java - Libgdx MainMenuScreen -

i trying learn use libgdx engine. tutorial (https://code.google.com/p/libgdx/wiki/extendedsimpleapp) on website of libgdx describes, tried set little main menu. have imported classes needed, @ line 29 there error: "mainmenuscreen can not resolved type". here source code:

package com.me.mygdxgame;  import java.awt.splashscreen;  import com.badlogic.gdx.applicationlistener; import com.badlogic.gdx.game; import com.badlogic.gdx.gdx; import com.badlogic.gdx.graphics.gl10; import com.badlogic.gdx.graphics.orthographiccamera; import com.badlogic.gdx.graphics.texture; import com.badlogic.gdx.graphics.g2d.bitmapfont; import com.badlogic.gdx.graphics.g2d.sprite; import com.badlogic.gdx.graphics.g2d.spritebatch;    public class mygdxgame implements applicationlistener { private orthographiccamera camera; private spritebatch batch; private texture texture; private sprite sprite; private bitmapfont font;      @override public void create() {           batch = new spritebatch();     //use libgdx's default arial font.     font = new bitmapfont();     this.setscreen(new mainmenuscreen(this)); }  @override public void dispose() {     batch.dispose();     texture.dispose(); }  @override public void render() {           gdx.gl.glclearcolor(1, 1, 1, 1);     gdx.gl.glclear(gl10.gl_color_buffer_bit);      batch.setprojectionmatrix(camera.combined);     batch.begin();     sprite.draw(batch);     batch.end(); }  @override public void resize(int width, int height) { }  @override public void pause() { }  @override public void resume() { } 

}

mainmenuscreen not standard-class, if read further in tutorial have linked see created additional class "mainmenuscreen", create class named "mainmenuscreen" , add code tutorial there.

if first time java might want google java tutorials learn fundementals of java , oop first before use external libraries ;)