Java Swing Siyah Tema (Dark Nimbus)

Main methodunun içerisine yazarak temanızı siyaha çevirebilirsiniz 

UIManager.put("control", Color.DARK_GRAY);
UIManager.put("info", new Color(128, 128, 128));
UIManager.put("nimbusBase", new Color(18, 30, 49));
UIManager.put("nimbusAlertYellow", new Color(248, 187, 0));
UIManager.put("nimbusDisabledText", new Color(128, 128, 128));
UIManager.put("nimbusFocus", new Color(115, 164, 209));
UIManager.put("nimbusGreen", new Color(176, 179, 50));
UIManager.put("nimbusInfoBlue", new Color(66, 139, 221));
UIManager.put("nimbusLightBackground", new Color(18, 30, 49));
UIManager.put("nimbusOrange", new Color(191, 98, 4));
UIManager.put("nimbusRed", new Color(169, 46, 34));
UIManager.put("nimbusSelectedText", new Color(255, 255, 255));
UIManager.put("nimbusSelectionBackground", new Color(104, 93, 156));
UIManager.put("text", new Color(230, 230, 230));

          try {

                for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {

                     if ("Nimbus".equals(info.getName())) {

                          javax.swing.UIManager.setLookAndFeel(info.getClassName());

                          break;

                     }

                }

          } catch (ClassNotFoundException e) {

                e.printStackTrace();

          } catch (InstantiationException e) {

                e.printStackTrace();

          } catch (IllegalAccessException e) {

                e.printStackTrace();

          } catch (javax.swing.UnsupportedLookAndFeelException e) {

                e.printStackTrace();

          } catch (Exception e) {

                e.printStackTrace();

          }