Incremental Java
Writing the Class Definition

Putting It All Together

We're now ready to write the entire class definition. This goes into Rectangle.java. This is how it looks: 
public class Rectangle 
{  // beginning of class definition

  // Instance variables
  private int width = 0, height = 0 ;

  // Default Constructor
  public Rectangle()
  {
  }

  // Constructor
  public Rectangle( int initWidth, int initHeight )
  {
     width = initWidth ;
     height = initHeight ;
  }

  // --------------
  // Public Methods
  // --------------
  public void setWidth( int newWidth )
  {
     width = newWidth ;
  }

  public void setHeight( int newHeight )
  {
     height = newHeight ;
  }

  public int getWidth()
  {
     return width ;
  }

  public int getHeight()
  {
     return height ;
  }

  public int getPerimeter()
  {
     return 2 * ( height + width ) ;
  }

  public int getArea()
  {
     return width * height ;
  }

  public boolean isSquare()
  {
     return width == height ;
  }
} // end of class definition