Interview Jeopardy Questions.md

Interview Questions

General Knowledge

• Can Java run on Windows? On mobile devices? On IoT Devices?
• Is Java related to JavaScript? What are some ways they are similar or different

Vocabulary

• What is an effectively final variable? Why is it significant?
• How are Overriding and Overloading different? Can variables be overloaded? Can something be both overridden and overloaded?
• What modifiers can be applied to local variables?
• What does abstract mean when applied to a method? To a class?
• What is the difference between an instance variable, a class variable, and a local variable?
• Are primitives in java passed by reference, value, or both?
• What does the instanceof keyword do?
• What is the difference between extends and implements
• What is the difference between throws and throw
• What does the keyword final mean on a variable? A class? A method?
• What is static?
• What is a synthetic function?
• What is javadoc?
• What is aliasing? How does it work? Can you alias primitive types? Reference types?
• What are the primitive types available in Java?
• What is the difference between short and long?

Domain Knowledge

• What is the difference between an abstract class and an interface?
• What is an enum? Is an enum a class? How does it differ from other types of objects?
• What is polymorphism? Is there a keyword to enable or disable polymorphism?
• Do all methods that throw an exception have to declare that exception? Why or why not?
• What is the difference between an Error and an Exception
• Does a for loop have to have a code block after it?
• What is the difference between a basic for statement and an enhanced for statement (aka: for each loop)?
• In a for each loop on an ArrayList, what happens if you remove an element from the list?
• What happens if you pass an object to System.out.println()? How can you change that behavior?
• What is an inner class? Can inner classes have inner classes? How is a static inner class different from a non-static inner class?
• What is an anonymous class? How do you create anonymous classes?

Code Analysis

• Will this compile? What does it do?

class Demo{
void foo(){
if(aBoolean)
	System.out.println("aBoolean was True");
	aBoolean = false;
else
	System.out.println("aBoolean is False");
}
}

• What does this code do?

int bar(int n){
	if( n == 1 || n == -1) return n;
	return bar( --n * -1 )

• What is the difference between these two functions?

String strMaker1(String inStr){
  	return inStr.length() == 1 	? inStr 
								: strMaker1(inStr.substring(1,inStr.length())) + inStr.charAt(0);
}

String strMaker2(String inStr){
	return inStr.length() == 1 	? inStr 
								: inStr.charAt(0) + strMaker2(inStr.substring(1,inStr.length()));
}