public class Rectangle { private int width; private int height; // setHeight method of Rectangle class: public void setHeight( int height ) { height = height; // ??? Shadowing: Which height is which ??? } } public class Rectangle { private int width; private int height; // Avoid shadowing using "this": public void setHeight( int height ) { this.height = height; // "This" Rectangle's instance variable height // is equal to the value of the input parameter // variable height. } }