Fix generics-related warnings

Author: ctrueden

src/main/java/org/scijava/ui/swing/widget/SwingChoiceRadioWidget.java

@@ -84,7 +84,7 @@ public void set(final WidgetModel model) {
 		final ButtonGroup buttonGroup = new ButtonGroup();
 		final JPanel buttonPanel = new JPanel();
 		buttonPanel.setLayout(new BoxLayout(buttonPanel, getBoxAxis(model)));
-		radioButtons = new ArrayList<JRadioButton>(items.length);
+		radioButtons = new ArrayList<>(items.length);
 
 		for (final String item : items) {
 			final JRadioButton radioButton = new JRadioButton(item);

src/main/java/org/scijava/ui/swing/widget/SwingObjectWidget.java

@@ -51,7 +51,7 @@ public class SwingObjectWidget extends SwingInputWidget<Object> implements
 	ActionListener, ObjectWidget<JPanel>
 {
 
-	private JComboBox comboBox;
+	private JComboBox<Object> comboBox;
 
 	// -- ActionListener methods --
 
@@ -73,7 +73,7 @@ public Object getValue() {
 	public void set(final WidgetModel model) {
 		super.set(model);
 
-		comboBox = new JComboBox(model.getObjectPool().toArray());
+		comboBox = new JComboBox<>(model.getObjectPool().toArray());
 		setToolTip(comboBox);
 		getComponent().add(comboBox);
 		comboBox.addActionListener(this);