[英]Opening a new JFrame from a Button
I want to open a new JFrame by clicking a button (btnAdd);我想通过单击按钮 (btnAdd) 打开一个新的 JFrame; I have tried to create an actionlistener but I am having no luck;
我试图创建一个动作监听器,但我没有运气; the code runs but nothing happens when the button is clicked.
代码运行但单击按钮时没有任何反应。 The methods in question are the last two in the following code.
有问题的方法是以下代码中的最后两个。 Any help is much appreciated!
任何帮助深表感谢!
package AdvancedWeatherApp;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingConstants;
import javax.swing.event.ListSelectionListener;
import weatherforecast.FetchWeatherForecast;
public class MainFrame extends JFrame implements ListSelectionListener {
private boolean initialized = false;
private Actions actions = new Actions();
private javax.swing.JScrollPane jspFavouritesList = new javax.swing.JScrollPane();
private javax.swing.DefaultListModel<String> listModel = new javax.swing.DefaultListModel<String>();
private javax.swing.JList<String> favouritesList = new javax.swing.JList<String>(
listModel);
private javax.swing.JLabel lblAcknowledgement = new javax.swing.JLabel();
private javax.swing.JLabel lblTitle = new javax.swing.JLabel();
private javax.swing.JButton btnAdd = new javax.swing.JButton();
private javax.swing.JButton btnRemove = new javax.swing.JButton();
public void initialize() {
initializeGui();
initializeEvents();
this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
}
/**
*
*/
private void initializeGui() {
if (initialized)
return;
initialized = true;
this.setSize(500, 400);
Dimension windowSize = this.getSize();
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
this.setLocation(screenSize.width / 2 - windowSize.width / 2,
screenSize.height / 2 - windowSize.height / 2);
Container pane = this.getContentPane();
pane.setLayout(new BorderLayout());
setLayout(new BorderLayout());
setTitle("Favourite Weather Locations");
JPanel jpSouth = new JPanel();
jpSouth.setLayout(new FlowLayout());
JPanel jpNorth = new JPanel();
jpNorth.setLayout(new FlowLayout());
JPanel jpCenter = new JPanel();
jpCenter.setLayout(new BoxLayout(jpCenter, BoxLayout.PAGE_AXIS));
JPanel jpEast = new JPanel();
JPanel jpWest = new JPanel();
getContentPane().setBackground(Color.WHITE);
jpEast.setBackground(Color.WHITE);
jpWest.setBackground(Color.WHITE);
jpCenter.setBackground(Color.WHITE);
getContentPane().add(jspFavouritesList);
jpCenter.add(jspFavouritesList);
jspFavouritesList.setViewportView(favouritesList);
favouritesList
.setSelectionMode(javax.swing.ListSelectionModel.SINGLE_SELECTION);
favouritesList.addListSelectionListener(this);
jpCenter.add(btnAdd);
jpCenter.add(btnRemove);
jpCenter.setAlignmentY(CENTER_ALIGNMENT);
btnAdd.setText("Add Location");
btnAdd.setAlignmentX(Component.CENTER_ALIGNMENT);
btnAdd.setFont(new Font("Calibri", Font.PLAIN, 18));
jpCenter.add(btnRemove);
btnRemove.setText("Remove Location");
btnRemove.setAlignmentX(Component.CENTER_ALIGNMENT);
btnRemove.setFont(new Font("Calibri", Font.PLAIN, 18));
getContentPane().add(jpEast, BorderLayout.EAST);
getContentPane().add(jpWest, BorderLayout.WEST);
getContentPane().add(jpSouth);
jpSouth.add(lblAcknowledgement);
add(lblAcknowledgement, BorderLayout.SOUTH);
lblAcknowledgement.setText(FetchWeatherForecast.getAcknowledgement());
lblAcknowledgement.setHorizontalAlignment(SwingConstants.CENTER);
lblAcknowledgement.setFont(new Font("Tahoma", Font.ITALIC, 12));
getContentPane().add(jpNorth);
jpNorth.add(lblTitle);
add(lblTitle, BorderLayout.NORTH);
lblTitle.setText("Your Favourite Locations");
lblTitle.setHorizontalAlignment(SwingConstants.CENTER);
lblTitle.setFont(new Font("Calibri", Font.PLAIN, 32));
lblTitle.setForeground(Color.DARK_GRAY);
getContentPane().add(jpCenter);
}
private void initializeEvents() {
// TODO: Add action listeners, etc
}
public class Actions implements ActionListener {
public void actionPerformed(ActionEvent e) {
String command = e.getActionCommand();
command = command == null ? "" : command;
// TODO: add if...if else... for action commands
}
}
public void dispose() {
// TODO: Save settings
// super.dispose();
System.exit(0);
}
public void setVisible(boolean b) {
initialize();
super.setVisible(b);
}
public static void main(String[] args) {
new MainFrame().setVisible(true);
}
public void actionPerformed(ActionEvent evt){
if (evt.getSource() == btnAdd) {
showNewFrame();
//OPEN THE SEARCH WINDOW
}
}
private void showNewFrame() {
JFrame frame = new JFrame("Search Window" );
frame.setSize( 500,120 );
frame.setLocationRelativeTo( null );
frame.setVisible( true );
}
}
Although you have implemented the actionPerformed
method as per the ActionListener interface, you class is not of that that type as you haven't implemented the interface.尽管您已经按照ActionListener接口实现了
actionPerformed
方法,但是您的类不是那种类型,因为您还没有实现该接口。 Once you implement that interface and register it with the JButton
btnAdd
,一旦您实现了该接口并将其注册到
JButton
btnAdd
,
btnAdd.addActionListener(this);
the method will be called.该方法将被调用。
A more compact alternative might be to use an anonymous interface:更紧凑的替代方法可能是使用匿名接口:
btnAdd.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// handle button ActionEvent & display dialog...
}
});
Side notes:旁注:
JFrame
in an application creates a lot of overhead for managing updates that may need to exist between frames.JFrame
会为管理可能需要存在于帧之间的更新带来大量开销。 The preferred approach is to use a modal JDialog
if another window is required.JDialog
。 This is discussed more here .Use this :用这个 :
btnAdd.addActionListener(this);
@Override
public void actionPerformed(ActionEvent e)
{
MainFrame frame = new MainFrame();
frame.setVisible(true);
}
Type this inside the button在按钮内输入这个
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
this.dispose();
ActionListener ActList = new ActionListener();
ActList.setVisible(true);
} }
看我的最后一行
{ ActList.setVisible(true); }
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