actionlistener

来源： https://stackoverflow.com/questions/64433071/sending-a-text-from-jtextfield-to-another-jtextfield-using-the-enter-button

来源： https://stackoverflow.com/questions/63650820/checking-options-in-empty-infinite-loop-vs-dosomething-infite-loop

问题 If I understand correctly then when I create GUI swing components, for example I have this: public class frameExample extends JFrame{ public frameExample(){ //Here adding bunch if components setVisible(true); } } So as long as I don't call the setVisible method the components are being made from the thread the instance was created. So if in a class where i have my main method write: JFrame test=new frameExample(); and I sysout Thread.currentThread.getName(); in the constructor in frameExample

问题 I've created a simple JTable with check box like below: DefaultTableModel model = new DefaultTableModel(); jTable1.setModel(model); model.addColumn("No:", no1); model.addColumn("Remark", remark1); model.addColumn("Color", colors1); model.addColumn("Done"); TableColumn col1 = jTable1.getColumnModel().getColumn(0); col1.setPreferredWidth(1); TableColumn col4 = jTable1.getColumnModel().getColumn(3); col4.setCellEditor(jTable1.getDefaultEditor(Boolean.class)); col4.setCellRenderer(jTable1

问题 I've created a simple JTable with check box like below: DefaultTableModel model = new DefaultTableModel(); jTable1.setModel(model); model.addColumn("No:", no1); model.addColumn("Remark", remark1); model.addColumn("Color", colors1); model.addColumn("Done"); TableColumn col1 = jTable1.getColumnModel().getColumn(0); col1.setPreferredWidth(1); TableColumn col4 = jTable1.getColumnModel().getColumn(3); col4.setCellEditor(jTable1.getDefaultEditor(Boolean.class)); col4.setCellRenderer(jTable1

问题 I am following a Java tutorial at https://youtu.be/64V8CC7nSok. I have copied the code 100% from the video, but still I get this error: Board is not abstract and does not override abstract method actionPerformed(ActionEvent) in ActionListener I have already searched for similar cases, but it didn't help. Here is the file with the error, Board.java , which is sufficient to reproduce the problem: import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Board extends JPanel

问题 I have a JButton, which, as soon as I click on it, I want to change some colors after a few seconds, for example from blue -> 1 sec -> red -> 1 sec -> yellow. My problem is that, as soon as I use the Thread.sleep function in ActionListener and I test my program, it freezes for the 2 seconds and gives me directly yellow. How can I fix that? Thanks a lot 回答1: ActionListener and Thread.sleep.. ..don't play well together. Don't block the EDT (Event Dispatch Thread) - the GUI will 'freeze' when

问题 I have a JButton, which, as soon as I click on it, I want to change some colors after a few seconds, for example from blue -> 1 sec -> red -> 1 sec -> yellow. My problem is that, as soon as I use the Thread.sleep function in ActionListener and I test my program, it freezes for the 2 seconds and gives me directly yellow. How can I fix that? Thanks a lot 回答1: ActionListener and Thread.sleep.. ..don't play well together. Don't block the EDT (Event Dispatch Thread) - the GUI will 'freeze' when

问题 Here is my question with a short sample code: double num = 0.00; try { num = Double.parseDouble(JOptionPane.showInputDialog("Enter your num:")); } catch (Exception e) { System.err.println("Error: Invalid Input!"); JOptionPane.showMessageDialog(null, "Error: Invalid Input!", "Error", JOptionPane.ERROR_MESSAGE); } //Validate the num if (num > 0.0 && num <= 1000.00) { functionA(); } else if (deposit <= 0.0 || deposit > 1000.00) { System.err.println("Error: out of range"); } *The Problem with the

问题 Hi i am trying to implement Action listener for JButton and code look like following: ImageIcon imageForOne = new ImageIcon(getClass().getResource("resources//one.png")); one = new JButton("",imageForOne); one.setPreferredSize( new Dimension(78, 76)); one.addActionListener(myButtonHandler); Using the above JButton it looks fine When i add specific value to button for e.g. ImageIcon imageForOne = new ImageIcon(getClass().getResource("resources//one.png")); //Check this one = new JButton("one"