Programming and Problem Solving with Java

CASE STUDY

408

Let’s call the application class Rainfall. Here is code for the complete application:

//***************************************************************************

// This application keeps track of rainfall amounts for three stations

//***************************************************************************

importjava.awt.*; // Layout manager

importjava.awt.event.*; // Event-handling classes

importjavax.swing.*; // User interface classes

importstation.*; // Rainfall station

public classRainfall

{

public static voidmain(String[] args)

{

JFrame inputFrame; // User interface frame

Container inputPane; // Content pane

// Set up the frame

inputFrame = newJFrame();

inputPane = inputFrame.getContentPane();

inputFrame.setSize( 500 , 150 );

inputFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // End event loops

inputPane.setLayout(newGridLayout( 0 , 1 ));

// Add components to pane at start of event loops

// In each case, create a station object and

// directly get its panel to add to the frame

inputPane.add((newStation("Austin")).getPanel()); // Station for Austin

inputPane.add((newStation("Amherst")).getPanel()); // Station for Amherst

inputPane.add((newStation("LaCrosse")).getPanel()); // Station for LaCrosse

inputFrame.setVisible(true); // Show the frame

}

}

When the application executes, the frame shown below is displayed. The contents

shown in the frame are the result of entering several values, with the frame appearing

as it does just before the user clicks Enter to cause a value to be processed for the

Amherst station.