public class Robot {  
    public static final int  RADIUS = 5;
    public static final int  TURN_ANGLE = 15;
        
    int     x, y;        // location of the robot at any time
    float   direction;   // direction of the robot at any time
    float   speed;       // the robot’s speed
    Beacon  beacon;      // the beacon to head towards
    
    public Robot(int rx, int ry) {
        x = rx;
        y = ry;
        direction = (float)(Math.random()*Math.PI*2);  // a random direction
        speed = 3 + (float)(Math.random()*4);          // a random speed from 3 to 6
        beacon = null;                                 // not set yet
    }
}