None 的 JPanel 中的元素显示在 JFrame 中

Question

我已经寻找了几个小时的类似问题，但我对这个问题一无所知。希望有人能帮助我。

这里是 class SimulatedWindow 除了进口：

public class SimulatedWindow extends JFrame {

    private JFrame defFrame = new JFrame();

    SimulatedWindow() {
        windowsInit();
    }

    private void windowsInit() {
        defFrame.setSize(new Dimension(600, 480));
        defFrame.setTitle("Radar Simulate System");
        defFrame.setLayout(null);
        defFrame.setLocation(100, 100);

        DefPanel defPanel = new DefPanel();
        // this.getContentPane().add(defPanel, BorderLayout.CENTER);
        this.add(new DefPanel());
        defFrame.add(defPanel);
        defFrame.setDefaultCloseOperation(EXIT_ON_CLOSE);
        defFrame.setVisible(true);
    }

    class DefPanel extends JPanel {
        private LeftPanel myLeftPanel;
        private RightPanel myRightPanel;

        public DefPanel() {
            setLayout(null);
            myLeftPanel = new LeftPanel();
            myRightPanel = new RightPanel();

            add(new JButton("Hello World!"));
            add(myLeftPanel);
            add(myRightPanel);
            System.out.println("DefPAnel");
        }
    }


    class LeftPanel extends JPanel {
        private JButton avgSpeedButton = new JButton();
        private JButton trafficColumeButton = new JButton();
        private JLabel avgSpeedLabel = new JLabel();
        private JLabel trifficColumeLabel = new JLabel();
        private JLabel curTimeLabel = new JLabel();

        LeftPanel() {
            setLayout(null);
            this.setBounds(0, 0, this.getSize().width, this.getSize().height);

            SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            curTimeLabel.setText(df.format(new Date()));
            add(curTimeLabel);

            add(avgSpeedButton);

            System.out.println("LeftPanel");
        }
    }
}

主要功能如下：

public class SimulatedWindowTest {

    public static void main(String[] args) {
        SimulatedWindow simulatedWindow = new SimulatedWindow();
    }
}

JPanel中的

None个元素（JButton、JLabel）正在显示。

Answer 1

我相信这可能是您的问题：check it

主要答案是：

This is the problem with absolute positioning (or null layout). It requires you to set the sizes of all your components, otherwise they will stay are their default zero-size and won't appear. That's why it's always better to use a layout manager.

None 的 JPanel 中的元素显示在 JFrame 中

None of the elements in the JPanel display in JFrame

java

user-interface

swing

layout-manager

null-layout-manager