inventory.java

来自「32个java程序源代码」· Java 代码 · 共 152 行

// Exercise 4.11: Inventory.java
// This application allows the number of cartons, the number of
// items in a carton, and the number of shipments this week to be
// input and displays the total number of items.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Inventory extends JFrame
{
   // JLabel and JTextField for number of cartons
   private JLabel cartonsJLabel;
   private JTextField cartonsJTextField;

   // JLabel and JTextField for number items per carton
   private JLabel itemsJLabel;
   private JTextField itemsJTextField;
   
   // JLabel and JTextField for number shipments
   private JLabel shipmentsJLabel;
   private JTextField shipmentsJTextField;
   
   // JLabel and JTextField for total items
   private JLabel totalJLabel;
   private JTextField totalResultJTextField;
   
   // JButton to initiate calculation of total items per shipment
   private JButton calculateJButton;
   
   // no-argument constructor
   public Inventory() 
   {
      createUserInterface();
   }
   
   // create and position GUI components; register event handlers
   private void createUserInterface()
   {
      // get content pane and set layout to null
      Container contentPane = getContentPane();
      contentPane.setLayout( null );

      // set up cartonsJLabel
      cartonsJLabel = new JLabel();
      cartonsJLabel.setText( "Cartons per shipment:" );
      cartonsJLabel.setBounds( 16, 16, 130, 21 );
      contentPane.add( cartonsJLabel );
      
      // set up cartonsJTextField
      cartonsJTextField = new JTextField();
      cartonsJTextField.setText( "0" );
      cartonsJTextField.setBounds( 148, 16, 40, 21 );
      cartonsJTextField.setHorizontalAlignment( JTextField.RIGHT );
      contentPane.add( cartonsJTextField );
      
      // set up itemsJLabel
      itemsJLabel = new JLabel();
      itemsJLabel.setText( "Items per carton:" );
      itemsJLabel.setBounds( 16, 48, 130, 21 );
      contentPane.add( itemsJLabel );
      
      // set up itemsJTextField
      itemsJTextField = new JTextField();
      itemsJTextField.setText( "0" );
      itemsJTextField.setBounds( 148, 48, 40, 21 );
      itemsJTextField.setHorizontalAlignment( JTextField.RIGHT );
      contentPane.add( itemsJTextField );
      
      // set up shipmentsJLabel
      shipmentsJLabel = new JLabel();
      contentPane.add( shipmentsJLabel );
      
      // set up shipmentsJTextField
      shipmentsJTextField = new JTextField();
      contentPane.add( shipmentsJTextField );
      
      // set up totalJLabel
      totalJLabel = new JLabel();
      totalJLabel.setText( "Total:" );
      totalJLabel.setBounds( 204, 16, 40, 21 );
      contentPane.add( totalJLabel );
      
      // set up totalResultJTextField
      totalResultJTextField = new JTextField();
      totalResultJTextField.setBounds( 244, 16, 86, 21 );
      totalResultJTextField.setEditable( false );
      totalResultJTextField.setHorizontalAlignment( 
         JTextField.RIGHT );
      contentPane.add( totalResultJTextField );
      
      // set up calculateJButton
      calculateJButton = new JButton();
      calculateJButton.setText( "Calculate Total" );
      calculateJButton.setBounds( 204, 48, 126, 24 );
      contentPane.add( calculateJButton );
      calculateJButton.addActionListener(

         new ActionListener() // anonymous inner class
         {
            // event handler called when calculateJButton is pressed
            public void actionPerformed( ActionEvent event )
            {
               calculateJButtonActionPerformed( event );
            }

         } // end anonymous inner class

      ); // end call to addActionListener
      
      // set properties of application抯 window
      setTitle( "Inventory" ); // set title bar text
      setSize( 350, 144 );     // set window size
      setVisible( true );      // display window

   } // end method createUserInterface

   // calculate total number of items and display results
   private void calculateJButtonActionPerformed( ActionEvent event )
   {
      // display result in totalResultJTextField
      totalResultJTextField.setText( String.valueOf(
         Integer.parseInt( cartonsJTextField.getText() ) * 
         Integer.parseInt( itemsJTextField.getText() ) ) );

   } // end method calculateJButtonActionPerformed

   // main method
   public static void main( String[] args ) 
   {
      Inventory application = new Inventory();
      application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
      
   } // end method main

} // end class Inventory


 /**************************************************************************
  * (C) Copyright 1992-2004 by Deitel & Associates, Inc. and               *
  * Pearson Education, Inc. All Rights Reserved.                           *
  *                                                                        *
  * DISCLAIMER: The authors and publisher of this book have used their     *
  * best efforts in preparing the book. These efforts include the          *
  * development, research, and testing of the theories and programs        *
  * to determine their effectiveness. The authors and publisher make       *
  * no warranty of any kind, expressed or implied, with regard to these    *
  * programs or to the documentation contained in these books. The authors *
  * and publisher shall not be liable in any event for incidental or       *
  * consequential damages in connection with, or arising out of, the       *
  * furnishing, performance, or use of these programs.                     *
  **************************************************************************/