style: resolve compiler warnings

jadx-core/src/test/java/jadx/tests/integration/generics/TestGenericsMthOverride.java

@@ -36,6 +36,7 @@ public class TestGenericsMthOverride extends IntegrationTest {
 			}
 		}
 
+		@SuppressWarnings("unchecked")
 		public static class D<X, Y> implements I<X, Y> {
 			@Override
 			public Object method(Object x) {

jadx-gui/src/main/java/jadx/gui/ui/codearea/AbstractCodeArea.java

@@ -20,6 +20,8 @@ import jadx.gui.ui.MainWindow;
 import jadx.gui.utils.JumpPosition;
 
 public abstract class AbstractCodeArea extends RSyntaxTextArea {
+	private static final long serialVersionUID = -3980354865216031972L;
+
 	private static final Logger LOG = LoggerFactory.getLogger(AbstractCodeArea.class);
 
 	protected final ContentPanel contentPanel;

jadx-gui/src/main/java/jadx/gui/ui/codearea/AbstractCodeContentPanel.java

@@ -8,6 +8,7 @@ import jadx.gui.ui.TabbedPane;
  * The abstract base class for a content panel that show text based code or a.g. a resource
  */
 public abstract class AbstractCodeContentPanel extends ContentPanel {
+	private static final long serialVersionUID = 4685846894279064422L;
 
 	protected AbstractCodeContentPanel(TabbedPane panel, JNode jnode) {
 		super(panel, jnode);

jadx-gui/src/main/java/jadx/gui/ui/codearea/CodePanel.java

@@ -17,11 +17,13 @@ import jadx.gui.utils.UiUtils;
  * A panel combining a {@link SearchBar and a scollable {@link CodeArea}
  */
 public class CodePanel extends JPanel {
+	private static final long serialVersionUID = 1117721869391885865L;
 
 	private final SearchBar searchBar;
 	private final AbstractCodeArea codeArea;
 	private final JScrollPane codeScrollPane;
 
+	@SuppressWarnings("serial")
 	public CodePanel(ContentPanel contentPanel, AbstractCodeArea codeArea) {
 		this.codeArea = codeArea;
 		searchBar = new SearchBar(codeArea);