java java更新Jpanel组件
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java update Jpanel component
提问by Qaiser Mehmood
I am using a Custome jPanel in my Gui Builder JFram Class A, the problem i am facing is to update the components (Lable) in my JPanel when I click button in JFrame.here is the button in Gui Builder JFrame ClassA: it changes the color of Jpl and also remove all the labels but not update the new labels.
我在 Gui Builder JFram Class A 中使用 Custome jPanel，我面临的问题是当我单击 JFrame 中的按钮时更新 JPanel 中的组件（Lable）。这里是 Gui Builder JFrame ClassA 中的按钮：它改变了Jpl 的颜色，并删除所有标签但不更新新标签。
private void btnShowActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
Random randomGenerator = new Random();
for (int idx = 1; idx <= 10; ++idx) {
q = randomGenerator.nextInt(100);
}
jpl1.removeAll();
new Jpl().printMe(ClassA.q);
jpl1.revalidate();
jpl1.setBackground(Color.BLUE);
jpl1.repaint();
}
here is Jpl class that is used as a custome component in GuiBuilder JFrame Class A.
这是在 GuiBuilder JFrame Class A 中用作客户组件的 Jpl 类。
public class Jpl extends JPanel {
public Jpl() {
printMe(ClassA.q);
}
public void printMe(int q) {
for (int i = 0; i <q; i++) {
System.out.println(i+"rinting lable");
String htmlLabel = "<html><font color=\"#A01070\">" + i + " New Lable </font></html>";
JLabel lbl = new JLabel(htmlLabel);
setLayout(new GridLayout(0, 1));
add(lbl, Jpl.RIGHT_ALIGNMENT);
lbl.setForeground(Color.BLUE);
Border border = BorderFactory.createLineBorder(Color.lightGray);
lbl.setBorder(border);
lbl.add(new JSeparator(SwingConstants.HORIZONTAL));
lbl.addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
JLabel label = (JLabel) e.getSource();
JOptionPane.showMessageDialog(null, "You Slected");
System.out.println(label.getText() + "NO AKKA is Selected");
}
});
}
}
回答by JPelletier
You are calling printMe() on a new instance of Jpl, try that:
您正在 Jpl 的新实例上调用 printMe()，请尝试：
private void btnShowActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
Random randomGenerator = new Random();
for (int idx = 1; idx <= 10; ++idx) {
q = randomGenerator.nextInt(100);
}
jpl1.removeAll();
jpl1.printMe(ClassA.q); // HERE - REMOVED new and using jpl1 instance
jpl1.setBackground(Color.BLUE);
jpl1.revalidate();
jpl1.repaint();
}
In don't understand why you loop 10 times for your random number. Only the last result will be kept, maybe a you wanted to use q += randomGenerator.nextInt(100);. Also, ClassA.qshould be replaced by qif it's the same variable.
不明白为什么你的随机数循环 10 次。只会保留最后一个结果，也许您想使用q += randomGenerator.nextInt(100);. 此外，如果它是相同的变量，ClassA.q则应替换q。
