Chapter I

Question 1

What are the key (identifying) benefits of Java

Answer 1

• Object-Oriented
• Encapsulation
• Platform independent
• Robust
• Simple
• Secure
• Multithreaded
• Backward Compatibility

Question 2

An Object is a runtime instance of a class in memory

Answer 2

Yes

Question 3

A reference is

Answer 3

A variable that points to an object

Question 4

Methods and fields are

Answer 4

Called the members of the class

Question 5

The method name and parameter types are called

Answer 5

The method signature

Question 6

Main method signature

Answer 6

public static void main (String[] args){}
public static void main (String… args){}
public static void main (String options[]){}

Question 7

Each file can contain how many public class

Answer 7

Only one public class

Question 8

public, private are

Answer 8

Access modifier

Question 9

varargs is

Answer 9

variable argument lists

Question 10

Compile command

Answer 10

javac -d classes packagea/ClassA.java packageb/ClassB.java

Question 11

Run command

Answer 11

java -cp classes packageb.ClassB
java -classpath classes packageb.ClassB
java –class-path classes packageb.ClassB

Question 12

Create a jar command

Answer 12

jar -cvf myNewFile.jar .
jar –create –verbose –file myNewFile.jar .
jar -cvf myNewFile.jar -C dir .