JavaCore

What is JVM?

• Is an abstract machine. It is a specification that provides runtime environment in which java bytecode can be executed.

• Is a development tool for developer.

• Is a set of libraries for developer.

In the java file, we must use the documentation comment /**... */ (Java doc) to post information for the?

• Class

• Method

• Fields

• All mentioned above

public interface A { public void showA(); }

• public class B extends A { public void showA(){} }

• public class B implements A { public abstract void showA(){} }

• public class B implements A { void showA(){} }

• public class B implements A { public void showA(){} }

Which is a valid declaration within an Interface?

• public static short STOP = 50;

• protected short STOP = 50;

• transient short STOP = 50;

• final void start(short stop);

Types of Java Comments include:

• Single Line Comment

• Multi Line Comment

• Documentation Comment

• A and B are TRUE

• E. A, B and C are TRUE

public interface Foo {

int k = 4; /* Line 3 */

}

Which three piece of codes are equivalent to line 3?

1. final int k = 4;

2. public int k = 4;

3. static int k = 4;

4. abstract int k = 4;

5. volatile int k = 4;

6. protected int k = 4;

• 2, 3 and 4

• 3, 4 and 5

• 4, 5 and 6

• 1, 2 and 3

Which one of the following option make data in an OOP language safe from external modification?

• protected

• public

• private

• default

• None of above

What is JDK stands for?

• Java Development Kit

• Java Development Kat

• Java Developer Kit

• Java Developer Kat

• Java Deployment Kit

Which component is used to compile, debug and execute java program?

• JVM

• JDK

• JIT

• JRE

• None of above

Which component is responsible for converting bytecode into machine specific code?

• JVM

• JDK

• JIT

• JRE

• None of above