Java:Swing:按下按钮后隐藏框架

Question

我在java框架中有一个按钮,按下它时会从文本字段中读取一个值,并将该字符串用作尝试连接到串行设备的端口名称.

如果此连接成功,则该方法返回true,否则返回false.如果它返回true,我希望框架消失.然后将出现在其他类中指定的一系列其他帧以及控制串行设备的选项.

我的问题是:按钮连接到动作监听器,按下此方法被调用.如果我尝试使用frame.setVisible(true); 方法java抛出一个抽象按钮错误,因为我有效地告诉它在按钮按下方法退出之前消失包含按钮的框架.删除frame.setVisible(true); 允许程序正确运行但是我留下了一个不再有用的延迟连接框架.

按下按钮后如何让框架消失？

package newimplementation1;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;


/**
 *
 * @author Zac
 */

public class ConnectionFrame extends JPanel implements ActionListener {


private JTextField textField;
private JFrame frame;
private JButton connectButton;
private final static String newline = "\n";

public ConnectionFrame(){

    super(new GridBagLayout());

    textField = new JTextField(14);
    textField.addActionListener(this);
    textField.setText("/dev/ttyUSB0");

    connectButton = new JButton("Connect");

    //Add Components to this panel.
    GridBagConstraints c = new GridBagConstraints();
    c.gridwidth = GridBagConstraints.REMAINDER;

    c.fill = GridBagConstraints.HORIZONTAL;
    add(textField, c);

    c.fill = GridBagConstraints.BOTH;
    c.weightx = 1.0;
    c.weighty = 1.0;
    add(connectButton, c);



    connectButton.addActionListener(new ActionListener() {

        public void actionPerformed(ActionEvent e)
        {

            boolean success = Main.mySerialTest.initialize(textField.getText());

            if (success == false) {System.out.println("Could not connect"); return;}

            frame.setVisible(false);  // THIS DOES NOT WORK!!

            JTextInputArea myInputArea = new JTextInputArea();
            myInputArea.createAndShowGUI();

            System.out.println("Connected");


        }
    });

}

    public void actionPerformed(ActionEvent evt) {

            // Unimplemented required for JPanel

    }

    public void createAndShowGUI() {

    //Create and set up the window.
    frame = new JFrame("Serial Port Query");
    frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);


    //Add contents to the window.
    frame.add(new ConnectionFrame());
    frame.setLocation(300, 0);


    //Display the window.
    frame.pack();
    frame.setVisible(true);

            frame.addComponentListener(new ComponentAdapter() {
        @Override
        public void componentHidden(ComponentEvent e) {
            System.out.println("Exiting Gracefully");
            Main.mySerialTest.close();
            ((JFrame)(e.getComponent())).dispose();
            System.exit(0);
        }
    });


}

}

Answer 1

运行你的代码片段(在删除/调整自定义类之后),抛出一个NPE.原因是您访问的帧为空.那是因为它从未设定过.最好不要依赖任何领域,让按钮找到它的顶级祖先并隐藏它,就像在

        public void actionPerformed(final ActionEvent e) {

            boolean success = true;
            if (success == false) {
                System.out.println("Could not connect");
                return;
            }

            Window frame = SwingUtilities.windowForComponent((Component) e
                    .getSource());
            frame.setVisible(false); //no problem :-)

        }