Question

Eclipse在我的“Vehicle class”中显示错误“Vehicle的基本类型字节没有字段PASSENGER_CAR”。这是什么意思？这是我们必须在课堂上使用的JUnit测试中唯一的错误。当我写“7”或“5”这些类型的常量似乎工作，但我不允许这样做。这是完整的计划：

public class Vehicle {

public static final float TANK_SIZE_PASSENGER_CAR = 40.f;
public static final float TANK_SIZE_TRUCK = 80.f;
private float fuel;
private  float VehicleType;


public Vehicle(){

}

public Vehicle(byte VehicleType){

    this();
    if (VehicleType == VehicleType.PASSENGER_CAR){
        this.VehicleType= VehicleType.PASSENGER_CAR ;
        this.fuel= Vehicle.TANK_SIZE_PASSENGER_CAR;
    }

    if(VehicleType == VehicleType.TRUCK){
        this.VehicleType= VehicleType.TRUCK;
        this.fuel= Vehicle.TANK_SIZE_TRUCK;
    }

    public float getFuel(){
        return fuel;
    }
    public byte getVehicleType(){
        return VehicleType;


    }

}

}

public final class VehicleType {

public static final byte PASSENGER_CAR = 7;

public static final byte TRUCK = 5;


/**
 * This class is just an organizer for the above constants; Not instantiable.
 */
private VehicleType(){

}

}

public class CarTrader {

public static final float CAPACITY_DIESEL_LITERS = 250.f;
public static final float CAPACITY_GAS_LITERS = 180.f;
public static final int CAPACITY_PASSENGER_CARS = 15;
public static final int CAPACITY_TRUCKS = 5;


float gasStockLiters=180.f;
float dieselStockLiters=250.f;
int passengerCarsStock=15;
int trucksStock=5;

void setGasStockLiters(float gasStockLiters){
    this.gasStockLiters=gasStockLiters;
}

void setDieselStockLiters(float dieselStockLiters){
    this.dieselStockLiters=dieselStockLiters;
}

void setPassengerCarsStock(int passengerCarsStock){
    this.passengerCarsStock=passengerCarsStock;
}

void setTrucksStock(int trucksStock){
    this.trucksStock=trucksStock;
}

int getPassengerCarsStock(){
    return passengerCarsStock;
}

int getTrucksStock(){
    return trucksStock;
}
float getGasStockLiters(){
    return gasStockLiters;
}
float getDieselStockLiters(){
    return dieselStockLiters;
}



public Vehicle sellVehicle(byte vehicleType){

Vehicle soldVehicle=null;


    switch (vehicleType){



    case 0: //VehicleType.TRUCK: 

        if(this.dieselStockLiters>=Vehicle.TANK_SIZE_TRUCK && this.trucksStock>=1){

            trucksStock = trucksStock - 1;
            dieselStockLiters = dieselStockLiters - Vehicle.TANK_SIZE_PASSENGER_CAR;
            soldVehicle = new Vehicle(VehicleType.TRUCK);
            System.out.println("LKW erfolgreich verkauft");

        }
            else{
                soldVehicle=null;
            }

        break;

    case 1://VehicleType.PASSENGER_CAR:

        if(gasStockLiters>=Vehicle.TANK_SIZE_PASSENGER_CAR && this.passengerCarsStock>=1){

            passengerCarsStock = passengerCarsStock - 1;
            gasStockLiters = gasStockLiters - Vehicle.TANK_SIZE_PASSENGER_CAR;

            soldVehicle = new Vehicle(VehicleType.PASSENGER_CAR);
            System.out.println("PKW erfolgreich verkauft");

    }
        else{
            soldVehicle=null;
        }

    break;

    default:

        break;
}
    return soldVehicle;

}

public Vehicle[] sellVehicles(byte vehicleType, int amount){

    Vehicle[] soldVehicles = new Vehicle[amount];
    float currentAmount=40*amount;
    float currentAmount2=80*amount;



    switch (vehicleType){


    case 0://VehicleType.TRUCK: 

        if(this.dieselStockLiters>=currentAmount2 && this.trucksStock>=amount){

            trucksStock = trucksStock - amount;
            dieselStockLiters = dieselStockLiters - (currentAmount2);

            for (int i=0; i<amount; i++){

                soldVehicles[i]=new Vehicle(VehicleType.TRUCK);
            }


            System.out.println("LKW erfolgreich verkauft");

        }
            else{
                soldVehicles=null;
            }

        break;




    case 1://VehicleType.PASSENGER_CAR:


        if(this.gasStockLiters>=currentAmount && this.passengerCarsStock>=amount){

            passengerCarsStock = passengerCarsStock - amount;
            gasStockLiters = gasStockLiters - (currentAmount);

            for (int i=0; i<amount; i++){

                soldVehicles[i]=new Vehicle(VehicleType.PASSENGER_CAR);
            }

            System.out.println("PKW erfolgreich verkauft");

    }
        else{
            soldVehicles=null;
        }

    break;

    default:
        soldVehicles=null;
        break;
    }


    return soldVehicles;
}


public boolean fillGas(float gas){

    boolean filled=false;

    if((gasStockLiters + gas)<=CarTrader.CAPACITY_GAS_LITERS){

        gasStockLiters = gasStockLiters + gas;
        filled=true;
    }
        else{
            System.err.println("Die Kapazität beträgt höchstens 180 Liter");
        }
    return filled;
    }

public boolean fillDiesel(float diesel){

    boolean  filled2=false;

    if((dieselStockLiters + diesel)<=CarTrader.CAPACITY_DIESEL_LITERS){

        dieselStockLiters = dieselStockLiters + diesel; 
        filled2=true;
    }

        else{
            System.err.println("Die Kapazität beträgt höchstens 250 Liter");
        }
    return filled2;
}

public boolean reorderVehicles(byte vehicle, int amountVehicles){

    boolean full=false;

    if (vehicle==1){

        if ((trucksStock + amountVehicles)<=CarTrader.CAPACITY_TRUCKS){

            trucksStock = trucksStock + amountVehicles;
            full=true;
        }

    }

    if (vehicle==0){

        if ((passengerCarsStock + amountVehicles)<=CarTrader.CAPACITY_PASSENGER_CARS){

            passengerCarsStock = passengerCarsStock + amountVehicles;
            full=true;
        }

    }
        else {
            System.out.println("Bitte 5 oder 7 wählen");
        }
    return full;
    }

void statusOutput()
{
    System.out.println("AutoHändler - Lagerbestand:");
    System.out.println("    PKW: " + passengerCarsStock);
    System.out.println("    - Benzin: " + gasStockLiters);
    System.out.println("    LKW: " + trucksStock);
    System.out.println("    - Diesel: " + dieselStockLiters);
}

}

Answer 1

你有一个名为VehicleType的类，一个名为VehicleType的浮点数，并将一个名为VehicleType的字节传入函数。将您的Vehicle初始化程序更改为public Vehicle(byte vehicleType)，错误应该消失，停止命名所有内容VehicleType。

public class Vehicle {
    public static final float TANK_SIZE_PASSENGER_CAR = 40.f;
    public static final float TANK_SIZE_TRUCK = 80.f;
    private float fuel;
    private float mVehicleType;

    public Vehicle(){}

    public Vehicle(byte vehicleType){
        this();
        if (vehicleType == VehicleType.PASSENGER_CAR){
            this.mVehicleType= VehicleType.PASSENGER_CAR ;
            this.fuel= Vehicle.TANK_SIZE_PASSENGER_CAR;
        }

        if(vehicleType == VehicleType.TRUCK){
            this.mVehicleType= VehicleType.TRUCK;
            this.fuel= Vehicle.TANK_SIZE_TRUCK;
        }
    }

    public float getFuel(){
        return this.fuel;
    }

    public byte getVehicleType(){
        return this.mVehicleType;
    }
}

Answer 2

@popdemic这是第4行中的错误（assertEquals（40.f ....）

 private void testSoldCarAttributes(byte vehicleType, final Vehicle v) {
    switch (vehicleType) {
        case VehicleType.PASSENGER_CAR:
            assertEquals(40.f, v.getFuel(), DELTA_FLOAT);
            assertEquals(VehicleType.PASSENGER_CAR, v.getVehicleType());
            break;
        case VehicleType.TRUCK:
            assertEquals(80.f, v.getFuel(), DELTA_FLOAT);
            assertEquals(VehicleType.TRUCK, v.getVehicleType());
    }

并在第二行testSoldCarAttributes（VehicleType.PASSENGER_CAR .....

 public void testSoldCarAttributes() {
    testSoldCarAttributes(VehicleType.PASSENGER_CAR, trader.sellVehicle(VehicleType.PASSENGER_CAR));
    testSoldCarAttributes(VehicleType.TRUCK, trader.sellVehicle(VehicleType.TRUCK));

Cartrader计划。 1 Junit错误，但我不明白

2 个答案: