Java 清除JFrame的组件并添加新组件
我有一个Java 清除JFrame的组件并添加新组件,java,swing,jframe,layout-manager,cardlayout,Java,Swing,Jframe,Layout Manager,Cardlayout,我有一个JFrame,它有一些选项。按下OK按钮时,我希望使用相同的JFrame清除内容并添加新内容。我已经试过了,但问题是新的JFrame弹出了。我做错了什么 import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.IOException; import java.net.InetAddress; import java.net.Unkn
JFrame
,它有一些选项。按下OK按钮时,我希望使用相同的JFrame
清除内容并添加新内容。我已经试过了,但问题是新的JFrame
弹出了。我做错了什么
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
public class GuiFrame extends JFrame {
final JFrame f = new JFrame("Test");
public void Starter(){
ImageIcon img = new ImageIcon("C:\\Users\\neal\\Desktop\\no.png");
f.setIconImage(img.getImage());
ButtonGroup group = new ButtonGroup();
final JRadioButton Acess = new JRadioButton("Acess");
final JRadioButton Chat = new JRadioButton("Chat");
group.add(Acess);
group.add(Chat);
f.setSize(400,100);
f.setLocationRelativeTo(null);
JButton OptionOk = new JButton("OK");
Label option = new Label("Choose a Option");
final Container content = f.getContentPane();
content.setBackground(Color.white);
content.setLayout(new FlowLayout());
content.add(option);
content.add(Acess);
content.add(Chat);
content.add(OptionOk);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
OptionOk.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
new GuiFrame().Initiate();
} catch (UnknownHostException ex) {
Logger.getLogger(GuiFrame.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
}
public void Initiate() throws UnknownHostException {
f.removeAll();
ButtonGroup group = new ButtonGroup();
final JRadioButton ButtonServer = new JRadioButton("Server");
final JRadioButton ButtonClient = new JRadioButton("Client");
group.add(ButtonServer);
group.add(ButtonClient);
f.setSize(400, 100);
f.setLocationRelativeTo(null);
InetAddress thisIp = InetAddress.getLocalHost();
ImageIcon img = new ImageIcon("C:\\Users\\neal\\Desktop\\no.png");
f.setIconImage(img.getImage());
Label lip = new Label("Your IP is : " + thisIp.getHostAddress());
Label setup = new Label("Setup as ");
JButton ButtonOk = new JButton("OK");
final Container content = f.getContentPane();
content.setBackground(Color.white);
content.setLayout(new FlowLayout());
content.add(lip);
content.add(setup);
content.add(ButtonServer);
content.add(ButtonClient);
content.add(ButtonOk);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) throws UnknownHostException {
GuiFrame gf = new GuiFrame();
gf.Starter();
}
}
解决方案很简单:使用CardLayout,让这个布局管理器为您完成所有繁重的工作。有关如何执行此操作的更多详细信息,请参阅教程: 至于您的代码,请注意,当它启动时,您实际上创建了2个jframe,如果按下JButton,则会创建另外两个jframe: GuiFrame类本身扩展了JFrame,但它似乎是一个从未使用过的JFrame,因此被浪费了,但它仍然是在程序启动时以及每当创建GuiFrame实例时创建的,例如当按下按钮时。然后在这个类中创建另一个JFrame f,一个在程序启动时创建,另一个在按钮按下时创建,我不认为这是您想要做的 因此,请更改代码,使类不会扩展JFrame,并且不要在按钮的ActionListener中创建该类的新实例。而是使用CardLayout交换视图 例如:
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class GuiFrame {
private static final String FIRST_PANEL = "First Panel";
private static final String SECOND_PANEL = "Second Panel";
final JFrame f = new JFrame("Test");
private CardLayout cardLayout = new CardLayout();
private JPanel content;
public void Starter() {
f.setSize(400, 100);
f.setLocationRelativeTo(null);
JButton OptionOk = new JButton("OK");
Label option = new Label("Choose a Option");
content = (JPanel) f.getContentPane();
content.setLayout(cardLayout);
JPanel firstPanel = new JPanel();
firstPanel.setBackground(Color.white);
firstPanel.setLayout(new FlowLayout());
firstPanel.add(option);
firstPanel.add(OptionOk);
content.add(firstPanel, FIRST_PANEL);
content.add(createSecondPanel(), SECOND_PANEL);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
OptionOk.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cardLayout.show(content, SECOND_PANEL);
}
});
}
private JPanel createSecondPanel() {
JPanel secondPanel = new JPanel();
secondPanel.add(new JButton(new AbstractAction("Go Back") {
public void actionPerformed(ActionEvent e) {
cardLayout.show(content, FIRST_PANEL);
}
}));
return secondPanel;
}
public static void main(String[] args) {
GuiFrame gf = new GuiFrame();
gf.Starter();
}
}
固定(但仍然脏)版本:
解释得很好,卡片布局+1。感谢有一些java代码约定:首先使用小写字符编写变量和字段,然后使用大写字符编写类名。Object obj=新对象();
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
public class GuiFrame implements ActionListener{
final JFrame f = new JFrame("Test");
public void start(){
ImageIcon img = new ImageIcon("C:\\Users\\neal\\Desktop\\no.png");
f.setIconImage(img.getImage());
ButtonGroup group = new ButtonGroup();
final JRadioButton Acess = new JRadioButton("Acess");
final JRadioButton Chat = new JRadioButton("Chat");
group.add(Acess);
group.add(Chat);
f.setSize(400,100);
f.setLocationRelativeTo(null);
JButton OptionOk = new JButton("OK");
Label option = new Label("Choose a Option");
final Container content = f.getContentPane();
content.setBackground(Color.white);
content.setLayout(new FlowLayout());
content.add(option);
content.add(Acess);
content.add(Chat);
content.add(OptionOk);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
OptionOk.addActionListener(this);
}
public void initiate() throws UnknownHostException {
//f.removeAll();
ButtonGroup group = new ButtonGroup();
final JRadioButton ButtonServer = new JRadioButton("Server");
final JRadioButton ButtonClient = new JRadioButton("Client");
group.add(ButtonServer);
group.add(ButtonClient);
f.setSize(400, 100);
f.setLocationRelativeTo(null);
InetAddress thisIp = InetAddress.getLocalHost();
ImageIcon img = new ImageIcon("C:\\Users\\neal\\Desktop\\no.png");
f.setIconImage(img.getImage());
Label lip = new Label("Your IP is : " + thisIp.getHostAddress());
Label setup = new Label("Setup as ");
JButton ButtonOk = new JButton("OK");
final Container content = f.getContentPane();
content.removeAll();
content.setBackground(Color.white);
content.setLayout(new FlowLayout());
content.add(lip);
content.add(setup);
content.add(ButtonServer);
content.add(ButtonClient);
content.add(ButtonOk);
f.repaint();
}
public void actionPerformed(ActionEvent arg0) {
try {
initiate();
} catch (UnknownHostException ex) {
Logger.getLogger(GuiFrame.class.getName()).log(Level.SEVERE, null, ex);
}
}
public static void main(String[] args) throws UnknownHostException {
GuiFrame gf = new GuiFrame();
gf.start();
}
}