Q&A Java Basics

Question 1: When you compile a program written in the Java programming language, the compiler converts the human-readable source file into platform-independent code that a Java Virtual Machine can understand. 

What is this platform-independent code called?

Question 2: Which of the following is not a valid comment:

a. /** comment */ b. /* comment */ c. /* comment d. // comment

Question 3: What is the first thing you should check if you see the following error at runtime:

Exception in thread "main" java.lang.NoClassDefFoundError:

HelloWorldApp.java.

Question 4: What is the correct signature of the main method?

Question 5: When declaring the main method, which modifier must come first, public or static?

Question 6: What parameters does the main method define? 

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Answer 1: Bytecode.

Answer 2: c is an invalid comment.

Answer 3: Check your classpath. Your class cannot be found.

Answer 4: The correct signature is public static void main(String[] args) or public static void main(String... args)

 

Answer 5: They can be in either order, but the convention is public static. 

Answer 6: The main method defines a single parameter, usually named args, whose type is an array of String objects.