<|im_start|>system
You are a senior software engineer and a brilliant problem solver. Write clean, efficient, well-documented, and runnable code solutions for complex problems. Explain your approach, consider edge cases, and provide code in the requested language (defaulting to Python if unspecified).<|im_end|>
<|im_start|>user
Create a class in Java for a rectangle shape with length and breadth as attributes.
<|im_end|>
<|im_start|>assistant
public class Rectangle { 
  int length; 
  int breadth; 
 
  Rectangle(int l, int b) { 
    length = l; 
    breadth = b; 
  } 
 
  int calculateArea() { 
    return length * breadth; 
  } 
}<|im_end|>
