Chapter 2

Question 1

Which thing make JAVA portable

Answer 1

JVM

Question 2

What is JAVA byte code

Answer 2

Java code convert into JAVA byte code which JVM understands.

Question 3

Is JAVA platform independent

Answer 3

Yes

Question 4

What is the difference between JAVA and C++

Answer 4

Java has destructors (garbage collection). Java do not have pointers. Java have no templates. Java have no header files. Java is OOP

Question 5

Please list down JAVA front and web development technologies

Answer 5

• Servlets
• JSP
• JSF
• Applets

Question 6

What are business components for JAVA

Answer 6

EJBs

Question 7

What is used for database in Java

Answer 7

JDBC

Question 8

In Java, some time it happens that business, database and user objects are reside on different machines. How to link them.

Answer 8

using RMI (Remote Method invocation)

Question 9

What is JVM verifier

Answer 9

It make sure robustness, security and safety on java code

Question 10

What software required for java to run on machine

Answer 10

JDK (java development kit)

Question 11

Is there any global functions or global variables in Java

Answer 11

No

Question 12

How to compile java program

Answer 12

javac filename.java

It converts code into byte code

Question 13

How to run the compiled file

Answer 13

java filename

Question 14

Who creates byte code

Answer 14

compiler

Question 15

Who puts byte code into memory

Answer 15

class loader

Question 16

Who read byte code

Answer 16

interpreter

Question 17

What is the naming convention for Java

Answer 17

class = MyClass
method = myMethod()
variable = myVariable
constant = MY_CONSTANT

Question 18

How much public class are allowed in a source file

Answer 18

1