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9.0

Search funtion not working

Asked by spoilerbalto in New to Java Programming, Java Programming Language

Can someone please help me with my program?
I have tried to get my search funtion to work in my program, but it is not working.
Please help me with what is not correct.
I can not use a database and I can not use GUI. I can only use arrays and loops.
What is happening is, the search promps are showing up, but when  I am finished entering the information, I receive an error "Exception in thread "main" java.lang.NullPointerException with additional lines beneth it. 
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mport java.io.*;  //Java input and output
import java.util.Arrays;  // Allows for arrays in the program
 
 
 
public class teamprojectkelly   //Beginning of the class
 
{
	static  BufferedReader buf =
				 new BufferedReader(new InputStreamReader(System.in));
 
	public static void main(String [] args)  throws Exception //This is the signature of entry point of all desktop apps.
 
		{       // Search chars on output
				String [] Computer = new String[30];
       			String [] Description =  new String[30];
				int [] Price = new int[30];
				int [] Quantity = new int[30];
 
				//Data for the arrays
	            Computer[0] = "Dell OptiPlex";
	            Computer[1] = "Dell Studio Hybrid";
	            Computer[2] = "Dell Optiplex";
	            Computer[3] = "Ahkr-LoCO2PC";
	            Computer[4] = "Akhter-LoCO2PC";
	            Computer[5] = "Akhter-LoCO2PC";
	            Computer[6] = "Akhter-LoCO2PC";
	            Computer[7] = "AMI Computera AIM PC";
				Computer[8] = "PDS PC Vendor JQ";
			    Computer[9] = "Dell OptiPlex";
			    Computer[10] = "Dell OptiPlex";
			    Computer[11] = "Dell OptiPlex";
			    Computer[12] = "MPC ClientPro";
			    Computer[13] = "Dell Insprion";
			    Computer[14] = "Lenovo ThinkCentre M58/M58p Eco uSFF";
			    Computer[15] = "Lenovo ThinkCentre M58/M58p TOWER";
			    Computer[16] = "Lenovo ThinkCentre M58/M58p SFF";
			    Computer[17] = "Lenovo ThinkCentre M57";
			    Computer[18] = "Samsung 711NT";
			    Computer[19] = "Transource Mirage";
			    Computer[20] = "ZMAX Industria E Comercio LTDA Merchant 3200";
 
				Description[0] = "960Desktop";
				Description[1] = "140g";
				Description[2] = "19-AIO-DT-2.6 Vista";
				Description[3] = "19-AIO-XP";
				Description[4] = "19-AIO-DT.3.0-Vista";
				Description[5] = "19-AIO-DT-3.0-XP";
				Description[6] = "2xx";
				Description[7] = "314272";
				Description[8] = "330 Desktop";
				Description[9] = "330 Mini Tower";
				Description[10] = "360 Desktop";
				Description[11] = "385 Mini Tower";
				Description[12] = "6139";
				Description[13] = "6239";
				Description[14] = "6258";
				Description[15] = "6393";
				Description[16] = "711NT";
				Description[17] = "775";
				Description[18] = "9041100140";
				Description[19] = "XL-NT90-23";
				Description[20] = "XPS-9000-2008";
 
				Price[0] = 600;
				Price[1] = 375;
				Price[2] = 855;
				Price[3] = 698;
				Price[4] = 565;
				Price[5] = 479;
				Price[6] = 1255;
				Price[7] = 659;
				Price[8] = 999;
				Price[9] = 479;
				Price[10] = 896;
				Price[11] = 456;
				Price[12] = 685;
				Price[13] = 1123;
				Price[14] = 1525;
				Price[15] = 1246;
				Price[16] = 1685;
				Price[17] = 989;
				Price[18] = 675;
				Price[19] = 1245;
				Price[20] = 1100;
 
 
				Quantity[0] = 2;
	            Quantity[1] = 3;
	            Quantity[2] = 3;
	            Quantity[3] = 2;
	            Quantity[4] = 45;
	            Quantity[5] = 3;
	            Quantity[6] = 23;
	            Quantity[7] = 23;
				Quantity[8] = 25;
			    Quantity[9] = 12;
			    Quantity[10] = 34;
			    Quantity[11] = 1;
			    Quantity[12] = 3;
			    Quantity[13] = 5;
			    Quantity[14] = 3;
			    Quantity[15] = 3;
			    Quantity[16] = 2;
			    Quantity[17] = 2;
			    Quantity[18] = 5;
			    Quantity[19] = 3;
			    Quantity[20] = 3;
 
		//Getting Strings from the command line
 		String str = new String();
	    String name;
	    int no;
	    int counter=0;
 
					//Call Main Menu
 					do {
 
           					str = MainMenu();
        					no = Integer.parseInt(str);
 
        						switch(no) //Beginning of switch
        							{
										case 1:
					   						System.out.println("Add Inventory");
					    					counter = AddComp(Computer, Description, Price, Quantity);
					   						break;
										case 2:
										    System.out.println("Search Menu");
										    counter = SearchMode(Computer, Description, Price, Quantity);
											break;
										case 3:
											for (int i=0; i <= counter-1; i++)
												{
											        System.out.println(" Computer Name: " + Computer[i] + " Description : " + Description[i] + " Price: " + Price[i]);
												}
	            									  break;
										case 4:
											System.out.println("Sell Inventory");
											counter = SearchMode(Computer, Description, Price, Quantity);
      	    							    break;
										case 5:
												break;
 
										default:
										     System.out.println("Welcome to Web420!");
										     break;
		   							 } //end of switch
							}
        			while (no !=5);
 
 
	 } // end of main
 
 
	 private static String MainMenu()
	 {
        String response =""; // Display for options and options for input
 
        System.out.println("\t\t\t*******************\n\t\t\tComputer Inventory\n\t\t\t*******************\n\t\t\t");
	    System.out.println("\t\t\t(1) Add Computers");
	    System.out.println("\t\t\t(2) Seach Mode");
	    System.out.println("\t\t\t(3) Display Inventory");
	    System.out.println("\t\t\t(4) Sell Inventory");
	    System.out.println("\t\t\t(5) Quit");
 
	    System.out.println("\t\t\tSelect (1-5): ");
// This is the start for adding a computer
		try {
  	    response = buf.readLine();
	    } catch (Exception e) {
	 			   System.out.println("\t\t\tbad input");
	    }
  	    return response;
      }
	private static int AddComp(String[] Computer, String[] Description,int[] Price, int[] Quantity)
	{
			    String str = new String();
			    String Comp;
			    String De;
			    int Worth;
			    String Quant;
			    int counter=0;
 
 
		try{
 
			do {
				System.out.print("");
			 	System.out.print("\t\t\tEnter The Computer Name: ");
				Comp = buf.readLine();
		        Computer[counter] = Comp;
 
				System.out.print("");
		        System.out.print("\t\t\tEnter The Computer Description: ");
				De = buf.readLine();
				Description[counter] = De;
 
				System.out.print("");
		  		System.out.print("\t\t\tEnter The Price: ");
			    str = buf.readLine();
				Worth = Integer.parseInt(str);
				Price[counter] = Worth;
				System.out.print("");
 
				System.out.print("");
				System.out.print("\t\t\tEnter the Quantity: ");
				Quant = buf.readLine();
				Quantity[counter] = Integer.parseInt(Quant);
 
 
		        System.out.println();
 
 
		        System.out.println("Congratulations! You added " + Computer[counter] + ", " + Description [counter] + ", Priced at $" + Price[counter] + ", with " + Quantity[counter] + " in stock");
 
		  		System.out.print("\t\t\tTo finish Enter (E) or (C) to continue: ");
			    str = buf.readLine();
 
 
		        counter++;
 
			}
	        while ( !(str.compareToIgnoreCase("E") == 0));
 
 
		    System.out.println("\n");
 
		}
 
 
		catch (Exception e) {
			System.out.println("\t\t\tbad input");
	    }  //end catch
	    return counter;
 
    } // end of method AddComputer
 
 
// Start to add inventory
 
private static int SearchMode(String[] Computer, String[] Description,int[] Price, int[]Quantity) throws Exception
 
{								String str = new String();
 
			    				int counter=0;
								int no;
 
	           					str = SearchMenu();
	        					no = Integer.parseInt(str);
 
 
    do {
 
 
 
 
	        						switch(no)
	        							{
											case 1:
						   						System.out.println("Add Inventory - Computer");
						   						System.out.print("");
												System.out.print("\t\t\tEnter The Computer Name to Search: ");
												String Comp_Input = buf.readLine();
												System.out.println("\t\t\tYour Entered: "+ Comp_Input);
						   						Arrays.sort(Computer);
						    					int Computer_Search = Arrays.binarySearch(Computer, Comp_Input);
						   						break;
											case 2:
											    System.out.println("Search Menu - Description");
											    System.out.print("");
												System.out.print("\t\t\tEnter The Descripton to Search: ");
												String Description_Input = buf.readLine();
												System.out.println("\t\t\tYour Entered: "+ Description_Input);
											    Arrays.sort(Description);
											    int Description_search = Arrays.binarySearch(Description, Description_Input);
												break;
											case 3:
												System.out.println("Search Menu - Prices");
												System.out.print("");
												System.out.print("\t\t\tEnter The Descripton to Search: ");
												String Price_Input = buf.readLine();
												System.out.println("\t\t\tYour Entered: "+ Price_Input);
   											 	Arrays.sort(Price);
											    int Price_Search = Arrays.binarySearch(Price, Integer.parseInt(Price_Input));
											    break;
											case 4:
	        	    							    //return main(String [] args);
													break;
	        	    						case 5:
	        	    								break;
											default:
											     System.out.println("Welcome to Web420!");
											     break;
			   							 } //end of switch
								}
	        			while (no !=5);
	        			return 0;
 
}
//End to add inventory
 
 
 
private static String SearchMenu()
	 {
        String response ="";
 
        System.out.println("\t\t\t*******************\n\t\t\tSearch Menu\n\t\t\t*******************\n\t\t\t");
	    System.out.println("\t\t\t(1) Search by Computer Name");
	    System.out.println("\t\t\t(2) Search by Computer Description");
	    System.out.println("\t\t\t(3) Search by Prices");
	    System.out.println("\t\t\t(4) Return to Main Menu");
	    System.out.println("\t\t\t(5) Quit.");
 
	    System.out.println("\t\t\tSelect (1-5): ");
 
		try {
  	    response = buf.readLine();
	    } catch (Exception e) {
	 			   System.out.println("\t\t\tbad input");
	    }
  	    return response;
      }
}
[+][-]01/21/09 12:54 AM, ID: 23427910Accepted Solution

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About this solution

Zones: New to Java Programming, Java Programming Language
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Solution Provided By: humanonomics
Participating Experts: 2
Solution Grade: A
 
[+][-]01/20/09 06:47 PM, ID: 23426482Expert Comment

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[+][-]01/20/09 07:58 PM, ID: 23426760Author Comment

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[+][-]01/21/09 01:01 AM, ID: 23427934Assisted Solution

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[+][-]01/21/09 01:11 AM, ID: 23427975Assisted Solution

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[+][-]02/02/09 11:41 PM, ID: 23534838Expert Comment

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