如何修复方法错误

Question

我只是想确保我在这里是正确的。我想方法添加到

• 变化高度
• 更改宽度
• 更改坐标
• 计算周长

• 计算面积

  public class MyRectangle { 
  
  public int width; 
  public int height; 
  public int y; 
  public int x; 
  
  public MyRectangle() 
  { 
      width=10; 
      height=10; 
      y=10; 
      x=10; 
  
  public int MyRectangle; 
  
  public MyRectangle(int width, int height, int y, int x, int MyRectangle) { 
      this.width = width; 
      this.height = height; 
      this.y = y; 
      this.x = x; 
      this.MyRectangle = MyRectangle; 
  } 
  } 
  

和我也得到非法开始表达式错误在我的方法。

Answer 1

这是你的问题，你不能在方法中有方法。 但是，这是由于你没有关闭你的方法的括号。 我定你的代码，并添加你想要的方式：

public class MyRectangle { 

    //Best to group your variables up here 
    public int MyRectangle; 
    public int width; 
    public int height; 
    public int y; 
    public int x; 

    public MyRectangle() { 
     width = 10; 
     height = 10; 
     y  = 10; 
     x  = 10; 
    }//Make sure to close this method with the bracket 

    public MyRectangle(int width, int height, int y, int x, int MyRectangle) { 
     this.width = width; 
     this.height = height; 
     this.y = y; 
     this.x = x; 
     this.MyRectangle = MyRectangle; 
    } 

    /** 
    * Changes the current height to the given new height 
    * @param newHeight 
    */ 
    public final void changeHeight(int newHeight) { 
     height = newHeight; 
    } 

    /** 
    * Changes the current width to the given new width 
    * @param newWidth 
    */ 
    public final void changeWidth (int newWidth) { 
     width = newWidth; 
    } 

    /** 
    * Calculates the current perimeter based on the width and height 
    * @return parameter ofd the rectangle 
    */ 
    public final int getPerimeter() { 
     return ((2 * width) + (2 * height)); 
    } 

    /** 
    * Calculates the area based on the width and height 
    * @return area of the rectangle 
    */ 
    public final int getArea() { 
     return (width * height); 
    } 

    public final void changesXCoordinate(int newX){ 
     x = newX; 
    } 

    public final void changesYCoordinate(int newY){ 
     y = newY; 
    } 

    public final void changesCoordinate(int newX, int newY) { 
     x = newX; 
     y = newY; 
    } 
} 

我会更加很快解释，只是想后正确的代码第一：目前的情况是P

，它还挺很难理解什么呢你正在寻找。

如果这是您正在寻找的，请将此标记为正确答案：D