Introducing java for a beginner

JAVA PROGRAMMING CS407

CHAPTER-1

INTRO TO JAVA

1. Write a java program to implement types of variables in java programming

THEORY:

VARIABLE is nothing but a container or name given to a particular memory location.
Variable declaration is very simple. Simply use the data type name and variable name. If you
want to initialize the values then use “=” and assign the values. In java we are having 3 types of
variables

1. Local variable: the variables whose scope is within a method/at particular spot

2. Instance variable: the variables which are executed under a class using objects

3. Static variable: the variables whose scope is throughout the program and there is no need of
object to initialize it

PROGRAM:

class variable

{

public static int num1=123;

public static int num2=62; //static variable

int x,y; //instance variable

void method()

{

int a=46;

int b=45; //local variables

int c=a-b;

System.out.println("local:"+c);

}

int show(int x,int y)


PAGE NAME: G. Sharanya
NO: PIN:23001-CS-061

, JAVA PROGRAMMING CS407

{

return(x+y);

}

int display(int num1,int num2)

{

return(num1-num2);

}

public static void main(String ar[])

{

variable obj=new variable();

obj.method();

System.out.println("instance:"+obj.show(61,22));

System.out.println("static:"+obj.display(num1,num2));

System.out.println("DONE BY SHARANYA");

System.out.println("PIN:23001-CS-061");

}

} //END OF THE PROGRAM

OUTPUT:




PAGE NAME: G. Sharanya
NO: PIN:23001-CS-061

, JAVA PROGRAMMING CS407

2. Write a java program to implement types of data types available in java

THEORY:

“DATA TYPES” are the things which will specify how a variable will is initialized that is how much
storage it takes and what type of data it holds. In java we are having 2 types of data types

1. Primitive data types
2. Non-primitive data types

PRIMITIVE DATA TYPES:

 Integer:
1. Byte : byte stores or allows you to store value between range of -128 to 127
2. Short : short allows you to store values between -32,768 to 32,767
3. Int : int allows you to store values between -2,147,483,648 to 2,147,483,647
4. Long : it is used to store a very large number
 Float:
1. Float: it stores a values with precision that means it used represent decimal numbers
with 8bit precision
2. Double: it stores a values with higher precision that is 16 bits
 Char: it is used to store a character
 String: it is the unique data type in java, which will allow you to store a collection of
characters
 Boolean:it is has only two states 1.ture(1) 2.false (0)

Syntax: datatype variable_name=values;

PROGRAM:

class datatypes

{

public static void main(String ar[])

{

String a="SHARANYA";

String fn="Ganesh";

String fm="rani";

byte pin=061;

int marks=999;


PAGE NAME: G. Sharanya
NO: PIN:23001-CS-061

, JAVA PROGRAMMING CS407

short age=16;

long dadsalary=100000000;

float percentage=99.9f;

double cgpa=99999999.999009;

boolean girl=true;

char yesno='s';

System.out.println("student name:"+a);

System.out.println("student father name:"+fn);

System.out.println("student mother name:"+fm);

System.out.println("student pin:"+pin);

System.out.println("student marks:"+marks);

System.out.println("student percentage:"+percentage);

System.out.println("student cgpa:"+cgpa);

System.out.println("student age:"+age);

System.out.println("student parents salary:"+dadsalary);

System.out.println("student is a good mannered person?"+girl);

System.out.println("student is qualified?"+yesno);

}

}




PAGE NAME: G. Sharanya
NO: PIN:23001-CS-061