Question

Java code for creating an Inventory Management System of any company

- designing the data structure(stack, queue, list, sort list, array, array list or linked list) (be flexible for future company growth

Java code for creating an initial list in a structure. Use Array (or ArrayList) or Linkedlist structure whichever you are confident to use. - Implement Stack, Queue, List type structure and proper operation for your application. Do not use any database. All data must use your data structures.

Minimum requirements of the system but not limited to only these:

Menu

1. Search Product

2. Search Product by other attribute

Menu

1. Show entire inventory

2. Show inventory by Manufacturer/Supplier

3. Show inventory by Type

4. Show inventory by Location

5. List products by price

6. List products by supplier

7. List products by availability

8. Show current discount items

Menu

1. Add record/product/part

2. Remove record

3. Change record

Menu for report

1. {make report - e.g. quantity report}

2. {make report - e.g. statistic report}

3. {Alert - Full or low quantity alerting}

Answer 1

store.java

import java.io.*;
import java.lang.*;

class store
{
        private InputStreamReader ir=new InputStreamReader(System.in);
        private BufferedReader br;
        private FileOutputStream fos;
        private PrintStream ps; 
        private FileReader frs;

        //function to check the existence for a file
        private boolean checkFile(String filename)
        {
                File myFile=new File(filename);
                boolean b=myFile.exists();      

                return b;
        }

        //function for auto-generating the product id
        private String generate_id()
        {
                String id=" ";
                String thisLine;
                String[] fullText = new String[200];
                String[] lastLine=new String[5];
                int counter=0,nid=0,l=0,z=0;

                boolean b=checkFile("Item.txt");

                if(b==false)
                {
                        id="00001";
                }
                else
                {
                        try
                        {
                                frs=new FileReader("Item.txt");
                                br=new BufferedReader(frs);
                                while((thisLine=br.readLine()) != null)
                                {
                                        counter=counter+1;
                                        fullText[counter] = thisLine;
                                }
                                frs.close();
                                lastLine=fullText[counter].split(",");
                                nid=Integer.parseInt(lastLine[0]);
                                nid=nid+1;
                                l=(String.valueOf(nid)).length();
                                z=5-l;
                                for(int i=1;i<=z;i++)
                                {
                                        id=id+"0";      
                                }
                                id=id+String.valueOf(nid);
                                id=id.substring(1);
                        }
                        catch(Exception ex)
                        {
                                System.out.println("Could not generate the Item ID...!");
                        }
                }
                return id;
        }

        //function to add new product
        private void addItem()
        {
                String desc;
                String id;
                double price=0;
                int stock=0,rol=0;

                try
                {
                        id=generate_id();
                        System.out.print("\n Product ID :"+id+"\n");
                        br=new BufferedReader(ir);

                        System.out.print("\n Product Description :");
                        desc=br.readLine();

                        System.out.print("\n Unit Price : Rs.");
                        price=Double.parseDouble(br.readLine());

                        System.out.print("\n Starting stock value :");
                        stock=Integer.parseInt(br.readLine());          

                        System.out.print("\n Re-order Level :");
                        rol=Integer.parseInt(br.readLine());

                        fos=new FileOutputStream("Item.txt",true);
                        ps=new PrintStream(fos);

                        ps.println(id+","+desc+","+price+","+stock+","+rol);
                        fos.close();
                        System.out.println("Successfully added one product...");
                }
                catch(Exception ex)
                {
                        System.out.println("Error in accepting item specifications...");
                }       
        }

        //function to make selling transaction for a specific product
        private void makeTransaction()
        {
                String id,desc,s="y";
                String msg,stock;
                String value[]=new String[5];
                double price=0,amount=0;
                int qty=0;

                try
                {
                        while(s.equals("y"))
                        {
                                br=new BufferedReader(ir);

                                System.out.print("\n Enter Product ID :");
                                id=br.readLine();
                                msg=findProduct(id);
                                if(msg.equals("Product not found..."))
                                {
                                        System.out.print("\n"+msg);
                                        continue;
                                }
                                br=new BufferedReader(ir);
                                value=msg.split(",");
                                if(Integer.parseInt(value[3])==Integer.parseInt(value[4]))
                                {
                                        System.out.println("Product in Re-Order Level.");
                                        System.out.println("Need to generate a purchase order...");
                                        continue;       
                                }
                                desc=value[1];
                                price=Double.parseDouble(value[2]);
                                stock=value[3];

                                if(Integer.parseInt(stock)==0)
                                {
                                        System.out.println("Current stock is NIL...");
                                        System.out.println("Could not process any transaction on this product...");
                                        continue;
                                }

                                System.out.print("\n Qty to sold :");
                                qty=Integer.parseInt(br.readLine());

                                if(qty>Integer.parseInt(stock))
                                {
                                        System.out.println("Out of stock...!");
                                        System.out.println("Could not sell out this product...");
                                        continue;
                                }
                                amount=qty*price;

                                int d=updateStock(id,qty);
                                if(d==1)
                                {
                                        System.out.println("Failed to update the stock...!");   
                                }

                                frs=new FileReader("Item.txt");
                                br=new BufferedReader(frs);

                                while((msg=br.readLine()) != null)
                                {
                                        value=msg.split(",");
                                        if(value[0].equals(id))
                                        {
                                                stock=value[3];
                                                break;
                                        }
                                }

                                fos=new FileOutputStream("Transaction.txt",true);
                                ps=new PrintStream(fos);
                                ps.println(id+","+desc+","+qty+","+amount+","+stock);
                                fos.close();

                                s="n";
                        }
                        System.out.println("Transaction processed successfully...");    
                }
                catch(Exception ex)
                {
                        System.out.println("Could not process the transaction...!");    
                }       
        }

        //function for searching a product in the master file
        private String findProduct(String pID) throws IOException
        {
                int counter=0,i=0,flag=0;
                String s;
                String cline[]=new String[255];
                String cID[]=new String[5];
                String value=" ";

                frs=new FileReader("Item.txt");
                br=new BufferedReader(frs);

                try
                {
                        while((s=br.readLine()) != null)
                        {
                                counter=counter+1;
                                cline[counter]=s;
                                cID=cline[counter].split(",");
                                if(cID[0].equals(pID))
                                {
                                        for(;i<cID.length;i++)
                                        {
                                                value=value+","+cID[i]; 
                                        }
                                        flag=1;
                                        break;
                                }
                        }
                        switch(flag)
                        {
                                case 0:
                                        value="Product not found...";
                                        break;
                                case 1:
                                        value=value.substring(2);
                                        break;                                          
                        }
                }
                catch(Exception ex)
                {
                        System.out.println("Could continue operation on searching the product...!");
                }

                return value;
        }

        //function for updating the value of current stock whenever a specific item is sold out
        private int updateStock(String pID,int qty) throws IOException
        {
                int counter=0,i=0,pos=0;
                String s;
                String cline[]=new String[255];
                String cID[]=new String[5];
                String row[]=new String[5];
                String desc,price,rol;
                int stock=0,status=0;

                try
                {
                        frs=new FileReader("Item.txt");
                        br=new BufferedReader(frs);             

                        while((s=br.readLine()) != null)
                        {
                                counter=counter+1;
                                cline[counter]=s;                       
                                cID=s.split(",");
                                if(cID[0].equals(pID))
                                {
                                        pos=counter;
                                        row=s.split(",");
                                }       
                        }

                        fos=new FileOutputStream("Item.txt",false);
                        ps=new PrintStream(fos);

                        for(i=0;i<cline.length;i++)
                        {                       
                                if(i==pos)
                                {
                                        desc=row[1];
                                        price=row[2];
                                        stock=Integer.parseInt(row[3])-qty;
                                        rol=row[4];
                                        ps.println(pID+","+desc+","+price+","+stock+","+rol);
                                }
                                else
                                {
                                        if(cline[i]!=null)
                                        {
                                                ps.println(cline[i]);
                                        }
                                }
                        }
                        fos.close();    
                        status=0;
                }
                catch(Exception ex)
                {
                        status=1;       
                }
                return status;  
        }

        //function to generate and print the daily transaction report
        private void displayReport()
        {
                String id,desc,qty,value,stock,s;
                String cline[]=new String[5];

                try
                {
                        frs=new FileReader("Transaction.txt");
                        br=new BufferedReader(frs);             

                        System.out.println("\nID   Description   Qty Sold   Amount   C.Stock");
                        System.out.println("----------------------------------------------");

                        while((s=br.readLine()) != null)
                        {
                                cline=s.split(",");
                                id=cline[0];
                                desc=cline[1];
                                qty=cline[2];
                                value=cline[3];
                                stock=cline[4];

                                System.out.println(id+"   "+desc+"              "+qty+"   "+"Rs."+value+"   "+stock);
                        }       
                }
                catch(Exception ex)
                {
                        System.out.println("Some exceptions occured...");
                        System.out.println("Could not generate the daily transaction report...!");      
                }
        }

        public static void main(String args[]) throws IOException
        {
                store inv=new store();
                int ch=0;
                String s;
                InputStreamReader ir=new InputStreamReader(System.in);
                BufferedReader br=new BufferedReader(ir);

                System.out.println("S T O C K    M A N A G E M E N T    S Y S T E M");
                System.out.println("-----------------------------------------------");
                System.out.println("1. ADD NEW PRODUCT");
                System.out.println("2. SELL PRODUCT");
                System.out.println("3. VIEW DAILY TRANSACTION REPORT");
                System.out.println("---------------------------------");
                System.out.println("4. Exit");
                begin:
                while(ch!=4)
                {
                        System.out.print("\n");
                        System.out.print("\n Enter a choice and Press ENTER to continue[1-4]:");
                        ch=Integer.parseInt(br.readLine());

                        if(ch>4||ch<1)
                        {
                                System.out.println("This doesn't appear to be a valid option...!");
                                continue begin; 
                        }

                        if(ch==1)
                        {
                                s="y";
                                while(s.equals("y")||s.equals("Y"))
                                {
                                        inv.addItem();
                                        System.out.print("\n Add another[y/n]:");
                                        s=br.readLine();                                                
                                }
                                continue begin;
                        }
                        else
                        if(ch==2)
                        {
                                s="y";
                                while(s.equals("y")||s.equals("Y"))
                                {
                                        inv.makeTransaction();                  
                                        System.out.print("\n Sell another[y/n]:");
                                        s=br.readLine();                                                
                                }
                        }
                        else
                        if(ch==3)
                        {
                                inv.displayReport();            
                        }       
                }
                System.out.println("Thanks for using this program...!");
        }
} 

Item.txt

00001,aa,12000.0,1,1
00002,bb,23000.0,33,7
00003,cc,12000.0,345,23
00004,dd,10000.0,40,12
00005,ee,5000.0,12,1
00006,ff,4500.0,20,5
00007,gg,3000.0,15,3
00008,hh,2500.0,100,20

Transaction.txt

00002,bb,12,276000.0,33