gridDimensions; // error-cannot use this in static content 
    } 

    public static void main(final String[] args) { 
     WhackAMole whackAMole = new WhackAMole(30, 40); 
     System.out.println("numAttempts:" + whackAMole.numAttempts + " gridDimensions:" + whackAMole.gridDimensions); 
    } 
}