inventory.java

32个java程序源代码

// Tutorial 4: 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 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
   public 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 itemsJLabel
      itemsJLabel = new JLabel();
      itemsJLabel.setText( "Items per carton:" );
      itemsJLabel.setBounds( 16, 48, 104, 21 );
      contentPane.add( itemsJLabel );

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

      // set up cartonsJTextField
      cartonsJTextField = new JTextField();
      cartonsJTextField.setText( "0" );
      cartonsJTextField.setBounds( 148, 16, 40, 21 );
      cartonsJTextField.setHorizontalAlignment( JTextField.RIGHT );
      contentPane.add( cartonsJTextField );

      // set up itemsJTextField
      itemsJTextField = new JTextField();
      itemsJTextField.setText( "0" );
      itemsJTextField.setBounds( 148, 48, 40, 21 );
      itemsJTextField.setHorizontalAlignment( JTextField.RIGHT );
      contentPane.add( itemsJTextField );

      // set up totalResultJTextField
      totalResultJTextField = new JTextField();
      totalResultJTextField.setBounds( 244, 16, 86, 21 );
      totalResultJTextField.setHorizontalAlignment( 
         JTextField.RIGHT );
      totalResultJTextField.setEditable( false );
      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( 354, 112 );     // set window size
      setVisible( true );      // display window

   } // end method createUserInterface

   // calculate the total items in the shipment
   private void calculateJButtonActionPerformed( ActionEvent event )
   {
      // multiply values input and display result in the text field
      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


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