代码如下：
public class JLabelTest extends BaseFrame {
private JLabel label;
public JLabelTest() {
JLabel label = createTestLabel();
mainWin.add(label);
JPanel p = createTestPanel();
mainWin.add(p, BorderLayout.SOUTH);
}
private JLabel createTestLabel() {
label = new JLabel();
label.setPreferredSize(new Dimension(600, 300));
label.setOpaque(true);
label.setBackground(Color.WHITE);
return label;
}
private JPanel createTestPanel() {
JPanel p = new JPanel();
p.setBorder(BorderFactory.createTitledBorder("测试"));
// 文本/图片: 显示、调整间距、助记符、禁用与启用时显示的图标
Box verticalBox = new Box(BoxLayout.Y_AXIS);
JPanel p1 = new JPanel(new FlowLayout(FlowLayout.LEFT));
final JCheckBox showIcon = createShowIconCheckBox();
final JCheckBox showText = createShowTextCheckBox();
final JTextField gapTextField = createIconTextGapTextField();
JLabel gapLabel = new JLabel("iconTextGap:");
gapLabel.setDisplayedMnemonic('G');
gapLabel.setLabelFor(gapTextField);
final JCheckBox disabledIcon = createDisabledIconCheckBox();
p1.add(showIcon);
p1.add(showText);
p1.add(gapLabel);
p1.add(gapTextField);
p1.add(disabledIcon);
verticalBox.add(p1);
// 文本 水平/垂直 位置
JPanel p2 = new JPanel(new FlowLayout(FlowLayout.LEFT));
final JComboBox horizontalTextPosition = createHorizontalTextPositionComboBox();
final JComboBox verticalTextPosition = createVerticalTextPositionComboBox();
p2.add(new JLabel("HorizontalTextPosition"));
p2.add(horizontalTextPosition);
p2.add(new JLabel("VerticalTextPosition"));
p2.add(verticalTextPosition);
verticalBox.add(p2);
// 组件 水平/垂直 对齐
JPanel p3 = new JPanel(new FlowLayout(FlowLayout.LEFT));
final JComboBox horizontalAlignment = createHorizontalAlignmentComboBox();
p3.add(new JLabel("HorizontalAlignment"));
p3.add(horizontalAlignment);
final JComboBox verticalAlignment = createVerticalAlignmentComboBox();
p3.add(new JLabel("VerticalAlignment"));
p3.add(verticalAlignment);
verticalBox.add(p3);
p.add(verticalBox);
return p;
}
private JCheckBox createDisabledIconCheckBox() {
label.setDisabledIcon(ImageManger.loadIcon("disabled.png"));
final JCheckBox checkBox = new JCheckBox("Disabled");
checkBox.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JCheckBox checkBox = (JCheckBox) e.getSource();
label.setEnabled(!checkBox.isSelected());
}
});
return checkBox;
}
private JTextField createIconTextGapTextField() {
// 如果同时设置了图标和文本属性，则此属性定义它们之间的间隔。
final JTextField gapTextField = new JTextField("4", 10);
gapTextField.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
int iconTextGap = 4;
try {
iconTextGap = Integer.valueOf(gapTextField.getText());
} catch (Exception ex) {
ex.printStackTrace();
}
label.setIconTextGap(iconTextGap);
}
});
return gapTextField;
}
private JComboBox createVerticalAlignmentComboBox() {
final JComboBox verticalAlignment = new JComboBox(new Object[]{
"SwingConstants.TOP", "SwingConstants.CENTER", "SwingContants.BOTTOM"
});
verticalAlignment.setSelectedItem("SwingConstants.CENTER");
verticalAlignment.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String item = (String) verticalAlignment.getSelectedItem();
String neededValue = item.substring(item.indexOf(".") + 1);
if(neededValue.equals("TOP")){
label.setVerticalAlignment(SwingUtilities.TOP);
}else if(neededValue.equals("CENTER")){
label.setVerticalAlignment(SwingUtilities.CENTER);
}else if(neededValue.equals("BOTTOM")){
label.setVerticalAlignment(SwingUtilities.BOTTOM);
}
}
});
return verticalAlignment;
}
private JComboBox createHorizontalAlignmentComboBox() {
final JComboBox horizontalAlignment = new JComboBox(new Object[]{
"SwingConstants.LEFT", "SwingConstants.CENTER", "SwingContants.RIGHT"
, "SwingConstants.LEADING", "SwingConstants.TRAILING"
});
horizontalAlignment.setSelectedItem("SwingConstants.LEFT");
horizontalAlignment.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String item = (String) horizontalAlignment.getSelectedItem();
String neededValue = item.substring(item.indexOf(".") + 1);
int alignment = SwingConstants.LEFT;
if(neededValue.equals("LEFT")){
alignment = SwingConstants.LEFT;
}else if(neededValue.equals("CENTER")){
alignment = SwingConstants.CENTER;
}else if(neededValue.equals("RIGHT")){
alignment = SwingConstants.RIGHT;
}else if(neededValue.equals("LEADING")){
alignment = SwingConstants.LEADING;
}else if(neededValue.equals("TRAILING")){
alignment = SwingConstants.TRAILING;
}
label.setHorizontalAlignment(alignment);
}
});
return horizontalAlignment;
}
private JComboBox createHorizontalTextPositionComboBox() {
final JComboBox horizontalTextPosition = new JComboBox(new Object[]{
"SwingConstants.LEFT", "SwingConstants.CENTER", "SwingContants.RIGHT"
, "SwingConstants.LEADING", "SwingConstants.TRAILING"
});
horizontalTextPosition.setSelectedItem("SwingConstants.LEFT");
horizontalTextPosition.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String item = (String) horizontalTextPosition.getSelectedItem();
String neededValue = item.substring(item.indexOf(".") + 1);
int textPosition = SwingConstants.LEFT;
if(neededValue.equals("LEFT")){
textPosition = SwingConstants.LEFT;
}else if(neededValue.equals("CENTER")){
textPosition = SwingConstants.CENTER;
}else if(neededValue.equals("RIGHT")){
textPosition = SwingConstants.RIGHT;
}else if(neededValue.equals("LEADING")){
textPosition = SwingConstants.LEADING;
}else if(neededValue.equals("TRAILING")){
textPosition = SwingConstants.TRAILING;
}
label.setHorizontalTextPosition(textPosition);
}
});
return horizontalTextPosition;
}
private JComboBox createVerticalTextPositionComboBox() {
final JComboBox verticalTextPosition = new JComboBox(new Object[]{
"SwingConstants.TOP", "SwingConstants.CENTER", "SwingContants.BOTTOM"
});
verticalTextPosition.setSelectedItem("SwingConstants.CENTER");
verticalTextPosition.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String item = (String) verticalTextPosition.getSelectedItem();
String neededValue = item.substring(item.indexOf(".") + 1);
if(neededValue.equals("TOP")){
label.setVerticalTextPosition(SwingUtilities.TOP);
}else if(neededValue.equals("CENTER")){
label.setVerticalTextPosition(SwingUtilities.CENTER);
}else if(neededValue.equals("BOTTOM")){
label.setVerticalTextPosition(SwingUtilities.BOTTOM);
}
}
});
return verticalTextPosition;
}
private JCheckBox createShowTextCheckBox() {
final JCheckBox showText = new JCheckBox("text");
showText.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String text = null;
if(showText.isSelected()){
text = "text";
}
label.setText(text);
}
});
showText.doClick();
return showText;
}
private JCheckBox createShowIconCheckBox() {
final JCheckBox showIcon = new JCheckBox("icon");
showIcon.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Icon icon = null;
if(showIcon.isSelected()){
icon = ImageManger.loadIcon("clock.png");
}
label.setIcon(icon);
}
});
showIcon.doClick();
return showIcon;
}
public static void main(String[] args) {
new JLabelTest().display();
}
}