Java Swing GUI scheint nicht

Question

Ich versuche, eine GUI basierend auf BorderLayout und GridLayout von Hand schreiben nicht mit einem Formular-Generator. Aus diesem Grund überspringe ich wahrscheinlich einen Teil des Codes. Es ist geladen, aber nicht zu sehen.

import java.awt.*; 
import java.awt.event.*; 
import java.io.IOException; 
import java.net.InetAddress; 
import javax.swing.*; 
import javax.swing.border.EmptyBorder; 


class PanelDemo { 

    JButton jbtnUpArrowFirst; 
    JButton jbtnDownArrowFirst; 
    JButton jbtnUpArrowSec; 
    JButton jbtnDownArrowSec; 
    JButton jbtnUpArrowThird; 
    JButton jbtnDownArrowThird; 

    JLabel jlblLedUpFirst; 
    JLabel jlblLedDownFirst; 
    JLabel jlblLedUpSec; 
    JLabel jlblLedDownSec; 
    JLabel jlblLedUpThird; 
    JLabel jlblLedDownThird; 

    private JComponent ui = null; 
    private Insets buttonMargin = new Insets(10,10,10,10); 

    PanelDemo() throws IOException { 

     InitComponents(); 
    } 

    private void InitComponents() { 

     if (ui != null) return; 

     ui = new JPanel(new BorderLayout(4,4)); 
     ui.setBorder(new EmptyBorder(4,4,4,4)); 

     int gap = 5; 


     JPanel jpnl = new JPanel(new GridLayout(2, 4, gap, gap)); 
     jpnl.setBorder(new EmptyBorder(0, 0, 0, 50)); 
     jpnl.setOpaque(true); 
     jpnl.setBorder(
       BorderFactory.createLineBorder(Color.BLUE)); 


     JPanel jpnl2 = new JPanel(new GridLayout(2, 2, gap, gap)); 
     jpnl2.setOpaque(true); 
     jpnl2.setBorder(
       BorderFactory.createLineBorder(Color.RED)); 





     jbtnUpArrowFirst = new JButton("upfirst" ,new ImageIcon("/Users/Jack/Desktop/up.png")); 
     jbtnUpArrowFirst.setVerticalTextPosition(SwingConstants.BOTTOM); 
     jbtnUpArrowFirst.setHorizontalTextPosition(SwingConstants.CENTER); 

     jbtnDownArrowFirst = new JButton("downfirst" ,new ImageIcon("/Users/Jack/Desktop/down.png")); 
     jbtnDownArrowFirst.setVerticalTextPosition(SwingConstants.BOTTOM); 
     jbtnDownArrowFirst.setHorizontalTextPosition(SwingConstants.CENTER); 


     jlblLedUpFirst = new JLabel("upledfirst", new ImageIcon("/Users/Jack/Desktop/ledOff.png"), SwingConstants.CENTER); 
     jlblLedUpFirst.setVerticalTextPosition(SwingConstants.BOTTOM); 
     jlblLedUpFirst.setHorizontalTextPosition(SwingConstants.CENTER); 


     jlblLedDownFirst = new JLabel("downledfirst", new ImageIcon("/Users/Jack/Desktop/ledOff.png"), SwingConstants.CENTER); 
     jlblLedDownFirst.setVerticalTextPosition(SwingConstants.BOTTOM); 
     jlblLedDownFirst.setHorizontalTextPosition(SwingConstants.CENTER); 


     //////////////////////////////////////////////////////////////////////// 
     jbtnUpArrowSec = new JButton("upsec", new ImageIcon("/Users/Jack/Desktop/up.png")); 
     jbtnUpArrowSec.setVerticalTextPosition(SwingConstants.BOTTOM); 
     jbtnUpArrowSec.setHorizontalTextPosition(SwingConstants.CENTER); 

     jbtnDownArrowSec = new JButton("downsec" ,new ImageIcon("/Users/Jack/Desktop/down.png")); 
     jbtnDownArrowSec.setVerticalTextPosition(SwingConstants.BOTTOM); 
     jbtnDownArrowSec.setHorizontalTextPosition(SwingConstants.CENTER); 


     jlblLedUpSec = new JLabel("upledsecond", new ImageIcon("/Users/Jack/Desktop/ledOff.png"), SwingConstants.CENTER); 
     jlblLedUpSec.setVerticalTextPosition(SwingConstants.BOTTOM); 
     jlblLedUpSec.setHorizontalTextPosition(SwingConstants.CENTER); 

     jlblLedDownSec = new JLabel("downledsec", new ImageIcon("/Users/Jack/Desktop/ledOff.png"), SwingConstants.CENTER); 
     jlblLedDownSec.setVerticalTextPosition(SwingConstants.BOTTOM); 
     jlblLedDownSec.setHorizontalTextPosition(SwingConstants.CENTER); 
     //////////////////////////////////////////////////////////////////////// 
     jbtnUpArrowThird = new JButton("upthirt", new ImageIcon("/Users/Jack/Desktop/up.png")); 
     jbtnUpArrowThird.setVerticalTextPosition(SwingConstants.BOTTOM); 
     jbtnUpArrowThird.setHorizontalTextPosition(SwingConstants.CENTER); 

     jbtnDownArrowThird = new JButton("downthird" ,new ImageIcon("/Users/Jack/Desktop/down.png")); 
     jbtnDownArrowThird.setVerticalTextPosition(SwingConstants.BOTTOM); 
     jbtnDownArrowThird.setHorizontalTextPosition(SwingConstants.CENTER); 


     jlblLedUpThird = new JLabel("upledthird", new ImageIcon("/Users/Jack/Desktop/ledOff.png"), SwingConstants.CENTER); 
     jlblLedUpThird.setVerticalTextPosition(SwingConstants.BOTTOM); 
     jlblLedUpThird.setHorizontalTextPosition(SwingConstants.CENTER); 

     jlblLedDownThird = new JLabel("downledthird", new ImageIcon("/Users/Jack/Desktop/ledOff.png"), SwingConstants.CENTER); 
     jlblLedDownThird.setVerticalTextPosition(SwingConstants.BOTTOM); 
     jlblLedDownThird.setHorizontalTextPosition(SwingConstants.CENTER); 


     // Add the buttons and label to the panel. 
     jpnl.add(jbtnUpArrowFirst); 
     jpnl.add(jlblLedUpFirst); 
     jpnl.add(jbtnUpArrowSec); 
     jpnl.add(jlblLedUpSec); 
     jpnl.add(jbtnDownArrowFirst); 
     jpnl.add(jlblLedDownFirst); 
     jpnl.add(jbtnDownArrowSec); 
     jpnl.add(jlblLedDownSec); 

     jpnl2.add(jbtnUpArrowThird); 
     jpnl2.add(jlblLedUpThird); 
     jpnl2.add(jbtnDownArrowThird); 
     jpnl2.add(jlblLedDownThird); 


     ui.add(jpnl, BorderLayout.CENTER); 
     ui.add(jpnl2, BorderLayout.LINE_END); 

     JFrame jfrm = new JFrame("Use Two JPanels"); 
     jfrm.setLocationByPlatform(true); 
     jfrm.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); 
     jfrm.setContentPane(getUI()); 
     jfrm.setMinimumSize(jfrm.getSize()); 
     jfrm.pack(); 
     jfrm.setVisible(true); 

     /*jbtnUpArrowFirst.addActionListener(e -> { 
      try { 
       test.send("ANTSW=VERT\r\n"); 

       //if (test.recv().equalsIgnoreCase("")) 

      } catch (IOException e1) { 
       e1.printStackTrace(); 
      } 
     }); 

     jbtnDownArrowFirst.addActionListener(e -> { 
      try { 
       test.send("ANTSW=HORZ\r\n"); 
      } catch (IOException e1) { 
       e1.printStackTrace(); 
      } 
     });*/ 

    } 

    public JComponent getUI() { 
     return ui; 
    } 

    public static void main(String args[]) { 
     // Create the frame on the event dispatching thread. 
     SwingUtilities.invokeLater(() -> { 
       try { 
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
        new PanelDemo(); 
       } catch (IOException e) { 
        e.printStackTrace(); 
       } catch (IllegalAccessException e) { 
        e.printStackTrace(); 
       } catch (InstantiationException e) { 
        e.printStackTrace(); 
       } catch (UnsupportedLookAndFeelException e) { 
        e.printStackTrace(); 
       } catch (ClassNotFoundException e) { 
        e.printStackTrace(); 
       } 
     }); 
    } 
} 

Answer 1

Sie rufen pack() und setVisible(), bevor Sie alle Komponenten der JFrame hinzufügen. Verschieben Sie den Block, der das tut, an das Ende des Konstruktors.

Darüber hinaus kann mein Compiler test nirgendwo in dem Code finden, der Aktion Listener einrichten. Ich habe nicht mit Java 8 gearbeitet, also weiß ich nicht, was dort nicht stimmt, aber Eclipse sollte in der Lage sein, dies ohne Fehler zu kompilieren.