LibGDX - how do I add a simple button?

Question

I'm greatly confused on this. What is don't understand is how the stage and table layouts exactly work. All i want are 3 buttons that sends me to another screen. Could someone please write out an example for me to work with? Here is the code I have so far.

public class Menu implements Screen {
private SlingshotSteve game;
private Stage stage;
private TextButton button;
private TextButtonStyle textButtonStyle;
private BitmapFont font;
{
stage = new Stage(new ExtendViewport(800, 840));
Gdx.input.setInputProcessor(stage);
Table table = new Table();
table.setFillParent(true);
table.center().center();
stage.addActor(table);
font = new BitmapFont();
textButtonStyle = new TextButtonStyle();
textButtonStyle.font = font;
button = new TextButton("This is a button!!!", textButtonStyle);
stage.addActor(button);
}
// View Port Camera
private Viewport viewport;
PerspectiveCamera camera;
public Menu(SlingshotSteve gam) {
 this.game = gam;
}
@Override
public void render(float delta) {
 Gdx.gl.glClearColor(0, 0, 0.2f, 1);
 Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
 stage.act(Gdx.graphics.getDeltaTime());
 stage.draw();
 camera.update();
 game.batch.setProjectionMatrix(camera.combined);
 game.batch.begin();
 game.batch.end();
 if (Gdx.input.isTouched()) {
 game.setScreen((Screen) new GameScreen(game));
 dispose();
 }
}
@Override
public void resize(int width, int height) {
 // View Port Camera
 viewport.update(width, height); 
 stage.getViewport().update(width, height, true);
}
@Override
public void show() {
 // Viewport Camera
 camera = new PerspectiveCamera();
 viewport = new FitViewport(800, 480, camera);
}
@Override
public void dispose() {
 stage.dispose();
}
}

Answer 1

Don't add the button to the Stage. Instead add it to the Table you have created.

TextButton button1 = new TextButton("This is a button!!!", textButtonStyle);
TextButton button2 = new TextButton("This is a button!!!", textButtonStyle);
TextButton button3 = new TextButton("This is a button!!!", textButtonStyle);
table.add(button1);
table.row();
table.add(button2);
table.row();
table.add(button3);
table.row();