java 单击按钮时在java中隐藏框架
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Hiding a frame in java upon a button click
提问by Ivan
I am trying to hide a frame once a button is clicked. The "Register" button should open up a frame where a user can register, and that works, but I am trying to hide the previous frame and I can't figure out how to do it.
单击按钮后，我试图隐藏框架。“注册”按钮应该打开一个用户可以注册的框架，并且可以，但是我试图隐藏前一个框架，但我不知道该怎么做。
Here's my code:
这是我的代码：
MainPage.java
主页.java
package Practice_1;
import java.awt.*;
import java.awt.Insets;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
/**
*
* @author Ivan
*/
public class MainPage extends JPanel
{
JButton regButton, logButton, listButton;
JLabel homeMessage;
GridBagConstraints gbc = new GridBagConstraints();
public MainPage()
{
setLayout(new GridBagLayout());
gbc.insets = new Insets(5,5,5,5);
homeMessage = new JLabel("Please select an option below:");
gbc.gridx = 0;
gbc.gridy = 0;
add(homeMessage, gbc);
regButton = new JButton("Register");
gbc.gridx = 0;
gbc.gridy = 1;
gbc.fill = GridBagConstraints.HORIZONTAL;
regButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
//Execute when button is pressed
//System.out.println("clicked");
RegisterPage regFrame = new RegisterPage();
JFrame register = new JFrame();
register.setTitle("Registration");
register.setSize(300,200);
register.setVisible(true);
register.add(regFrame);
new MainPage().setVisible(false); / THIS DOES NOT WORK
}
});
add(regButton, gbc);
logButton = new JButton("Log in");
gbc.ipadx = 40;
gbc.gridx = 0;
gbc.gridy = 2;
add(logButton, gbc);
listButton = new JButton("Customer list");
gbc.ipadx = 40;
gbc.gridx = 0;
gbc.gridy = 3;
add(listButton, gbc);
JFrame home = new JFrame();
home.setTitle("Main menu");
home.setSize(300,200);
home.setResizable(false);
home.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
home.setVisible(true);
home.add (mainFrame);
}
public static void main(String[] args) {
// TODO code application logic here
MainPage mainFrame = new MainPage();
}
}
RegisterPage.java
注册页面
package Practice_1;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
/**
*
* @author Ivan
*/
public class RegisterPage extends JPanel {
//JButton regButton, logButton, listButton;
JLabel homeMessage;
GridBagConstraints gbc = new GridBagConstraints();
public RegisterPage()
{
setLayout(new GridBagLayout());
gbc.insets = new Insets(5,5,5,5);
homeMessage = new JLabel("Register new user:");
gbc.gridx = 0;
gbc.gridy = 0;
add(homeMessage, gbc);
}
}
回答by Branislav Lazic
Acording to your code you are trying to hide JPanelinstead of JFrame. My suggestion is to use
根据您的代码，您试图隐藏JPanel而不是JFrame. 我的建议是使用
public class MainPage extends JFrame
than instantiate your JPanellike this:
而不是JPanel像这样实例化你：
JPanel panel = new JPanel();
and to add components on that panel. To hide your MainPage you can call:
并在该面板上添加组件。要隐藏您的 MainPage，您可以调用：
this.setVisible(false);
but it would be better if you use:
但如果你使用它会更好：
this.dispose();
