Revert Java 1.8 changes. Buildable with Java 1.7

There are still active users on Java 1.7, so building with Java 8
was a no-no. This change reverts the recent migration to Java 8,
allowing JDK 1.7 to compile the code.

This means, at least for the time being, no more Lambda expressions
(Boooooooooooooooo!!)

src/main/java/com/loomcom/symon/ui/BreakpointsWindow.java

@@ -30,7 +30,10 @@ import org.slf4j.LoggerFactory;
 
 import javax.swing.*;
 import javax.swing.border.EmptyBorder;
+import javax.swing.event.ListSelectionEvent;
+import javax.swing.event.ListSelectionListener;
 import java.awt.*;
+import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 
 /**
@@ -62,21 +65,24 @@ public class BreakpointsWindow extends JFrame {
         breakpointsPanel.setLayout(new BorderLayout());
         breakpointsPanel.setBorder(new EmptyBorder(10, 10, 10, 10));
 
-        JButton addButton = new JButton("Add");
-        JButton removeButton = new JButton("Del");
+        final JButton addButton = new JButton("Add");
+        final JButton removeButton = new JButton("Del");
         removeButton.setEnabled(false);
 
-        JTextField addTextField = new JTextField(4);
+        final JTextField addTextField = new JTextField(4);
 
-        JTable breakpointsTable = new JTable(breakpoints);
+        final JTable breakpointsTable = new JTable(breakpoints);
         breakpointsTable.setShowGrid(true);
         breakpointsTable.setGridColor(Color.LIGHT_GRAY);
         breakpointsTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
-        breakpointsTable.getSelectionModel().addListSelectionListener(e -> {
-            if (e.getFirstIndex() > -1) {
-                removeButton.setEnabled(true);
-            } else {
-                removeButton.setEnabled(false);
+        breakpointsTable.getSelectionModel().addListSelectionListener(new ListSelectionListener() {
+            @Override
+            public void valueChanged(ListSelectionEvent e) {
+                if (e.getFirstIndex() > -1) {
+                    removeButton.setEnabled(true);
+                } else {
+                    removeButton.setEnabled(false);
+                }
             }
         });
 
@@ -86,37 +92,45 @@ public class BreakpointsWindow extends JFrame {
 
         breakpointsPanel.add(scrollPane, BorderLayout.CENTER);
 
-        ActionListener addBreakpointListener = e -> {
-            int value = -1;
+        ActionListener addBreakpointListener = new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                int value;
 
-            String newBreakpoint = addTextField.getText();
+                String newBreakpoint = addTextField.getText();
 
-            if (newBreakpoint == null || newBreakpoint.isEmpty()) {
-                return;
+                if (newBreakpoint == null || newBreakpoint.isEmpty()) {
+                    return;
+                }
+
+                try {
+                    value = (Integer.parseInt(addTextField.getText(), 16) & 0xffff);
+                } catch (NumberFormatException ex) {
+                    logger.warn("Can't parse page number {}", newBreakpoint);
+                    return;
+                }
+
+                if (value < 0) {
+                    return;
+                }
+
+                breakpoints.addBreakpoint(value);
+
+                logger.debug("Added breakpoint ${}", Utils.wordToHex(value));
+
+                addTextField.setText(EMPTY_STRING);
             }
-
-            try {
-                value = (Integer.parseInt(addTextField.getText(), 16) & 0xffff);
-            } catch (NumberFormatException ex) {
-                logger.warn("Can't parse page number {}", newBreakpoint);
-                return;
-            }
-
-            if (value < 0) {
-                return;
-            }
-
-            breakpoints.addBreakpoint(value);
-
-            logger.debug("Added breakpoint ${}", Utils.wordToHex(value));
-
-            addTextField.setText(EMPTY_STRING);
         };
 
         addButton.addActionListener(addBreakpointListener);
         addTextField.addActionListener(addBreakpointListener);
 
-        removeButton.addActionListener(e -> breakpoints.removeBreakpointAtIndex(breakpointsTable.getSelectedRow()));
+        removeButton.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                breakpoints.removeBreakpointAtIndex(breakpointsTable.getSelectedRow());
+            }
+        });
 
         controlPanel.add(addTextField);
         controlPanel.add(addButton);

src/main/java/com/loomcom/symon/ui/PreferencesDialog.java

@@ -97,19 +97,25 @@ public class PreferencesDialog extends Observable implements Preferences {
         JButton applyButton = new JButton("Apply");
         JButton cancelButton = new JButton("Cancel");
 
-        cancelButton.addActionListener(actionEvent -> {
-            updateUi();
-            dialog.setVisible(false);
+        cancelButton.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent actionEvent) {
+                PreferencesDialog.this.updateUi();
+                dialog.setVisible(false);
+            }
         });
 
-        applyButton.addActionListener(actionEvent -> {
-            haltOnBreak = haltOnBreakCheckBox.isSelected();
-            programLoadAddress = hexToInt(programLoadAddressField.getText());
-            updateUi();
-            // TODO: Actually check to see if values have changed, don't assume.
-            setChanged();
-            PreferencesDialog.this.notifyObservers();
-            dialog.setVisible(false);
+        applyButton.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent actionEvent) {
+                haltOnBreak = haltOnBreakCheckBox.isSelected();
+                programLoadAddress = PreferencesDialog.this.hexToInt(programLoadAddressField.getText());
+                PreferencesDialog.this.updateUi();
+                // TODO: Actually check to see if values have changed, don't assume.
+                PreferencesDialog.this.setChanged();
+                PreferencesDialog.this.notifyObservers();
+                dialog.setVisible(false);
+            }
         });
 
         buttonsContainer.add(applyButton);

src/main/java/com/loomcom/symon/ui/StatusPanel.java

@@ -31,6 +31,8 @@ import javax.swing.*;
 import javax.swing.border.Border;
 import javax.swing.border.EtchedBorder;
 import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
 
 /**
  * UI component that displays the current state of the simulated CPU.
@@ -162,59 +164,74 @@ public class StatusPanel extends JPanel {
         yField = makeTextField(SMALL_TEXT_FIELD_SIZE, true);
 
         // Make fields editable
-        pcField.addActionListener(e -> {
-            try {
-                int newVal = getHexVal(pcField) & 0xffff;
-                machine.getCpu().setProgramCounter(newVal);
-            } catch (Exception ex) {
-                // Swallow exception
-            }
+        pcField.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                try {
+                    int newVal = StatusPanel.this.getHexVal(pcField) & 0xffff;
+                    machine.getCpu().setProgramCounter(newVal);
+                } catch (Exception ex) {
+                    // Swallow exception
+                }
 
-            updateState();
+                StatusPanel.this.updateState();
+            }
         });
 
-        spField.addActionListener(e -> {
-            try {
-                int newVal = getHexVal(spField) & 0xff;
-                machine.getCpu().setStackPointer(newVal);
-            } catch (Exception ex) {
-                // Swallow exception
-            }
+        spField.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                try {
+                    int newVal = StatusPanel.this.getHexVal(spField) & 0xff;
+                    machine.getCpu().setStackPointer(newVal);
+                } catch (Exception ex) {
+                    // Swallow exception
+                }
 
-            updateState();
+                StatusPanel.this.updateState();
+            }
         });
 
-        aField.addActionListener(e -> {
-            try {
-                int newVal = getHexVal(aField) & 0xff;
-                machine.getCpu().setAccumulator(newVal);
-            } catch (Exception ex) {
-                // Swallow exception
-            }
+        aField.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                try {
+                    int newVal = StatusPanel.this.getHexVal(aField) & 0xff;
+                    machine.getCpu().setAccumulator(newVal);
+                } catch (Exception ex) {
+                    // Swallow exception
+                }
 
-            updateState();
+                StatusPanel.this.updateState();
+            }
         });
 
-        xField.addActionListener(e -> {
-            try {
-                int newVal = getHexVal(xField) & 0xff;
-                machine.getCpu().setXRegister(newVal);
-            } catch (Exception ex) {
-                // Swallow exception
-            }
+        xField.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                try {
+                    int newVal = StatusPanel.this.getHexVal(xField) & 0xff;
+                    machine.getCpu().setXRegister(newVal);
+                } catch (Exception ex) {
+                    // Swallow exception
+                }
 
-            updateState();
+                StatusPanel.this.updateState();
+            }
         });
 
-        yField.addActionListener(e -> {
-            try {
-                int newVal = getHexVal(yField) & 0xff;
-                machine.getCpu().setYRegister(newVal);
-            } catch (Exception ex) {
-                // Swallow exception
-            }
+        yField.addActionListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                try {
+                    int newVal = StatusPanel.this.getHexVal(yField) & 0xff;
+                    machine.getCpu().setYRegister(newVal);
+                } catch (Exception ex) {
+                    // Swallow exception
+                }
 
-            updateState();
+                StatusPanel.this.updateState();
+            }
         });
 
         constraints.anchor = GridBagConstraints.LINE_START;

src/main/java/com/loomcom/symon/ui/VideoWindow.java

@@ -122,10 +122,13 @@ public class VideoWindow extends JFrame implements DeviceChangeListener {
      */
     private class CursorBlinker implements Runnable {
         public void run() {
-            SwingUtilities.invokeLater(() -> {
-                if (cursorBlinkRate > 0) {
-                    hideCursor = !hideCursor;
-                    repaint();
+            SwingUtilities.invokeLater(new Runnable() {
+                @Override
+                public void run() {
+                    if (cursorBlinkRate > 0) {
+                        hideCursor = !hideCursor;
+                        VideoWindow.this.repaint();
+                    }
                 }
             });
         }