// Inventory.java part 1
// this program is to calculate the value of the inventory of the Electronics Department's cameras
import java.util.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
public class Inventory
{
public void main(String[] args)
{
// create Scanner to obtain input from the command window
Scanner input = new Scanner (System.in);
int itemNumber; // first number to multiply
int itemStock; // second number to multiply
double itemPrice; //
double totalValue; // product of number1 and number2
while(true){ // infinite loop
// make new Camera object
Cam camera = new Cam(name, itemNumber, itemStock, itemPrice, totalValue);
System.out.print("Enter Department name: "); //prompt
String itemDept = input.nextLine(); // read name from user
if(itemDept.equals("stop")) // exit the loop
break;
while(true){
System.out.print("Enter item name: "); // prompt
String name = input.nextLine(); // read first number from user
input.nextLine();
if(name != ("camera"))
System.out.print("Enter valid item name:"); // prompt
name = input.nextLine(); // read first number from user
input.nextLine();
break;
}
System.out.print("Enter number of items on hand: "); // prompt
itemStock = input.nextInt(); // read first number from user
input.nextLine();
while( itemStock <= -1){
System.out.print("Enter positive number of items on hand:"); // prompt
itemStock = input.nextInt(); // read first number from user
input.nextLine();
} /* while statement with the condition that negative numbers are entered
user is prompted to enter a positive number */
System.out.print("Enter item Price: "); // prompt
itemPrice = input.nextDouble(); // read second number from user
input.nextLine();
while( itemPrice <= -1){
System.out.print("Enter positive number for item price:"); // prompt
itemPrice = input.nextDouble(); // read first number from user
input.nextLine();
} /* while statement with the condition that negative numbers are entered
user is prompted to enter a positive number */
totalValue = itemStock * itemPrice; // multiply numbers
System.out.println("Department name:" + itemDept); // display Department name
System.out.println("Item number: " + camera.getItemNumber()); //display Item number
System.out.println("Product name:" + camera.getName()); // display the item
System.out.println("Quantity: " + camera.getItemStock());
System.out.println("Price per unit" + camera.getItemPrice());
System.out.printf("Total value is: $%.2f\n", camera.getTotalValue()); // display product
} // end while method
} // end method main
}/* end class Inventory */
class Cam{
private String name;
private int itemNumber;
private int itemStock;
private double itemPrice;
private String deptName;
private Cam(String name, int itemNumber, int itemStock, double itemPrice, double totalValue) {
this.name = name;
this.itemNumber = itemNumber;
this.itemStock = itemStock;
this.itemPrice = itemPrice;
this.totalValue = totalValue;
}
public String getName(){
return name;
}
public double getTotalValue(){
return itemStock * itemPrice;
}
public int getItemNumber(){
return itemNumber;
}
public int getItemStock(){
return itemStock;
}
public double getItemPrice(){
return itemPrice;
}
}
これは、このコードをコンパイルしようとしたときの出力です。
C:\Java>javac Inventory.java
Inventory.java:25: error: cannot find symbol
Cam camera = new Cam(name, itemNumber, itemStock, itemPrice, totalValue);
^
symbol: variable name
location: class Inventory
Inventory.java:98: error: cannot find symbol
this.totalValue = totalValue;
^
symbol: variable totalValue
2 errors
これらのエラーが発生し続ける理由がわかりません。問題の解決に近づいているように感じますが、この問題を少しでも乗り越えるには助けが必要であることがわかりました。
さて、いくつかの変更を加えましたが、次のエラーが表示されます。
C:\Java>javac Inventory.java
Inventory.java:68: error: variable itemNumber might not have been initialized
Cam camera = new Cam(name, itemNumber, itemStock, itemPrice, totalValue);
^
Inventory.java:68: error: variable totalValue might not have been initialized
Cam camera = new Cam(name, itemNumber, itemStock, itemPrice, totalValue);
^
2 errors