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以下は、エラーが発生するテストコードですPizza order = new Pizza(); Pizza.classをPizzaorder.classファイルにインポートしなかったと思います。誰もがこのエラーを修正するのに役立つことができます。Javaでユーザー定義クラスをインポートする
コードが続きます。
Pizza.java
package pizza;
public class Pizza {
private double cost; //the cost of the pizza
private String crust; //the type of crust
private int size; //the diameter in inches
private int numToppings; //the number of toppings
private String toppingList; //a list of the toppings
public static void main(String[] args) {
}
public Pizza()
{
cost = 12.99;
crust = "Hand-tossed";
size = 12;
numToppings = 0;
toppingList = null;
}
public void setCost (double amount)
{
cost += amount;
}
public void setCrust (String type)
{
crust = type;
}
public void setSize (int diameter)
{
size = diameter;
}
public void setNumToppings(int number)
{
numToppings = number;
}
public void setToppingList (String newTopping)
{
toppingList = newTopping;
}
public double getCost()
{
return cost;
}
public String getCrust()
{
return crust;
}
public int getSize()
{
return size;
}
public int getNumToppings()
{
return numToppings;
}
public String getToppingList()
{
return toppingList;
}
}
PizzaOrder.java
package pizza;
import java.util.Scanner;
public class PizzaOrder {
public static void main (String [] args)
{
Scanner keyboard = new Scanner (System.in);
Pizza order = new Pizza();
String firstName;
boolean discount = false;
int inches;
char crustType;
double cost;
final double TAX_RATE = .08;
double tax;
char choice;
String input;
String toppings = "Cheese ";
int numberOfToppings = 0;
System.out.println("Welcome to Abdul and " +
"Diane’s Pizza");
System.out.print("Enter your first name: ");
firstName = keyboard.nextLine();
System.out.println("Pizza Size (inches) Cost");
System.out.println(" 10 £10.99");
System.out.println(" 12 £12.99");
System.out.println(" 14 £14.99");
System.out.println(" 16 £16.99");
System.out.println("What size pizza would you like?");
System.out.print("10, 12, 14, or 16 " + "(enter the number only): ");
inches = keyboard.nextInt();
keyboard.nextLine();
System.out.println("What type of crust do you want? ");
System.out.print(
"(H)Hand-tossed, (T) Thin-crust, or " +
"(D) Deep-dish (enter H, T, or D): ");
input = keyboard.nextLine();
crustType = input.charAt(0);
System.out.println("All pizzas come with cheese.");
System.out.println(
"Additional toppings are £1.25 each,"
+ " choose from");
System.out.println(
"Pepperoni, Sausage, Onion, Mushroom");
System.out.print("Do you want Pepperoni? (Y/N): ");
input = keyboard.nextLine();
choice = input.charAt(0);
if (choice == 'Y' || choice == 'y')
{
numberOfToppings += 1;
toppings = toppings + "Pepperoni ";
}
System.out.print("Do you want Sausage? (Y/N): ");
input = keyboard.nextLine();
choice = input.charAt(0);
if (choice == 'Y' || choice == 'y')
{
numberOfToppings += 1;
toppings = toppings + "Sausage ";
}
System.out.print("Do you want Onion? (Y/N): ");
input = keyboard.nextLine();
choice = input.charAt(0);
if (choice == 'Y' || choice == 'y')
{
numberOfToppings += 1;
toppings = toppings + "Onion ";
}
System.out.print("Do you want Mushroom? (Y/N): ");
input = keyboard.nextLine();
choice = input.charAt(0);
if (choice == 'Y' || choice == 'y')
{
numberOfToppings += 1;
toppings = toppings + "Mushroom ";
}
order.setNumToppings (numberOfToppings);
order.setToppingList(toppings);
order.setCost(1.25*numberOfToppings);
System.out.println();
System.out.println("Your order is as follows: ");
System.out.println(order.getSize() + " inch pizza");
System.out.println(order.getCrust() + " crust");
System.out.println(order.getToppingList());
cost = order.getCost();
System.out.println("The cost of your order is: £" +
cost);
tax = cost * TAX_RATE;
System.out.println("The tax is: £" + tax);
System.out.println("The total due is: £" +
(tax+cost));
System.out.println("Your order will be ready" +
" for pickup in 30 minutes.");
}
}
エラー：
C:\Users\Meutex\Documents\Netbeans projects>javac PizzaOrder.java
PizzaOrder.java:23: error: cannot find symbo
追加のエラー。
C:\Users\Meutex\Documents\Netbeans projects\Pizza>java Pizza.PizzaOrder
Exception in thread "main" java.lang.NoClassDefFoundError: Pizza/PizzaOrder (wro
ng name: pizza/PizzaOrder)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:14
2)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:472)
のような名前を付けてください。どうしてそんな問題があると思いますか？どのようなエラー/問題がありますか？ – Mat
私は私の質問を編集してそれを徹底的に行ってください。 –
質問には関係ありませんが、Javaでは、関数の最初の行ですべての変数を宣言する必要はありません。通常は、変数を最初に使用された場所にできるだけ近いものとして宣言することをお勧めします。 [あなたのコードの 'main（）'の変数 'tax'や' cost'などの例） – amit