got file working correctly, now i need to correct the item prices.

src/main/java/temp.java

@@ -27,6 +27,8 @@ public class temp extends javax.swing.JFrame {
 	//the names of the items
     static double basket[]={0, 0, 0, 0, 0};
     
+    static boolean valid = false;
+    
     //setting the default values
     static String ID = "";
     static String Chosen = "";
@@ -270,34 +272,32 @@ public class temp extends javax.swing.JFrame {
         switch(Chosen){
             //give the value of the item back
             case "Chocolate":
-                Price = "£2";
                 ID = "01";
                 break;
             case "Water":
-                Price = "£0.5";
                 ID = "02";
                 break;
             case "Drink":
-                Price = "£2";
                 ID = "03";
                 break;
             case "Snack":
-                Price = "£2";
                 ID = "04";
                 break;
             case "Sweet":
-                Price = "£1";
                 ID = "05";
                 break;
             default :
-                Price = "";
                 ID = "";
         }
         if (ID == ""){        
             PriceLabel.setText("Please selct an Item");
         } else {
-            PriceLabel.setText("Price: " + Price);
-                       
+            findItem();
+            //find the items index
+            PriceLabel.setText("Price: " + price[index]);   
+            //returns it's price.
+            cost = price[index]*quant;
+            Total.setText("Total: "+ cost);
         }
         
         //update price label
@@ -305,6 +305,7 @@ public class temp extends javax.swing.JFrame {
 
     private void quantBoxActionPerformed(java.awt.event.ActionEvent evt) {                                         
         // TODO add your handling code here:
+        findItem();
         quant = Double.parseDouble(quantBox.getSelectedItem().toString());
         //find the slected item and convet it into a double
         quantLabelchange.setText("Selected quantity: "+quant);
@@ -316,22 +317,28 @@ public class temp extends javax.swing.JFrame {
     private void PurchaseActionPerformed(java.awt.event.ActionEvent evt) {                                         
         // TODO add your handling code here:    
         amount = Double.parseDouble(moneyInput.getText());
-        payed = payed + amount;
-        jLabel3.setText("Amount Given: "+amount);
+        findItem();
         
         if(PriceLabel.getText()=="Please selct an Item"){
             error.setText("Error: No item selected"); 
+            //makes sure that the usr has an item selected before a purchase
         } else {
             error.setText("");
         }
         
         if (cost > amount){
            error.setText("Error: Payment not valid");  
+           valid = false;
         } else if(amount >= cost) {
             error.setText("Payment valid");
-            change += amount - cost;
+            if(purchase()==true){
+                //checks to see if there are enough still items left
+                //if yes, it charges the account
+                //calculates the user's change
                 moneyInput.setText(String.valueOf(amount - cost));
                 purchase();
+                valid = true;
+            }
         }
                
     }                                        
@@ -339,15 +346,27 @@ public class temp extends javax.swing.JFrame {
     private void moneyInputActionPerformed(java.awt.event.ActionEvent evt) {                                           
         // TODO add your handling code here:
         //convert contents to a double;      
+        payed = Double.parseDouble(moneyInput.getText());
         amount = Double.parseDouble(moneyInput.getText());
-        //fins the item's index
-        findItem();
+        jLabel3.setText("Amount Given: "+amount);
+        
+        
         
     }                                          
 
     private void ReceiptActionPerformed(java.awt.event.ActionEvent evt) {                                        
         // TODO add your handling code here:
+        if (valid = true){
+            //if the payemnt is valid
+
+            //update the change amount
             print();
+            //print the receipt
+        } else {
+            error.setText("Error: Payments not valid");
+            //send an error message
+        }
+        
     }                                       
 
     /**
@@ -399,18 +418,21 @@ public class temp extends javax.swing.JFrame {
 	}
     }
     
-    public void purchase(){
+    public boolean purchase(){
         while (true) {
+            findItem();
             if((quantity[index]-quant)>=0) { //if not add the item to the basket
 		quantity[index]=(quantity[index]-quant);
 		//removes the number from the quantity
 		basket[index]=(basket[index]+quant);
 		//adds the number from the quantity to ther basket
-		break;
+		return true;
             } else {				
                 //if the menu item has no quantity or less than they want, don't let them buy it.
 		error.setText("There are not enough items for that.");
-                break;
+                amount = amount + cost;
+                jLabel3.setText("Amount Given: "+amount);
+               return false;
 			}
 		}
     }
@@ -420,45 +442,38 @@ public class temp extends javax.swing.JFrame {
             FileWriter f = new FileWriter("receipt.txt");
             
             f.write("Items purchased: \n");
-            f.write("Code\tItem\t\tPrice\tQuantity \n");
-            String line = ""; 
+            f.write("Code\tItem\t\tPrice\tQuantity \t" + "\n");
 
-            //displays the menu the the user
-            for(int i=0; i < price.length; i++) {
-                if(basket[i]!=0) {
 
-                    line = (itemCode[i]+"\t");
-                    f.write(line);
-                //displays the item code
-                if (i==0||i==1||i==3) {
-                    //this adds a second tab for shorter items which would otherwise display incorrectly
-                    line = (itemName[i]+"\t");
-                    f.write(line);
+            //writes the data to a file.
+            for(int i=0; i < basket.length; i++) {
+                if(basket[i]!=0) {
+                    f.write(itemCode[i]+"\t");
+                    if(i==1||i==2||i==3||i==4){
+                        f.write(itemName[i]+"\t\t");
+                        //for dealing with shorter names
                     } else {
-                    //if the item name is not short, it only gets one tab
-                    line = (itemName[i]+"\t");
-                    f.write(line);
+                        f.write(itemName[i]+"\t");
+                        //fopr longer names
                     }
-		line = (""+price[i]+"\t");
-                f.write(line);
+                    f.write(""+price[i]+"\t");
                     //displays the price
-		if(basket[i]!=0) {
-                    line = (basket[i]+"\t");  
-                    f.write(line);
-		} else {
-                    f.write("Not in Stock");
+                    f.write(basket[i]+"\t");
+		//adds a new line to display the next item.
+		f.write("\n");
+            }
         }
+            f.write("\n" + "Total cost: " + cost + "\n");
+            f.write("\n" + "Total payed: " + payed + "\n");
+            f.write("\n" + "Change Given: " + Double.parseDouble(moneyInput.getText()) + "\n");
             
-		//adds a new line to display the next item.
-		line = ("\n");
-                f.write(line);
+            if (change >= 0){
+                f.write("\n" + "valid payment: " + true);
+            } else {
+                f.write("\n" + "valid payment: " + false);
             }
-                f.write("Total cost: " + cost + "\n");
-                f.write("Total payed: " + amount + "\n");
-                f.write("Change Given: " + change + "\n");
                 
             f.close();
-        }
         } catch(Exception e) {  
              e.printStackTrace();
              //catches execptions, the program wouldn't let me run it until i wrote this.