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Thread: Need help on Java program

  1. #1
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    Default Need help on Java program

    I have an assignment for my java class. Here is the assignment followed by the code I have done so far. Any help would be greatly appreciated.

    1. Expand the class Inventory, developed in the previous part of the project, by doing the following:


    • Providing “pop-up” windows to ask for the names of the input and output files. Do this in the constructor; in other words, save the output file name for the finalizer.
    • Handle any exceptions that might be generated in the class.


    2. Create another program to make use of the class Inventory. The options – (1) modify the information for a part, (2) list the parts, (3) list the parts needing to be reordered, or (4) add a new part – should be menu driven. The “reports” (displays) should be neatly formatted. Your grade will be based on how well the program works and if it is “user friendly” – not how fancy the windows (if any) are.


    Turn in the two files – the Inventory class file and the main program file.


    Here is my code for the Inventory class file.

      import java.io.*;
       import java.util.*;
     
       class InventoryExample{
          static int SIZE = 100;	// Max. size for arrays
          int partNum[];
          int quantity[];
          double cost[];
          double wholesaleCost[];
          int reorderQuantity[];
          String description[];
          int invCnt;
          private PrintWriter op;
     
       //constructor
          public InventoryExample() throws FileNotFoundException {
             partNum = new int[SIZE];
             quantity = new int [SIZE];
             cost = new double[SIZE];
             wholesaleCost = new double[SIZE];
             reorderQuantity = new int[SIZE];
             description = new String[SIZE];
             invCnt = 0;
     
    	  // Get filename and create the file
             FileWriter writer = null;
             BufferedReader user = new BufferedReader(
                new InputStreamReader( System.in ) );
             String fileName = "";
     
             System.out.print("Enter Filename-->"); System.out.flush();
             try
             {
                fileName = user.readLine().trim();
                writer = new FileWriter( fileName );
             }
                catch ( IOException iox )
                {
                   System.out.println("Error in creating file");
                   return;
                }	
     
          }
     
       //method to add a new part, cost, and quantity
          public void addPart(int pn, int q, double c, double wc, int rq, String d){
             for(int i=0; i<invCnt; i++)
                if(partNum[i] == pn) 
                   return; // part already exits
          // otherwise, add part to data base	
             partNum[invCnt]=pn;
             quantity[invCnt]=q;
             cost[invCnt]=c;
             wholesaleCost[invCnt] = wc;
             reorderQuantity[invCnt] = rq;
             description[invCnt] = d;
             invCnt++;
          }
     
       //method to return the quantity of part 'pn' in stock
          public int getQuantity(int pn){
             for(int i=0;i<invCnt;i++){
                if(partNum[i]==pn) 
                   return quantity[i];
             }
             return -1;	// failure to find part
          }
     
       //method to return the cost of part 'pn'
          public double getCost(int pn){
             for(int i=0;i<invCnt;i++){
                if(partNum[i]==pn) 
                   return cost[i];
             }
             return -1;	// failure to find part
          }
     
       //method to return the wholesale cost of part 'pn'
          public double getWholesale(int pn){
             for(int i=0;i<invCnt;i++){
                if(partNum[i]==pn) 
                   return wholesaleCost[i];
             }
             return -1;	// failure to find part
          }
     
       //method to return the reorder point of part 'pn'
          public int getReorder(int pn){
             for(int i=0;i<invCnt;i++){
                if(partNum[i]==pn) 
                   return reorderQuantity[i];
             }
             return -1;	// failure to find part
          }
     
       //method to return the description of part 'pn'
          public String getDescription(int pn){
             for(int i=0;i<invCnt;i++){
                if(partNum[i]==pn) 
                   return description[i];
             }
             return "Not Found";	// failure to find part
          }
     
       //Accessors
       //method to set the quantity of part 'pn' in stock
          public void setQuantity(int pn, int quant){
             for(int i=0;i<invCnt;i++){
                if(partNum[i]==pn)  quantity[i] = quant;
             }
          	// failure to find part, nothing happens
          }
     
       //method to set the cost of part 'pn' in stock
          public void setCost(int pn, double amnt){
             for(int i=0;i<invCnt;i++){
                if(partNum[i]==pn)  cost[i] = amnt;
             }
          	// failure to find part, nothing happens
          }
     
       //method to set the wholesale cost of part 'pn' in stock
          public void setWholesale(int pn, double amnt){
             for(int i=0;i<invCnt;i++){
                if(partNum[i]==pn)  wholesaleCost[i] = amnt;
             }
          	// failure to find part, nothing happens
          }
     
       //method to set the reorder point of part 'pn' in stock
          public void setReorder(int pn, int num){
             for(int i=0;i<invCnt;i++){
                if(partNum[i]==pn)  reorderQuantity[i] = num;
             }
          	// failure to find part, nothing happens
          }
     
       //method to change the description of part 'pn' in stock
          public void setDescription(int pn, String str){
             for(int i=0;i<invCnt;i++){
                if(partNum[i]==pn)  description[i] = str;
             }
          	// failure to find part, nothing happens
          }
     
     
       //finalizer, 
          public void finalize(){
             for (int i=0; i<invCnt; i++) {
                op.print(partNum[i]+" ");
                op.print(quantity[i]+" ");
                op.print(cost[i]+" ");
                op.print(wholesaleCost[i]+" ");
                op.print(reorderQuantity[i]+" ");
                op.println(description[i]);
             }
             op.println("-1 0 0 0 0 Last Line");
             op.close();
          }
       }

    I believe that I have the input file part correct and the output part correct too. The inventory class does compile without any errors but I haven't been able to test it yet because I cannot get a test program to compile and work. This is where I start having a lot of the trouble. I will post what I have so far and the errors that I get when I compile. Please keep the laughter to a minimum as I am very new to this.

     import java.text.NumberFormat;
     
       class InventoryTest {
          public static void main(String args[])
          {
     
          // creates new inventory
             InventoryExample = new InventoryExample( );
     
          // add the software to the inventory
     
             getDescription = new InventoryExample("Part");
             InventoryExample.addpart(description);
     
             getWholesale = new InventoryExample("10");
             InventoryExample.addpart(description);
     
             getCost = new InventoryExample("10");
             InventoryExample.addpart(description);
     
             getQuantity = new InventoryExample("10");
             InventoryExample.addpart(description);
     
             getReorder = new InventoryExample("10");
             InventoryExample.addpart(description);
     
          // sort by sftitle
             InventoryExample.sortproduct( );
     
          // prints inventory
             for (int i = 0; i < InventoryExample.getproductCount(); i++) {
                System.out.println(InventoryExample.getproduct(i));
                System.out.println();
             }
          }
       }

    Here are the compile errors that I am getting.


    ----jGRASP exec: javac -g InventoryTest.java
    InventoryTest.java:12: cannot find symbol
    symbol : variable InventoryExample
    location: class InventoryTest
    InventoryExample = new InventoryExample( );
    ^
    InventoryTest.java:16: cannot find symbol
    symbol : variable getDescription
    location: class InventoryTest
    getDescription = new InventoryExample("Part");
    ^
    InventoryTest.java:16: cannot find symbol
    symbol : constructor InventoryExample(java.lang.String)
    location: class InventoryExample
    getDescription = new InventoryExample("Part");
    ^
    InventoryTest.java:17: cannot find symbol
    symbol : variable description
    location: class InventoryTest
    InventoryExample.addpart(description);
    ^
    InventoryTest.java:19: cannot find symbol
    symbol : variable getWholesale
    location: class InventoryTest
    getWholesale = new InventoryExample("10");
    ^
    InventoryTest.java:19: cannot find symbol
    symbol : constructor InventoryExample(java.lang.String)
    location: class InventoryExample
    getWholesale = new InventoryExample("10");
    ^
    InventoryTest.java:20: cannot find symbol
    symbol : variable description
    location: class InventoryTest
    InventoryExample.addpart(description);
    ^
    InventoryTest.java:22: cannot find symbol
    symbol : variable getCost
    location: class InventoryTest
    getCost = new InventoryExample("10");
    ^
    InventoryTest.java:22: cannot find symbol
    symbol : constructor InventoryExample(java.lang.String)
    location: class InventoryExample
    getCost = new InventoryExample("10");
    ^
    InventoryTest.java:23: cannot find symbol
    symbol : variable description
    location: class InventoryTest
    InventoryExample.addpart(description);
    ^
    InventoryTest.java:25: cannot find symbol
    symbol : variable getQuantity
    location: class InventoryTest
    getQuantity = new InventoryExample("10");
    ^
    InventoryTest.java:25: cannot find symbol
    symbol : constructor InventoryExample(java.lang.String)
    location: class InventoryExample
    getQuantity = new InventoryExample("10");
    ^
    InventoryTest.java:26: cannot find symbol
    symbol : variable description
    location: class InventoryTest
    InventoryExample.addpart(description);
    ^
    InventoryTest.java:28: cannot find symbol
    symbol : variable getReorder
    location: class InventoryTest
    getReorder = new InventoryExample("10");
    ^
    InventoryTest.java:28: cannot find symbol
    symbol : constructor InventoryExample(java.lang.String)
    location: class InventoryExample
    getReorder = new InventoryExample("10");
    ^
    InventoryTest.java:29: cannot find symbol
    symbol : variable description
    location: class InventoryTest
    InventoryExample.addpart(description);
    ^
    InventoryTest.java:32: cannot find symbol
    symbol : method sortproduct()
    location: class InventoryExample
    InventoryExample.sortproduct( );
    ^
    InventoryTest.java:35: cannot find symbol
    symbol : method getproductCount()
    location: class InventoryExample
    for (int i = 0; i < InventoryExample.getproductCount(); i++) {
    ^
    InventoryTest.java:36: cannot find symbol
    symbol : method getproduct(int)
    location: class InventoryExample
    System.out.println(InventoryExample.getproduct(i)) ;
    ^
    19 errors



    Basically I think it would be easier to scrap the test file and start new. Thanks for any help in advance guys!!!


  2. #2
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    Default Re: Need help on Java program

    Is the compiled InventoryExample.class file in the same directory as the InventoryTest?

  3. #3
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    Default Re: Need help on Java program

    Yes the InventoryExample.java file is in the same directory

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