import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
public class SelectPosition extends JFrame{
private final BorderLayout borderLayout = new BorderLayout();
private final JPanel panel = new JPanel();
private final JLabel label = new JLabel();
public static void main(String[] args) {
SelectPosition frame = new SelectPosition();
frame.setVisible(true);
}
public SelectPosition() {
super();
setTitle("控制内容的对齐方式 ");
setBounds(100, 100, 500, 375);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
panel.setLayout(borderLayout);
getContentPane().add(panel, BorderLayout.NORTH);
label.setText("请注意我的位置啊!");
JPanel southPanel = new JPanel();
getContentPane().add(southPanel, BorderLayout.CENTER);
ButtonGroup group = new ButtonGroup();
final JRadioButton leftButton = new JRadioButton();
leftButton.setText("靠左侧显示");
group.add(leftButton);
southPanel.add(leftButton);
leftButton.addActionListener(new leftActionListener());
final JRadioButton middleButton = new JRadioButton();
middleButton.setText("居中显示");
middleButton.setSelected(true);
group.add(middleButton);
southPanel.add(middleButton);
middleButton.addActionListener(new middleActionListener());
final JRadioButton rightButton = new JRadioButton();
rightButton.setText("靠右侧显示");
group.add(rightButton);
southPanel.add(rightButton);
rightButton.addActionListener(new rightActionListener() );
}
class middleActionListener implements ActionListener {
public void actionPerformed(ActionEvent e){
panel.add(label, BorderLayout.CENTER);
}
}
class rightActionListener implements ActionListener {
public void actionPerformed(ActionEvent e){
panel.add(label, BorderLayout.EAST);
}
}
class leftActionListener implements ActionListener {
public void actionPerformed(ActionEvent e){
panel.add(label, BorderLayout.WEST);
}
}}
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
public class SelectPosition extends JFrame{
private final BorderLayout borderLayout = new BorderLayout();
private final JPanel panel = new JPanel();
private final JLabel label = new JLabel();
public static void main(String[] args) {
SelectPosition frame = new SelectPosition();
frame.setVisible(true);
}
public SelectPosition() {
super();
setTitle("控制内容的对齐方式 ");
setBounds(100, 100, 500, 375);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
panel.setLayout(borderLayout);
getContentPane().add(panel, BorderLayout.NORTH);
label.setText("请注意我的位置啊!");
JPanel southPanel = new JPanel();
getContentPane().add(southPanel, BorderLayout.CENTER);
ButtonGroup group = new ButtonGroup();
final JRadioButton leftButton = new JRadioButton();
leftButton.setText("靠左侧显示");
group.add(leftButton);
southPanel.add(leftButton);
leftButton.addActionListener(new leftActionListener());
final JRadioButton middleButton = new JRadioButton();
middleButton.setText("居中显示");
middleButton.setSelected(true);
group.add(middleButton);
southPanel.add(middleButton);
middleButton.addActionListener(new middleActionListener());
final JRadioButton rightButton = new JRadioButton();
rightButton.setText("靠右侧显示");
group.add(rightButton);
southPanel.add(rightButton);
rightButton.addActionListener(new rightActionListener() );
}
class middleActionListener implements ActionListener {
public void actionPerformed(ActionEvent e){
panel.add(label, BorderLayout.CENTER);
}
}
class rightActionListener implements ActionListener {
public void actionPerformed(ActionEvent e){
panel.add(label, BorderLayout.EAST);
}
}
class leftActionListener implements ActionListener {
public void actionPerformed(ActionEvent e){
panel.add(label, BorderLayout.WEST);
}
}}
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;public class SelectPosition extends JFrame implements ActionListener {
private static final long serialVersionUID = 1L;
private JPanel jpanel;
private JLabel label= new JLabel("请注意我的位置啊!");
private JButton leftButton=new JButton("靠左侧显示");;
private JButton middleButton=new JButton("居中显示");
private JButton rightButton=new JButton("靠右侧显示");
private JPanel southPanel=new JPanel(); public static void main(String[] args) {
new SelectPosition();
} public SelectPosition() {
this.setTitle("控制内容的对齐方式 ");
this.setSize(500,400);
init();
this.getContentPane().add(jpanel,BorderLayout.CENTER);
this.getContentPane().add(southPanel,BorderLayout.NORTH);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true); }
private void init(){
leftButton.addActionListener(this);
middleButton.setSelected(true);
middleButton.addActionListener(this);
rightButton.addActionListener(this);
southPanel.add(leftButton);
southPanel.add(middleButton);
southPanel.add(rightButton);
jpanel=new JPanel();
jpanel.setLayout(new BorderLayout(0, 0));
jpanel.add(label, BorderLayout.CENTER);
}
public void actionPerformed(ActionEvent e) {
if (e.getSource() == leftButton) {
leftAction();
}
if (e.getSource() == rightButton) {
rightAction();
} if (e.getSource() == middleButton) {
centerAction();
} }
private void centerAction() {
jpanel.add(label,BorderLayout.CENTER);
jpanel.doLayout();
} private void rightAction() {
jpanel.add(label,BorderLayout.EAST);
jpanel.doLayout();
} private void leftAction() {
jpanel.add(label,BorderLayout.WEST);
jpanel.doLayout();
}
}
class rightActionListener implements ActionListener {
public void actionPerformed(ActionEvent e){
panel.add(label, BorderLayout.EAST);
panel.doLayout();}