Java Flashcards 2

Front

Which of the following is NOT a Java access modifier? public, private, internal, protected

Back

internal

Front

What is the default value of a boolean variable in Java if it’s an instance variable?

Back

false

Front

Which keyword is used to prevent a class from being inherited?

Back

final

Front

What is the size of a Java char?

Back

2 bytes

Front

Which of these exceptions is unchecked in Java? IOException, SQLException, NullPointerException, FileNotFoundException

Back

NullPointerException

Front

Which collection class maintains insertion order in Java?

Back

LinkedHashMap

Front

What will happen if you try to inherit from a final class?

Back

Compile-time error

Front

Which package contains the Collection interface?

Back

java.util

Front

What is the output of System.out.println(9/2); in Java?

Back

4

Front

What is the output of:
System.out.println("Java" + 10 + 20);

Back

Java1020