BasicGui

public class BasicGui extends GuiScreen {
    public final EntityPlayer thePlayer;

    public BasicGui(EntityPlayer player) {
        thePlayer = player;
    }

    private final String[] classNames = {"Miner", "Blacksmith", "Farmer", "Warrior", "Stealth", "Woodsman", "Spellbinder"};

    @Override
    public void initGui() {
        this.buttonList.clear();

        int x, y = width/2 - 30;

        for(int i = 0; i < classNames.length; i++)
        {
            x = (this.width/2 + ((i % 3) * 70 - (70*3) / 2));

            this.buttonList.add(new GuiButton(i, x, y, 70, 20, classNames[i]));

            if(i % 3 == 2)
                y += 20;
        }
    }

    @Override
    protected void actionPerformed(GuiButton par1GuiButton) {
        super.actionPerformed(par1GuiButton);
    }

    @Override
    public void drawDefaultBackground() {
        this.mc.bindTexture(/*texture path*/);
        //DrawBackground
    }

    @Override
    public void drawScreen(){
        this.drawDefaultBackground();
        super.drawScreen();
    }
}