public class Rectangle {
  int width, height;
  
  public Rectangle(int width, int height) {
    if( width <= 0 || height <= 0)
      throw new IllegalArgumentException();
    this.width = width;
    this.height = height;
  }
  
  public int getWidth() {
    return width;
  }
  
  public int getHeight() {
    return height;
  }
  
  @Override
  public String toString() {
    return "width: "+width+", height: "+height;
  }
}