LibGDX Tutorial - Hello World , Link : http://devahoy.com/2014/04/libgdx-tutorial-hello-world/

AndroidLauncher.java

public class AndroidLauncher extends AndroidApplication {
    @Override
    protected void onCreate (Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        AndroidApplicationConfiguration config = new AndroidApplicationConfiguration();
        initialize(new MyGame(), config);
    }
}

Desktop.java

public class DesktopLauncher {
    public static void main (String[] arg) {
        LwjglApplicationConfiguration config = new LwjglApplicationConfiguration();
        config.title = "Learn LibGDX #2 - Hello World ";
        config.width = 500;
        config.height = 500;
        new LwjglApplication(new MyGame(), config);
    }
}

MyGame.java

import com.badlogic.gdx.ApplicationListener;

public class MyGame implements ApplicationListener {
    @Override
    public void create() {
 
    }

    @Override
    public void resize(int width, int height) {

    }

    @Override
    public void render() {

    }

    @Override
    public void pause() {

    }

    @Override
    public void resume() {

    }

    @Override
    public void dispose() {

    }
}

MyGame2.java

import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;

public class MyGame extends ApplicationAdapter {
    SpriteBatch batch;
    Texture img;

    @Override
    public void create () {
        batch = new SpriteBatch();
        img = new Texture("badlogic.jpg");
    }

    @Override
    public void render () {
        Gdx.gl.glClearColor(1, 0, 0, 1);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
        batch.begin();
        batch.draw(img, 0, 0);
        batch.end();
    }
}

MyGame3.java

import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Gdx;
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;

public class MyGame extends ApplicationAdapter {
    SpriteBatch batch;
    Texture img;
        BitmapFont font;

    @Override
    public void create () {
        batch = new SpriteBatch();
        img = new Texture("badlogic.jpg");
                font = new BitmapFont();
                font.setColor(Color.WHITE);
    }

    @Override
    public void render () {
        Gdx.gl.glClearColor(0, 1, 0, 1);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
        batch.begin();
        // batch.draw(img, 0, 0);
                font.draw(batch, "Hello World", 300, 300);
        batch.end();
    }
}