How do I create 2 classes that represent a rectangle

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Eclipse

i need to create a abstract shape class that has methods of setting and getting the width of the object. then i need to write a rectangle class that extends the shape class with methods of setting and getting the length as well as calculating and printing the area (width x length). im not sure on how to start this please help

What I have tried:

public class Shape {

   private double width = 100;
   private double height = 500;

    public Shape(int w, int h) {
        this.width = 5;
        this.setHeight(2);
    } 
    public Shape(double w, double h) {
    width = w;
    height = h;
    }
    public void setWidth(double width){
    	   this.width = width;
    	}

    	public double getWidth(){
    	   return width;
    	}
		public double getHeight() {
			return height;
		}
	public void setHeight(double height) {
			this.height = height;}
}