//ITexturePack.Java:
public interface ITexturePack
{
     InputStream getResourceAsStream(String var1);
}

//TexturePackImplementation.java:
public abstract class TexturePackImplementation implements ITexturePack
{
    public InputStream getResourceAsStream(String par1Str)
    {
        return ITexturePack.class.getResourceAsStream(par1Str);
    }
}