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POHow to return a value from one class to another ? Java
 

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  1. POHow to return a value from one class to another ? Java
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    <p>i'm having a bit of a problem. Here's the situation. I have an amount field in my main class that gets incremented when certain buttons are clicked on. There is a method provided through which you can delete any order (I'm basically programming for a restaurant terminal) and the amount gets decremented. The delete method is placed in another class.</p> <pre><code>public void posdel(int pos, JTextField amountFieldGot, int amountGot) { if(slist==null) { JOptionPane.showMessageDialog(null, "No order has been placed yet.",null,JOptionPane.WARNING_MESSAGE); } else { if(pos==1) { reductionAmount = (slist.quantity*slist.price); amountGot = amountGot - reductionAmount; slist=slist.next; } else { int i=1; Node temp=slist; Node prev=null; while(temp.next!=null &amp;&amp; i&lt;pos) { prev=temp; temp=temp.next; i++; } if(pos==i) { prev.next=temp.next; } else { JOptionPane.showMessageDialog(null, "Invalid order", null, JOptionPane.ERROR_MESSAGE); } } } amountFieldGot.setText(Integer.toString(amountGot)); } </code></pre> <p>So basically, I have an amountField in my GUI that i pass as a parameter to the posdel method. I also pass the amount value as a parameter. The new amount that i get is amountGot after the deletion of the first order. ( I haven't written the code for other positions.) Suppose the amount value i pass into the method is 30 (14+16) 14 = order 1, 16 = order2. And my first order has a value of 14. So amountGot = 30 - 14 which is 16. And the amountField in the GUI gets updated to 16. Now my order 2 becomes my order 1. And if i try to delete this, my amountField gets update to 14. (30-16 = 14). So i'm guessing the amount value stays the same itself as 30 and does not get updated to the new amountGot value. Can someone please help me solve this problem ?</p> <p>below is the code for my delete button.</p> <pre><code>deleteButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { dishDelPos = JOptionPane.showInputDialog("Enter the position of the order to be deleted"); try { dishDeletePosition = Integer.parseInt(dishDelPos); order1.posdel(dishDeletePosition, amountField, amount); repaint(); } catch(NumberFormatException ex1) { JOptionPane.showMessageDialog(null,"This is not a valid position"); } } }); </code></pre>
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