Отсутствует ключ точка на Вычислите площадь треугольника

Question

import javabook.*; 


class Triangle 
{ 
    // DATA 
    //............................................................ 

    //Private Variables 
     private double theBase; 
     private double theHeight; 
     private double theArea;          //base and height = Area is enough calculation 

    // CONSTRUCTORS 
    //............................................................ // same name as the class and the file name 
    public Triangle()            
    { 
     this.theBase=0; 
     this.theHeight=0; 
     this.theArea=0; 
    } 

    public Triangle(OutputBox oBox, MainWindow mWindow)   
    { 
     this.theBase=0; 
     this.theHeight=0;           this.theArea=0;            //This is a proof that the area of any triangle is 1/2 b x h’ of a base and height and the ‘area of a triangle is half of the base times the height’. 
    }           


    public void calculateArea()   
    {                        
     InputBox iBox = new InputBox(mWindow); 
     this.theBase = iBox.getDouble("Please enter the length of the base of the triangle "); 
     this.theHeight = iBox.getDouble("Please enter the height of the triangle"); 
     computeArea(); 
     oBox.println(" The area of a triangle of base : " + this.theBase+ " and height : " + this.theHeight +" is equal to : "+ this.theArea); 
    } 

    // METHODS - behaviours 
    //............................................................ 
    public void computeArea() 
    { 
     this.theArea = (this.theBase/2) * this.theHeight;   
                  }                

    // METHODS - gets (accessors) and sets (mutators) 
    //............................................................ 

    //length 
    public void setThebase(double base) 
    { 
      this.theBase= base; 
    } 

    public double getTheBase() 
    { 
      return(this.theBase); 
    } 

    //breath 
    public void setTheHeight(double height) 
    { 
      this.theHeight= height; 
    } 

    public double getTheHeight() 
    { 
      return(this.theHeight); 
    } 

    //area 
    public double getTheArea() 
    { 
      return(this.theArea); 
    } 
} 

Я-то не хватает или выше this.theBase = iBox.getDouble («Пожалуйста, введите длину основания треугольника»); Может ли кто-нибудь указать на то, что я оставил? Будьте осторожны, поскольку я изучаю Java и обязан совершать ошибки.

Это переработанные сообщения об ошибках после фиксации фиктивного {характера:

]./Triangle.java:42: cannot find symbol 
symbol : variable mWindow 
location: class Triangle 
     InputBox iBox = new InputBox(mWindow); 
            ^
./Triangle.java:46: cannot find symbol 
symbol : variable oBox 
location: class Triangle 
     oBox.println(" The area of a triangle of base : " + this.theBase+ " and height : " + this.theHeight +" is equal to : "+ this.theArea); 

Обновлен 4 ошибки:

./Triangle.java:36: cannot find symbol 
symbol : variable oBox 
location: class Triangle 
     this.oBox = oBox; 
      ^
./Triangle.java:37: cannot find symbol 
symbol : variable mWindow 
location: class Triangle 
     this.mWindow = mWindow;          //This is a proof that the area of any triangle is 1/2 b x h’ of a base and height and the ‘area of a triangle is half of the base times the height’. 
      ^
./Triangle.java:47: cannot find symbol 
symbol : variable mwindow 
location: class Triangle 
     InputBox iBox = new InputBox(mwindow); 
            ^
./Triangle.java:51: cannot find symbol 
symbol : variable oBox 
location: class Triangle 
     oBox.println(" The area of a triangle of base : " + this.theBase+ " and height : " + this.theHeight +" is equal to : "+ this.theArea); 
     ^
Note: App.java uses or overrides a deprecated API. 
Note: Recompile with -Xlint:deprecation for details. 
4 errors 
      ^

Answer 1

Всего код после первого } не принадлежит к способу, так ... вам нужно это сделать. Что-то вроде этого:

public Triangle(OutputBox oBox, MainWindow mWindow) { 
    this.theBase=0; 
    this.theHeight=0 
    this.theArea=0;           
    } 
    public void calculateArea() {           
    InputBox iBox = new InputBox(mWindow); 
    this.theBase = iBox.getDouble("Please enter the length of the base of the triangle "); 
    this.theHeight = iBox.getDouble("Please enter the height of the triangle"); 
    computeArea(); 
    oBox.println(" The area of a triangle of base : " + this.theBase+ " and height : " + this.theHeight +" is equal to : "+ this.theArea ); 
    } 
} 

Тогда вы можете просто позвонить calculateArea() после внесения Triangle объекта.

Дайте мне знать, если у вас есть какие-либо вопросы или проблемы.

---

Что касается других ваших ошибок, они, потому что вы не хранить значения mWindow и oBox. Изменение:

public Triangle(OutputBox oBox, MainWindow mWindow)   
    { 
     this.theBase=0; 
     this.theHeight=0; 
     this.theArea=0; 
     //This is a proof that the area of any triangle is 1/2 b x h’ of a base and height and the ‘area of a triangle is half of the base times the height’. 
    } 

в

public Triangle(OutputBox oBox, MainWindow mWindow)   
    { 
     this.theBase=0; 
     this.theHeight=0; 
     this.theArea=0; 
     this.oBox = oBox; 
     this.mWindow = mWindow; 
     //This is a proof that the area of any triangle is 1/2 b x h’ of a base and height and the ‘area of a triangle is half of the base times the height’. 
    } 

и добавить oBox и mWindow в с частными переменными.

Обратите внимание: если конструктор не используется, вы получите сообщение об ошибке во время выполнения.

---

import javabook.*; 


class Triangle 
{ 
    // DATA 
    //............................................................ 

    //Private Variables 
     private double theBase; 
     private double theHeight; 
     private double theArea;          //base and height = Area is enough calculation 
     private OutputBox oBox; 
     private MainWindow mWindow; 

    // CONSTRUCTORS 
    //............................................................ // same name as the class and the file name 

    public Triangle(OutputBox oBox, MainWindow mWindow)   
    { 
     this.theBase=0; 
     this.theHeight=0; 
     this.theArea=0;            //This is a proof that the area of any triangle is 1/2 b x h’ of a base and height and the ‘area of a triangle is half of the base times the height’. 
     this.oBox = oBox; 
     this.mWindow = mWindow; 
    }           


    public void calculateArea()   
    {                        
     InputBox iBox = new InputBox(this.mWindow); 
     this.theBase = iBox.getDouble("Please enter the length of the base of the triangle "); 
     this.theHeight = iBox.getDouble("Please enter the height of the triangle"); 
     computeArea(); 
     this.oBox.println(" The area of a triangle of base : " + this.theBase+ " and height : " + this.theHeight +" is equal to : "+ this.theArea); 
    } 

    // METHODS - behaviours 
    //............................................................ 
    public void computeArea() 
    { 
     this.theArea = (this.theBase/2) * this.theHeight;   
                  }                

    // METHODS - gets (accessors) and sets (mutators) 
    //............................................................ 

    //length 
    public void setThebase(double base) 
    { 
      this.theBase = base; 
    } 

    public double getTheBase() 
    { 
      return(this.theBase); 
    } 

    //breath 
    public void setTheHeight(double height) 
    { 
      this.theHeight= height; 
    } 

    public double getTheHeight() 
    { 
      return(this.theHeight); 
    } 

    //area 
    public double getTheArea() 
    { 
      return(this.theArea); 
    } 
}