inventory.java

32个java程序源代码

// Exercise 22.11: Inventory.java
// Calculates the number of items in a shipment based on the number 
// of cartons received and the number of items per carton.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

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

   // JLabel and JTextField for items per carton
   private JLabel itemsJLabel;
   private JTextField itemsJTextField;
   
   // JLabel and JTextField for total items per shipment
   private JLabel totalJLabel;
   private JTextField totalJTextField;

   // 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 );
      cartonsJTextField.addKeyListener(

         new KeyAdapter() // anonymous inner class
         {
            // event handler called when cartonsJTextField is edited
            public void keyPressed( KeyEvent event )
            {
               cartonsJTextFieldKeyPressed( event );
            }

         } // end anonymous inner class

      ); // end call to addKeyListener

      // set up itemsJLabel
      itemsJLabel = new JLabel();
      itemsJLabel.setText( "Items per carton:" );
      itemsJLabel.setBounds( 16, 48, 104, 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 );
      itemsJTextField.addKeyListener(

         new KeyAdapter() // anonymous inner class
         {
            // event handler called when itemsJTextField is edited
            public void keyPressed( KeyEvent event )
            {
               itemsJTextFieldKeyPressed( event );
            }

         } // end anonymous inner class

      ); // end call to addKeyListener

      // set up totalJLabel
      totalJLabel = new JLabel();
      totalJLabel.setText( "Total:" );
      totalJLabel.setBounds( 204, 16, 40, 21 );
      contentPane.add( totalJLabel );

      // set up totalJTextField
      totalJTextField = new JTextField();
      totalJTextField.setBounds( 244, 16, 86, 21 );
      totalJTextField.setHorizontalAlignment( JTextField.RIGHT );
      totalJTextField.setEditable( false );
      contentPane.add( totalJTextField );

      // 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 clicked
            public void actionPerformed( ActionEvent event )
            {
               calculateJButtonActionPerformed( event );
            }

         } // end anonymous inner class

      ); // end call to addActionListener

      // set properties of application's window
      setTitle( "Inventory" ); // set title bar string
      setSize( 354, 112 );     // set window size
      setVisible( true );      // display window

   } // end method createUserInterface
  
   // ensure only numbers are entered in cartonsJTextField
   private void cartonsJTextFieldKeyPressed( KeyEvent event )
   {
   
   } // end method cartonsJTextFieldKeyPressed
   
   // ensure only numbers are entered in itemsJTextField
   private void itemsJTextFieldKeyPressed( KeyEvent event )
   {
   
   } // end method itemsJTextFieldKeyPressed
   
   // method to calculate the total inventory
   private void calculateJButtonActionPerformed(ActionEvent event) 
   {
      // import data from JTextFields
      int cartons = Integer.parseInt( cartonsJTextField.getText() );
      int items = Integer.parseInt( itemsJTextField.getText() );
      
      // calculate the total
      int total = items * cartons;
      
      // convert output to string and display in totalJTextField
      totalJTextField.setText( String.valueOf( total ) );
      
   } // 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

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