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import org.l  }/** * Render the current frame */private static void render() {  // clear the screen  GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_STENCIL_BUFFER_BIT);  // center square according to screen size  GL11.glPushMatrix();  GL11.glTranslatef(Display.getDisplayMode().getWidth() / 2, Display.getDisplayMode().getHeight() / 2, 0.0f);    // rotate square according to angle   // GL11.glRotatef(angle, 0, 0, 1.0f);    // render the square    GL11.glBegin(GL11.GL_QUADS);      GL11.glVertex2i(-200, -200);      GL11.glVertex2i(200, -200);      GL11.glVertex2i(200, 200);      GL11.glVertex2i(-200, 200);    GL11.glEnd();  GL11.glPopMatrix();}}