次のコードでは、本来あるべき出力が得られません。それが与えるべき出力は以下に示されています：
その出力の代わりに、次のような出力が得られました。
私が得ていないことに気づいたことは次のとおりです。
- ScrollBarsが垂直方向と水平方向の両方に表示されません。
- パネル「p」にある各行の行ヘッダーが取得されません。
- フォーマットも乱れているようです。プログラムが起動すると、マウスをボタンの上に移動するまでラジオボタンは表示されません。
このコードは、EclipseIDEを使用したO'REILLYのJavaSwingブック（第11章）からのものです。
package khan.ajmal.oreilly.swing;
import java.awt.Window;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class BasicWindowMonitor extends WindowAdapter {
@Override
public void windowClosing(WindowEvent e) {
Window w = e.getWindow();
w.setVisible(false);
w.dispose();
System.exit(0);
}
}
/アプリケーションウィンドウよりも大きいコンポーネントを持つJScrollPane。/パッケージkhan.ajmal.oreilly.swing.Chapter11_SpecialtyPanesAndLayoutManagers;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ButtonGroup;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.JViewport;
import javax.swing.ScrollPaneConstants;
import khan.ajmal.oreilly.swing.BasicWindowMonitor;
public class ScrollDemo2 extends JFrame {
JScrollPane scrollPane = new JScrollPane();
// Constructor
public ScrollDemo2() {
super("JScrollPane Demonstration");
/* Add in some JViewports for the column and row headers */
JViewport jv1 = new JViewport();
jv1.setView(new JLabel(
new ImageIcon(
"C:/Users/Ajmal/workspace/OreillySwing/src/khan/ajmal/oreilly/swing/Chapter11_SpecialtyPanesAndLayoutManagers/columnLabel.jpg")));
scrollPane.setColumnHeader(jv1);
JViewport jv2 = new JViewport();
jv2.setView(new JLabel(
new ImageIcon(
"C:/Users/Ajmal/workspace/OreillySwing/src/khan/ajmal/oreilly/swing/Chapter11_SpecialtyPanesAndLayoutManagers/rowLabel.jpg")));
scrollPane.setRowHeader(jv2);
/* And throw in an information button */
JButton jb1 = new JButton(
new ImageIcon(
"C:/Users/Ajmal/workspace/OreillySwing/src/khan/ajmal/oreilly/swing/Chapter11_SpecialtyPanesAndLayoutManagers/question.jpg"));
jb1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String message = "This is an active corner!";
String title = "Information";
int type = JOptionPane.INFORMATION_MESSAGE;
JOptionPane.showMessageDialog(null, message, title, type);
}// method actionPerformed ends here.
}// Definition of inner class ActionListener ends here.
);/* Passing arguments to method addActionListener ends here. */
scrollPane.setCorner(ScrollPaneConstants.UPPER_LEFT_CORNER, jb1);
setSize(300, 200);
addWindowListener(new BasicWindowMonitor());
init();
setVisible(true);
}// Constructor ends here.
private void init() {
JRadioButton form[][] = new JRadioButton[12][5];
String counts[] = { " ", "0-1", "2-5", "6-10", "11-100", "101+" };
String categories[] = { "Household", "Office", "Extended Family",
"Company (US)", "Company (World)", "Team", "Will",
"Birthday Card List", "High School", "Country", "Continent",
"Planet" };
JPanel p = new JPanel();
p.setSize(600, 400);
p.setLayout(new GridLayout(13, 6, 10, 0));
for (int row = 0; row < 13; row++) {
// creating a button group in each iteration of the row loop
ButtonGroup bg = new ButtonGroup();
for (int col = 0; col < 6; col++) {
// We need to create column headers in the first row
if (row == 0)
p.add(new JLabel(counts[col]));
else {
/*
* When the control moves to a new row, check for the
* column. In the first column put row headers
*/
if (col == 0) {
p.add(new JLabel(categories[row - 1]));/*
* row will have
* at least
* value of 1
* when control
* is at this
* line.
*/
} else {
form[row - 1][col - 1] = new JRadioButton();
bg.add(form[row - 1][col - 1]);/*
* add this button to
* the button group
*/
p.add(form[row - 1][col - 1]);
}
}
}// col for loop ends here.
}// row for loop ends here.
// Adding the panel to a scrollpane
// scrollPane = new JScrollPane(p);
scrollPane.add(p);
// adding the scrollpane to the contentpane of the frame
getContentPane().add(scrollPane, BorderLayout.CENTER);
}// method init ends here.
public static void main(String[] args) {
new ScrollDemo2();
}// method main ends here.
}// class ScrollDemo2 ends here.