Examples of java.util.Observer

java.util.Observer
A class can implement the Observer interface when it wants to be informed of changes in observable objects. @author Chris Warth @version 1.20, 11/17/05 @see java.util.Observable @since JDK1.0

        ssLabel.setText("Signal strength (not auto-updated): "
            + String.format("%1.1f", getCurrentSignalStrength()) + " dBm");
      }
    });


    final Observer observer = new Observer() {
      public void update(Observable obs, Object obj) {
        if (isTransmitting()) {
          statusLabel.setText("Transmitting");
        } else if (isReceiving()) {
          statusLabel.setText("Receiving");
        } else {
          statusLabel.setText("Listening");
        }


        lastEventLabel.setText("Last event: " + getLastEvent());
        ssLabel.setText("Signal strength (not auto-updated): "
            + String.format("%1.1f", getCurrentSignalStrength()) + " dBm");
        if (getChannel() == -1) {
          channelLabel.setText("Current channel: ALL");
        } else {
          channelLabel.setText("Current channel: " + getChannel());
        }
      }
    };
    this.addObserver(observer);


    observer.update(null, null);


    panel.add(BorderLayout.NORTH, box);
    panel.putClientProperty("intf_obs", observer);
    return panel;
  }

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    panel.putClientProperty("intf_obs", observer);
    return panel;
  }


  public void releaseInterfaceVisualizer(JPanel panel) {
    Observer observer = (Observer) panel.getClientProperty("intf_obs");
    if (observer == null) {
      logger.fatal("Error when releasing panel, observer is null");
      return;
    }

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    add(BorderLayout.CENTER, controlPanel);


    setSize(370, 100);


    simulation.addObserver(simObserver = new Observer() {
      public void update(Observable obs, Object obj) {
        updateLabels();
      }
    });

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    final JTextArea attributes = new JTextArea();
    attributes.setEditable(false);
    panel.add(attributes);
    attributes.setText(getText());


    Observer observer;
    this.addObserver(observer = new Observer() {
      public void update(Observable obs, Object obj) {
          attributes.setText(getText());
      }
    });

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    return panel;
  }


  public void releaseInterfaceVisualizer(JPanel panel) {
    Observer observer = (Observer) panel.getClientProperty("intf_obs");
    if (observer == null) {
      logger.fatal("Error when releasing panel, observer is null");
      return;
    }
    this.deleteObserver(observer);

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        ssLabel.setText("Signal strength (not auto-updated): "
            + String.format("%1.1f", getCurrentSignalStrength()) + " dBm");
      }
    });


    final Observer observer = new Observer() {
      public void update(Observable obs, Object obj) {
        if (isTransmitting()) {
          statusLabel.setText("Transmitting");
        } else if (isReceiving()) {
          statusLabel.setText("Receiving");
        } else {
          statusLabel.setText("Listening");
        }


        lastEventLabel.setText("Last event (time=" + lastEventTime + "): " + lastEvent);
        ssLabel.setText("Signal strength (not auto-updated): "
            + String.format("%1.1f", getCurrentSignalStrength()) + " dBm");
        if (getChannel() == -1) {
          channelLabel.setText("Current channel: ALL");
        } else {
          channelLabel.setText("Current channel: " + getChannel());
        }
      }
    };
    this.addObserver(observer);


    observer.update(null, null);


    panel.add(BorderLayout.NORTH, box);
    panel.putClientProperty("intf_obs", observer);
    return panel;
  }

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             g.fillOval(x + 5, y + 5, d-10, d-10);
           }
         }
       };


       Observer observer;
       this.addObserver(observer = new Observer() {
         public void update(Observable obs, Object obj) {
           panel.repaint();
         }
       });

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    ipLabel.setText("Rime address: " + getAddressString());


    panel.add(ipLabel);


    Observer observer;
    this.addObserver(observer = new Observer() {
      public void update(Observable obs, Object obj) {
        ipLabel.setText("Rime address: " + getAddressString());
      }
    });

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    return panel;
  }


  public void releaseInterfaceVisualizer(JPanel panel) {
    Observer observer = (Observer) panel.getClientProperty("intf_obs");
    if (observer == null) {
      logger.fatal("Error when releasing panel, observer is null");
      return;
    }

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        sourceCodeUI.updateBreakpoints();
      }
    });


    /* Observe when simulation starts/stops */
    simulation.addObserver(simObserver = new Observer() {
      public void update(Observable obs, Object obj) {
        if (!simulation.isRunning()) {
          stepAction.setEnabled(true);
          showCurrentPC();
        } else {

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