Question

我在查找如何根据Main类的用户输入获取输出时遇到问题。我已经有键盘输入，用户可以在其中输入一个值，该值将被保留。我猜我需要使用它，例如的（input.input1（））; 即可。但是我还需要在CalculatingRocketFlightProfile类中包含计算结果的方法，例如 calculate.theAverageMassFfTheVehicle ，我只是不确定如何将两者结合起来得到结果。

//计算类

public class CalculatingRocketFlightProfile { //Calculation class

//Declaring fields
public double totalImpulse ;
public double averageImpulse;
public double timeEjectionChargeFires;
public double massEmptyVehicle;
public double engineMass;
public double fuelMass; 
//Declaring variables for outputs
public double theAverageMassOfTheVehicle;
public double theVehiclesMaximumVelocity;

public CalculatingRocketFlightProfile(double totalImpulse, double averageImpulse, double timeEjectionChargeFires, double massEmptyVehicle,
                                  double engineMass, double fuelMass) { //Constructor for this class

                        this.totalImpulse  = totalImpulse;
                        this.averageImpulse = averageImpulse;
                        this.timeEjectionChargeFires = timeEjectionChargeFires;
                        this.massEmptyVehicle = massEmptyVehicle;
                        this.engineMass = engineMass;
                        this.fuelMass = fuelMass;
                    }


//Mutators and Accessors

//Accessors
//Methods for calculations - Calculating outputs, using inputs. 

public double theAverageMassOfTheVehicle() {
    return massEmptyVehicle + ((engineMass + (engineMass - fuelMass) )/ 2);  //Formula to calculate Average mass 
}//method

public double theVehiclesMaximumVelocity() { //Formula to calculate Maximum velocity
    return totalImpulse / getTheAverageMassOfTheVehicle();
}//method



//Returns - GET
public double getTheAverageMassOfTheVehicle() {
    return theAverageMassOfTheVehicle;
}//method

public double getTheVehiclesMaximumVelocity() {
    return theVehiclesMaximumVelocity;
}//method

}//class

//主要课程

public class Main { //Master class


        public static void main( String args[] ) //Standard header for main method
        {



        kbentry input = new kbentry();

        System.out.print("\nPlease enter a number for Total Impulse: " );
        System.out.println("You have entered : " +input.input1());


        System.out.print("\nPlease enter a number for Average Impulse: " );
        System.out.println("You have entered : " +input.input2());

        System.out.print("\nPlease enter a number for Time ejection charge fires: " );
        System.out.println("You have entered : " +input.input3());

        System.out.print("\nPlease enter a number for the Mass of the vehicle: " );
        System.out.println("You have entered : " +input.input4());

        System.out.print("\nPlease enter a number for the Mass of the engine: " );
        System.out.println("You have entered : " +input.input5());

        System.out.print("\nPlease enter a number for the Mass of the fuel: " );
        System.out.println("You have entered : " +input.input6());

        //Output

        CalculatingRocketFlightProfile calculations = new CalculatingRocketFlightProfile();


        System.out.println("\nThe average mass of the vehicle: " +calculations.theAverageMassOfTheVehicle() +
                           "\nThe vehicles maximum velocity: " + calculations.theVehiclesMaximumVelocity());

        }
        }

// kbentry

public class kbentry{

double input1(){

BufferedReader in = new BufferedReader(new InputStreamReader(System.in));

//Total Impulse entry
String strTotalImpulse = null;  // These must be initialised
int    intTotalImpulse = 0;

//System.out.print("Please enter a number for Total Impulse: ");
//System.out.flush();

// read string value from keyboard
try {
  strTotalImpulse = in.readLine();
} 
catch (IOException ioe) { 
  // ignore exception
       }

// convert it to integer
try {
  intTotalImpulse = Integer.parseInt(strTotalImpulse);
} 
catch (NumberFormatException nfe) {
   System.out.println("Error! Please enter a number!" + nfe.toString());

}

Answer 1

问题在于您需要CalcultingRocketFlightProfile类需要参数，但是您在不将任何参数传递给新的CalcultingRocketFlightProfile的情况下创建计算。

您应该将这些输入存储在变量中，然后将这些变量传递给您声明的新CalcultingRocketFlightProfile中的构造函数。

Answer 2

好吧，首先，您实际上并没有将任何输入传递给Calculations类。我不确定input.input1（）是什么，或者你有一个你没有发布的输入类。无论哪种方式，您都可以通过几种不同的方式来实现

首先，请为输入变量指定一个有意义的名称，以便了解您正在处理哪些变量。然后传递你的所有输入。

CalculatingRocketFlightProfile calculation = new CalculatingRocketFlightProfile（input1，input2等）

或

将所有输入变量放入计算类中。然后将用户输入存储为calculate.totalImpulse等...然后调用计算方法显示答案。

- 编辑 -

只有2个课程，主要课程和计算课程。不需要另一个类来处理键盘输入。

实施例

主要课程

public class Main { 

    public static void main( String args[] ) {

        Scanner keyboard = new Scanner(System.in); 

        CalculatingRocketFlightProfile calculations = new CalculatingRocketFlightProfile();

        System.out.print("\nPlease enter a number for Total Impulse: " );
        calculations.totalImpulse = keyboard.nextDouble(); 
        System.out.println("You have entered : " + calculations.totalImpulse);
    }
}

public class CalculatingRocketFlightProfile { //Calculation class

//Declaring fields
public double totalImpulse ;

// Do all of your maths, and methods for answer return
}

您实际上并未使用键盘输入并将其分配给任何内容。使用扫描仪对象，您可以将输入分配给计算类中的变量。如果你为所有这些做到这一点，你实际上并不需要计算类中的构造函数，只需用它来完成所有数学运算并返回答案。

调用添加输入的方法

2 个答案: