Swing I - Absolute Java - page 1012

storyPanel.add(story, BorderLayout.CENTER);
JLabel storyLabel = new JLabel("Enter your story here:");
storyPanel.add(storyLabel, BorderLayout.NORTH);

add(storyPanel);

JPanel buttonPanel = new JPanel( );
buttonPanel.setLayout( new FlowLayout( ));
buttonPanel.setBackground(Color.PINK);
JButton actionButton = new JButton("Click me");
actionButton.addActionListener(this);
buttonPanel.add(actionButton);

JButton clearButton = new JButton("Clear");
clearButton.addActionListener(this);
buttonPanel.add(clearButton);

add(buttonPanel);
}

public void actionPerformed(ActionEvent e)
{
String actionCommand = e.getActionCommand( );

if (actionCommand.equals("Click me"))
{
int lineCount = getLineCount();
story.setText("Your story is "

+ lineCount + " lines long.");

}
else if (actionCommand.equals("Clear"))
story.setText("");
else
story.setText("Unexpected error.");
}
private int getLineCount()
{
String storyString = story.getText();
int count = 0;

for ( int i = 0; i < storyString.length(); i++)
if (storyString.charAt(i) == '\n')
count++;

return count + 1; //The last line has no '\n'.
}
}