How do I do these?

Butterfly Language/Type: Java classes constructors Critters fields implementing inheritance instance methods Related Links: Critter.java Author: Marty Stepp (on 2010/05/30) ("Critter" classes come from the University of Washington's CSE 142 Critters homework assignment. See the assignment spec for more information.) Define a Critter class named Butterfly with the following behavior: Language/Type: Java classes constructors Critters fields inheritance instance methods Related Links: Critter.java Author: Jason Ganzhorn ("Critter" classes come from the University of Washington's CSE 142 Critters homework assignment. See the assignment spec for more information.) Write a class Shark that extends the Critter class from the Critters assignment. Shark objects should alternate between moving to the north and south as follows: first move 1 step north, then 2 steps south, then 3 steps north, then 4 steps south, then 5 steps north, then 6 steps south, and so on, each time moving one farther than previously. You may add anything needed (fields, other methods, constructors, etc.) to implement this behavior appropriately. Type your solution here: 12} This is an inheritance problem. Write a Java class using inheritance. (You do not need to write any import statements.) E Indent Sound F/X Highlighting Your code did not compile. Please read and correct the errors below. - Error emitted from internal testing code. This error is occurring when our internal testing code is trying to call your code. If you see this, it may mean that you have the wrong header for your solution, or a mismatched \{\}() brace. You are referring to a name that is not recognized. Perhaps you misspelled it, mis-capitalized it, or forgot to declare it? Language/Type: Related Links: Critter.java Author: Marty Stepp (on 2010/05/30) ("Critter" classes come from the University of Washington's CSE 142 Critters homework assignment. See the assignment spec for more information.)