Object-Oriented Programming

Question

1. Discuss how to create a simple java program

2. What are the requirements before executing a java program?

3. Describe the NetBeans IDE

4. Differentiate Local, instance and static variable.

5. How do we declare variable in java program?

6. What is a Statement? Expression?

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Answer 1

(I)

1) Program created in a text editor or IDE

integrated development environment which

contains the compiler and JVM

2) the program is then compiled either at

the DOS command prompt using the command javac,

or via the menus in the IDE

3) the program can then be run either at

the DOS command prompt using the command java,

or via the menus in the IDE

(II)

java must be installed as well as the IDE if used

(III) NetBeans is a particular type of IDE that

allows the development and creation of various

type of java applications: stand-alone, console apps,

windows apps, web apps, servlets, etc

(IV) local variable is declared INSIDE the function

instance variable is declared via the NEW command

to declare an Instance of an object of some particular class

static variable CANNOT be changed

(V) see the sample program which illustrates the declaration of

variables of different types and kinds

(VI) expression contains variables, numbers, and operators

(VII) statement is an exectuable line of code that ends with

semicolon;

class LyncyM

{

public static void main(String args[])

{

int iIntvar = 12;

long longIntNum = 54321;

float flAmt = 333.33f;

double flDblAmt = 3.1415925;

String str="HELLO";

// this is a one line commnet

/*****************

this is a multi-line comment

*************************************/

/*******************

operators: add +, subtract -, multiply *, divide /,

mod %, increment by 1 ++, decrement by 1 --

comparison operators: equal ==, not equal !=,

greater >, less <,

greater or equal >=,

less or equal <=

**************************/

// expression contains numbers, variables, operators

System.out.println(iIntvar);

System.out.println(longIntNum);

System.out.println(flAmt);

System.out.println(flDblAmt);

System.out.println(str);

}

}