类型xxx中的方法xxx不适用于参数()

Question

我对java很陌生，我正在尝试用建筑类和城市类来做一个城市规划项目。当试图在城市类中为addStructure构建一个方法时，我得到了一个错误：“类型构建中的方法addStructure不适用于参数()”，该方法根据构建类中方法isValidPlacement中的条件返回true或false基。我不知道为什么，也不知道怎么解决。

public boolean addStructure(int x, int y, Building structure) {
    // x & y are new postions 
    // Structure is a building object called from building constructor
    int posx = x;
    int posy = y;
    int w = structure.getWidth();//Building width
    int l = structure.getLength();//Building length 
    int layw =  layout[0].length;// City width (Building type 2d array Building[][] layout 
    int layl = layout.length;// City length
    String sign = structure.toString();
    
    if (Building.isValidPlacement() == false) { // Error: The method isValidPlacement in the type Building is not applicable for arguments()
        return false;
    } else {
        for (int i = 0; i < x; i++) {
            for (int j = 0; j < y; j++) {
              layout[i][j] = new Building(sign,x,y);
            }
        }
        
    }
}

IsValidPlacement方法检查两个条件:如果建筑物在城市范围内，以及建筑物是否与现有建筑物重叠。

    public boolean isValidPlacement(Building[][] layout,int x, int y) { //example 2x2 
    //x and y are position of the building where we wish to plant
     // call for the get width function to compare 
    int w = getWidth();
    int l = getLength();
    int layw =  layout[0].length;
    int layl = layout.length;
//step 1 check for within city  
    if (x<0 || x+w > layw) { // check if x is outside of range 
        return false; 
    } else if (y < 0 || y+l > layl) { //Check if y is outside of range
        return false;
    }                 // If the above cond. all passed then check if overlap. 
        for (int i = x; i < x+w ; ) { 
            for (int j = y; j < y+l;) {
                if (layout[i][j] != null) {
                    return false;} 
                }
        } return true;
    }

这两个函数都应该返回true或false语句。

Answer 1

在这条线上-

if (Building.isValidPlacement() == false) { 
    // Error: The method isValidPlacement in the type Building is 
       not applicable for arguments()
        return false;
}

• 调用isValidPlacement方法时不带任何参数，尽管该方法包含参数。传入指定的参数以修复错误.