Here is the file Rectangle.java, implementing the Rectangle class:

// Rectangle.java: model a rectangle object
public class Rectangle
{ 
   // data fields for the object
   private double myLength;
   private double myWidth;
   private String myName;

   // constructor initializes fields from input parameters
   public Rectangle(double initialLength, double initialWidth,
                String initialName)
   {
      myLength = initialLength;
      myWidth = initialWidth;
      myName = initialName;
   }

   //accessor methods
   public String toString( )
   {
      return "[name: " + myName + ",  length: " + myLength +
            ", width: " + myWidth + ", area: " + getArea() +
            ", perimeter: " + getPerimeter() + "]";
   }

   public double getArea( )
   {
      return myLength*myWidth;
   }

   public double getLength( )
   {
      return myLength;
   }

   public String getName( )
   {
      return myName;
   }

   public double getPerimeter( )
   {
      return 2*(myLength + myWidth);
   }

   public double getWidth( )
   {
      return myWidth;
   }
}

Here is the file RectangleTest.java, that tests the Rectangle class:

// RectangleTest.java: class with main() to test Rectangle
public class RectangleTest
{
   public static void main (String[] args)
   {
      // Create a 3x5 rectangle called George
      Rectangle aRect = new Rectangle(3, 5, "George");
      System.out.println("aRect: " + aRect);
                
      // Test the get accessor methods of Rectangle 
      System.out.println("The Perimeter of aRect is " +
                     aRect.getPerimeter());
      System.out.println("The Area of aRect: " +
                     aRect.getArea());
      System.out.println("The Length of aRect: " +
                     aRect.getLength());
      System.out.println("The Width of aRect: " +
                     aRect.getLength());
      System.out.println();
      // Create a 5x8 rectangle called Martha
      Rectangle anotherRect = new Rectangle(5, 8, "Martha");
      System.out.println("anotherRect: " + anotherRect);

   }
}

Here is sample program output:

aRect: [name: George,  length: 3.0, width: 5.0, area: 15.0, perimeter: 16.0]
The Perimeter of aRect is 16.0
The Area of aRect: 15.0
The Length of aRect: 3.0
The Width of aRect: 3.0

anotherRect: [name: Martha,  length: 5.0, width: 8.0, area: 40.0, perimeter: 26.0]