Question

6. Why do you need to declare the data type of a variable before you can use it in Java? Give two (2) reasons

7. Is the World Wide Web and the Internet just two names for the same entity? Explain.

8. Why was it necessary to use the import statement when we used Scanner and Random?

9. Communication was a problem at Target. What would you recommend as an escalation process if someone encounters a threat and wants it to be known to upper management?

10. TCP is extremely reliable in delivering messages. Explain how this reliability is built into the message distribution process. Optional

11. The Operating System of a computer is the glue that bridges the hardware and software of a computer to make it work. Explain three (3) ways (features) the operating system provides to accomplishes that

. 12. Name the three (3) programming constructs we coded in class using Java along with a description of each one.

Answer 1

PLEASE FIND THE ANSWER(S) and EXPLANATION BELOW.

1. Why do you need to declare the data type of a variable before you can use in java?
   • We have to declare the variables as:
     • datatype variable_name=value;
   • Example:
     • int num=10;
   • Here the use of mentioning the data type is:
     1. At the compile time itself, find out any type errors.
     2. Since, java is a statically typed language, data types are necessary.
2. Is the World Wide Web and the Internet just two names for the same entity?
   • NO
     • World Wide web is a collection of information which can be accessed using internet.
     • Internet is a global NETWORK of NETWORKS !!
     • They are not the same.
3. Why was it necessary to use the import statement when we used Scanner and Random?
   • Because the compiler has to know what is Scanner and Random are !
   • If we use System class, the java compiler already knew that it is from java.lang package, which is already imported by default.
   • But Random and Scanner classes are defined in java.util package.
   • We have to explicitly import them using:
     • import java.util.Random;
     • import java.util.Scanner;
4. We can approach the managers that has some power and has contributed well to the company for the escalation process if someone encounters a threat and wants it to be known to upper management.
5. TCP is extremely reliable in delivering messages. Explain how this reliability is built into the message distribution process. ?
   • TCP is a reliable protocol because it delivers the segments of the packet with a sequence number.
   • It will make sure that every data segment has reached perfectly or not.
   • So, TCP also uses the acknowledgement message to be returned after the data is transmitted.
6. Three (3) ways (features) the operating system :
   1. Memory Management
   2. Input-Output Management
   3. Multi Processor
7. The following are the programming constructs used in Java:
   1. Memory Management ===> Garbage Collection
   2. Input-Output Management ===> Java.io package
   3. Multi Processor ===> Threading concepts in Java.