Simple libGDX app

TestApp.java

import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application;
import com.badlogic.gdx.backends.lwjgl3.Lwjgl3ApplicationConfiguration;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.BitmapFont;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.utils.viewport.FitViewport;
import com.badlogic.gdx.utils.viewport.Viewport;

public class TestApp extends ApplicationAdapter {
    public static final int width = 1280;
    public static final int height = 720;
    protected SpriteBatch batch;
    protected Viewport view;
    protected BitmapFont font;

    @Override
    public void create() {
        batch = new SpriteBatch();
        view = new FitViewport(width, height);
        font = new BitmapFont();
    }
  
    @Override
    public void render() {
        Gdx.gl.glClearColor(0, 0, 0, 0);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
        view.getCamera().position.set(width / 2, height / 2, 0);
        view.update(width, height);
        batch.setProjectionMatrix(view.getCamera().combined);
        batch.begin();
        font.setColor(Color.BLUE);
        font.draw(batch, "Hello World", width / 2, height / 2);
        batch.end();
    }

    public static void main(String[] arg) {
        Lwjgl3ApplicationConfiguration config = new Lwjgl3ApplicationConfiguration();
        config.setTitle( "Test App");
        config.setWindowedMode(width, height);
        config.setIdleFPS(10);
        final TestApp app = new TestApp();
        new Lwjgl3Application(app, config);
    }
}