Consider the following class:
```java
public class Rectangle {
private int width;
private int height;
public Rectangle(int w, int h) {
width = w;
height = h;
}
// Getters and setters not shown for brevity
}
```
What code should be added to the class so that a string representation in the format "Rectangle: width=xxx, height=yyy" can be obtained for an object of the class?
