Practice Java questions

• I want to implement a class named MyClass. What shall I name the file?
• What line do I type to compile the code on a unix-based machine?
• What line do I type to run the code on a unix-based machine?

Consider the following code:
A.java
B.java

• What type of function is public A(int x)?
• What type of function is public int getNumber()?
• What is the output from running main in A?
• I would like to be able to print out like this:
  System.out.println("A: "+a+"\n");
  Implement the function that will allow this.

Now imagine that I have a class that extends A. SubA.java

• In order to allow SubA to directly access instance variable number, what keyword do I need to use?
• What does the line super(x) do?
• What happens if there isn't a call to super?
• What is the output of running main in SubA?