These are weird specifications. Why would a Rectangle class have a "getCircumference" method? Rectangles have perimeters, not circumference. Your Rectangle class is off to a good start. It looks like you defined the constructor (that public Rectangle(in width, int height) method, but the body of that method isn't correct. A constructor is a special function that is automatically invoked when you create an object. I think the code you've written will just create an endless loop (if you fix those misspellings of Rectangle).
The code inside there should be written outside the class, inside your main function. You also need to use dot notation to access a class's method or variable. Such as x.getCircumference();