<commit_before># Checkpoint Answers Chapter 10 #
## 10.1 ##
A subclass is usually not a subset of a superclass. Subclasses will usually add functionality and details that are not present in the superclass thus extending the superclass.  <commit_msg>Solution for check point 10.2.<commit_after># Checkpoint Answers Chapter 10 #
## 10.1 ##
A subclass is usually not a subset of a superclass. Subclasses will usually add functionality and details that are not present in the superclass thus extending the superclass.  

## 10.2 ##
The keyword extends is used when defining a subclass.  

For example:  
```Java  
public class MountainBike extends Bicycle {
	
	// ...
	// ...
	// ...

}
```  
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