Bouncing Ball with obstacle collision (java)

im a beginner coder (this is my first java course) and i have a project due tomorrow!! Assignment: Use stdDraw to make ball that bounces off the walls with an obstacle that only moves horizontally across the screen (the obstacle also bounces off the walls, side-to-side). Now here is where im having issues: if the ball hits the obstacle, it must bounce off.

here is my code:

public class BouncingBall {
public static void main(String[] args) {
    //Features of the BALL                                                                                                                                                       
    double rx = .0480, ry = .860;
    double vx = .0015, vy = .0023;  //velocity                                                                                                                                   
    double radius = .05;

    //Features of the OBSTACLE                                                                                                                                                   
    double x = -.080, y = -.480;
    double vox = -.002, voy = 0.0;
    double height = .02, width = .15;



    // set the drawing area to be [-1, 1]                                                                                                                                        
    StdDraw.setXscale(-1.0, +1.0);
    StdDraw.setYscale(-1.0, +1.0);

    while(true) {
        // Movement of the ball                                                                                                                                                  
        if (Math.abs(rx + vx) > 1.04) vx = -vx;
        if (Math.abs(ry + vy) > 1.04) vy = -vy;
        rx += vx;
        ry += vy;

        // Movement of the obstacle                                                                                                                                              
        if (Math.abs(x + vox) > 1.0) vox = -vox;
        x += vox;

        /* if (((rx + radius) > (y + height)) || ((rx + radius) < (x - width))){                                                                                                 

            vy = -vy;                                                                                                                                                            
            }*/


        // set background color                                                                                                                                                  
        StdDraw.clear(StdDraw.GRAY);
        // set ball color                                                                                                                                                        
        StdDraw.setPenColor(StdDraw.RED);
        // draw the ball                                                                                                                                                         
        StdDraw.filledCircle(rx, ry, radius);
        // obstacle color                                                                                                                                                        
        StdDraw.setPenColor(StdDraw.BLUE);
        // draw the obstacle                                                                                                                                                     
        StdDraw.filledRectangle(x, y, width, height);
        // pause animation for 5 millisecond                                                                                                                                     
        StdDraw.show(5);
    }
}

}

The part between the /* */ comment is wwhat i tried for detecting collision