Question

有一个包含一些组件的类，比如带有按钮等的jpanel。当我从这个类中的main方法运行这个类时，它工作正常。问题是，当我尝试从另一个类运行此类构造函数时，组件会令人失望。

function upd!(w,A,i,c)
  rowval = A.rowval
  nzval = A.nzval
  @inbounds for j = nzrange(A,i)
    w[rowval[j]] += c* nzval[j]
  end
  return w
end

@time for i=1:100000
  upd!(w,A,i,1)
end
0.500323 seconds (99.49 k allocations: 1.518 MB)

当我尝试从我的另一个班级CanvasFrame canvas = new CanvasFrame("Web Cam"); CanvasFrame capturecanvas =new CanvasFrame("Preview"); Canvas capturecanva = new Canvas(); JPanel controlPanel = new JPanel(); JLabel capturepanel=new JLabel(); JButton captureBtn; JButton acceptBtn; JButton retakeBtn; String currentCapture; JPanel panel = new JPanel(); int total_Faces; public FaceDetector(int interruptionCommnand) throws IOException { captureInterrupt(); } public FaceDetector() throws IOException, FrameGrabber.Exception { FrameGrabber grabber = new VideoInputFrameGrabber(0); canvas.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE); capturecanvas.setDefaultCloseOperation(javax.swing.JFrame.DISPOSE_ON_CLOSE); canvas.setSize(800,600); canvas.setLayout(new MigLayout("insets 0, gap 10" )); Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize(); int locationX = (screenSize.width-240) / 2; int locationY = (screenSize.height -550) / 2; canvas.setBounds(locationX, locationY,840, 550); panel.add(captureBtn = new JButton("Capture"), " w 100:100:100, h 40:40:40"); controlPanel.add(acceptBtn =new JButton("Accept"), "w 100:100:100, h 40:40:40"); controlPanel.add(retakeBtn=new JButton("Retake"), "w 100:100:100, h 40:40:40"); ActionListener RetakeActionListener = new RetakeActionListener(); retakeBtn.addActionListener(RetakeActionListener); ActionListener AcceptActionListener = new AcceptActionListener(); acceptBtn.addActionListener(AcceptActionListener); ActionListener CaptureActionListener = new CaptureActionListener(); captureBtn.addActionListener(CaptureActionListener); canvas.add(panel,"south"); capturecanvas.setLayout(new MigLayout("wrap 3")); capturecanvas.setVisible(false); } public static void main(String[] args) throws IOException, FrameGrabber.Exception { new FaceDetector(); }运行它时，组件丢失了

更改后的代码：

new FaceDetector();

Answer 1

尝试在Runnable内运行。

Thread thread = new Thread(new Runnable(){
     public void run() {
         new FaceDetector();
     }
});

thread.start();

修改

thread.start(); while(thread.isAlive()){}; try { DatabaseConnectivity ndbc = new DatabaseConnectivity("select",""); ndbc.FrameShow(); } catch (SQLException ex) { Logger.getLogger(RegisterService.class.getName()).log(Level.SEVERE, null, ex); }

如果从另一个类运行一个类，如何修复组件显示？

1 个答案: