Making Box appear in random locations

Processing Coding Questions
#1 
class Box{
  float z = 50;
  float dz = 2;
  
  void moveBox()
  {
    z += dz;
  }
  
  void show()
  {
    lights();
    pushMatrix();
    translate(130, 220, z);

    noStroke();
    fill(10, 98, 240);
    rotateX(frameCount / 100.0);
    rotateY(frameCount / 100.0);
    box(40);
    popMatrix();

    if(z+30 >height || z-30 <0)
    {
      dz *=-1;
    }
  }
 
}
#2
#3

Hello @zack10,

There are resources here:

:)