java swing动态添加组件
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java swing dynamically adding components
提问by nantitv
I am new to Java Swing. I have some doubt regarding adiing components dynamically in Swing.
我是 Java Swing 的新手。我对 Swing 中的动态组件有一些疑问。
Basically I hav one Main JPanelconsisting of two sub JPanel(leftpanel and rightpanel ) which alligned horizontally.In left JPanelI hav some JButtons, when I will click on JButtonI nedd to show some JLabel, JTextAreaetc in right JPanel. I tried a code but its not working .When I click on the button its going inside the event listener function but JLabelI am not able to view.
基本上我甲肝一个主要JPanel由两个子JPanel（leftpanel和rightpanel）的神韵：horizontally.In离开JPanel我甲肝一些JButtons，我会点击JButton我NEDD表现出一定的JLabel，JTextArea等右JPanel。我尝试了一个代码，但它不起作用。当我点击按钮时，它会进入事件侦听器函数，但JLabel我无法查看。
I am giving my code below. Pls look at this and correct me. thanks in advance
我在下面给出我的代码。请看看这个并纠正我。提前致谢
package my;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
/**
*
* @author root
*/
public class myAplliwithPanel extends JFrame{
JPanel rightPanel;
public myAplliwithPanel() {
initGui();
}
public void initGui()
{
JPanel mainPanel=new JPanel();
mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.X_AXIS));
JPanel leftPanel=new JPanel();
leftPanel.setLayout(new BoxLayout(leftPanel, BoxLayout.Y_AXIS));
rightPanel=new JPanel();
rightPanel.setLayout(new BoxLayout(rightPanel, BoxLayout.Y_AXIS));
JButton dbBut=new JButton("DB");
JButton appliBut=new JButton("Appli");
appliBut.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
JLabel label=new JLabel("dsggs");
rightPanel.add(label);
}
});
JButton backendBut=new JButton("Backend");
leftPanel.add(dbBut);
leftPanel.add(appliBut);
leftPanel.add(backendBut);
mainPanel.add(leftPanel);
mainPanel.add(rightPanel);
add(mainPanel);
setTitle("System Manger");
setSize(400, 400);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public static void main(String args[]) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
myAplliwithPanel myObj = new myAplliwithPanel();
myObj.setVisible(true);
}
});
}
}
回答by Cameron Skinner
You need to call revalidateafter adding (or removing) components:
revalidate添加（或删除）组件后需要调用：
rightPanel.add(label);
rightPanel.revalidate();
should do the trick.
应该做的伎俩。
回答by StanislavL
call
称呼
rightPanel.revalidate();
rightPanel.repaint();
after adding
添加后
回答by Pratik
just add this line after you add the label
添加标签后只需添加此行
rightPanel.updateUI();
rightPanel.updateUI();
when you add any component at runtime you need to update the ui using this method
当您在运行时添加任何组件时，您需要使用此方法更新 ui
