参数不能解析为变量？

Question

这是一个相当基本的程序。 当我尝试打印summaryOutput方法和billOutput方法时，出现错误，提示无法将参数解析为变量。

public class PizzaDriver{

    public static void main(String[] args) {
          PizzaOrder order = new PizzaOrder(); 
          PizzaOutput output = new PizzaOutput();
          PizzaInput input = new PizzaInput(); 

          System.out.println(output.menuOutput()); 
          input.readInput(order); 

          System.out.println(summaryOutput1 = output.summaryOutput (numCheese, numPepperoni, numSausage, numVegetarian));
          System.out.println(output.billOutput(String billOutput));
    }
}

公共类PizzaOutput {

public String menuOutput()
{
    String menuOutput1 = "Item        \t Price \nCheese  \t $2.40 \n Sausage \t $3.00 \nPepperoni \t $3.00 \nVegertarian \t $3.00";

    return menuOutput1;

}

public void summaryOutput(int numCheese,int numPepperoni,int numSausage,int numVegetarian)
{
    System.out.println("Cheese: " + numCheese); 

    System.out.println("Pepperoni: " + numPepperoni); 

    System.out.println("Sausage: " + numSausage);

    System.out.println("Vegetarian: " + numVegetarian);


}

public void billOutput(double subTotal, double tax, double carryOut, double totalBill)
{
    System.out.println("Subtotal : " +subTotal);

    System.out.println("Tax : " + tax);

    System.out.println("carryOut : " +carryOut);

    System.out.println("Total Bill: " + totalBill);
}

导入java.util.Scanner;

公共类PizzaInput {扫描仪键盘=新的Scanner（System.in）;

public int numCheese, numPepperoni, numSausage, numVegetarian; 



public void readInput(PizzaOrder order)
{
    System.out.print("How many Cheese Pizzas would you like?");
    int numCheese = keyboard.nextInt(); 

    order.setCheese(numCheese); 

    System.out.print("How many Pepperoni pizzas would you like?");
    int numPepeperoni = keyboard.nextInt(); 

    order.setPepperoni(numPepperoni);

    System.out.print("How many Sausage pizzas would you like?");
    int numSausage = keyboard.nextInt(); 

    order.setSausage(numSausage);

    System.out.print("How many Vegetarian pizzas would you like?");
    int numVegetarian = keyboard.nextInt(); 

    order.setVegetarian(numVegetarian);



    }

}

公共类PizzaOrder {私有最终双倍CHEESE_PRICE = 2.40;

private final double PEPPERONI_PRICE = 3.00;

private final double SAUSAGE_PRICE = 3.00;

private final double VEGETARIAN_PRICE = 3.50; 

private final double SALES_TAX = .025; 

private final double CARRY_OUT = .10; 


public int numCheese, numPepperoni, numSausage, numVegetarian; 


public int getCheese()
{
    return numCheese; 
}

public void setCheese(int numCheese)
{
    this.numCheese=numCheese;
}


public int getPepperoni()
{
    return numPepperoni; 
}

public void setPepperoni(int numPepperoni)
{
    this.numPepperoni=numPepperoni; 
}


public int getSausage()
{
    return numSausage; 
}

public void setSausage(int numSausage)
{
    this.numSausage= numSausage; 
}

public int getVegetarian()
{
    return numVegetarian; 
}

public void setVegetarian(int numVegetarian)
{
    this.numVegetarian = numVegetarian; 
}






public double calculateSubTotal()
{
    double cheeseTotal= numCheese * CHEESE_PRICE; 

    double pepperoniTotal = numPepperoni * PEPPERONI_PRICE; 

    double sausageTotal = numSausage * SAUSAGE_PRICE; 

    double vegetarianTotal = numVegetarian * VEGETARIAN_PRICE; 

    double subTotal = cheeseTotal + pepperoniTotal + sausageTotal + vegetarianTotal; 

    double tax = (subTotal) * SALES_TAX; 

    double totalBill = (tax + subTotal) * CARRY_OUT; 

    return totalBill; 

}

}

Answer 1

当你说跟随

output.summaryOutput (numCheese, numPepperoni, numSausage, numVegetarian)

它将尝试在当前方法/类中搜索相同的变量名（ numCheese ， numPepperoni ， numSausage ， numVegetarian ），这些变量名未定义，因此无法确定。

请定义这些内容，否则请正确引用

也没有为summaryOutput1和@pooja建议定义

System.out.println(output.billOutput(String billOutput));//where is the param billOutput?

应该像

System.out.println(output.billOutput(billOutput));

Answer 2

在调用方法而不是定义方法时，请从以下行中删除“ String ”。 此外， billOutput已经两次。 避免名称冲突。

System.out.println(output.billOutput(String billOutput));

Answer 3

仔细阅读以下代码集，并确定在应用程序内部必须执行的更改

public class PizzaOutput {

    private int numCheese;
    private int numPepperoni;
    private int numSausage;
    private int numVegetarian;

    public PizzaOutput(){}

    public PizzaOutput(int numSausage, int numCheese, int numPepperoni, int numVegetarian) {
        this.numSausage = numSausage;
        this.numCheese = numCheese;
        this.numPepperoni = numPepperoni;
        this.numVegetarian = numVegetarian;
    }

    public int getNumCheese() {
        return numCheese;
    }

    public void setNumCheese(int numCheese) {
        this.numCheese = numCheese;
    }

    public int getNumPepperoni() {
        return numPepperoni;
    }

    public void setNumPepperoni(int numPepperoni) {
        this.numPepperoni = numPepperoni;
    }

    public int getNumSausage() {
        return numSausage;
    }

    public void setNumSausage(int numSausage) {
        this.numSausage = numSausage;
    }

    public int getNumVegetarian() {
        return numVegetarian;
    }

    public void setNumVegetarian(int numVegetarian) {
        this.numVegetarian = numVegetarian;
    }

    public String summaryOutput(int numSausage, int numCheese, int numPepperoni, int numVegetarian){
        setNumSausage(numSausage);
        setNumCheese(numCheese);
        setNumPepperoni(numPepperoni);
        setNumVegetarian(numVegetarian);

        return "Sausage : "+ getNumSausage()+ "  Cheese : "+getNumCheese()+ " Pepeeroni : "+ getNumPepperoni()+ " Vegetarian : "+getNumVegetarian();
    }

    public String billOutPut(String bOutput){
        // Enter here your code to get the bill
        return "Bill Output"; // return the bill as a String
    }
}

->注意实例变量的声明
->您尚未在“ summaryOutput”和“ billOutPut”方法中声明return语句。 因此，您必须将return语句声明为单个语句
->根据您的代码结构，调用这两个方法足以获取输出，而无需在SOP中调用这两个方法