1. Java Tutotrial for [NLP-AI] 2
4 December 2018

2. Last Assignment ? Print the details in tabular format - use tabs \t
asgn1
asgn2
Last Assignment
? Print the details in tabular format
- use tabs \t
System.out.println("\"Can we print '\\' with System.out.println() statement?\"" );
4 December 2018
Java Tutorial series part 2

3. Java Tutorial series part 2
Storing data
In Java, Data can be stored as
Numbers
2, 6.67, 0.009
Characters
‘c’, ‘p’, ‘?’, ‘2’
Strings
“data”, “Hindi language”, “$99”, “
4 December 2018
Java Tutorial series part 2

4. Java Tutorial series part 2
Program
int1
int2
// this program will declare and print a number
class int2 {
public static void main(String[] arguments)
int weight = 68;
System.out.println("your weight is " + weight); }
//end of program
4 December 2018
Java Tutorial series part 2

5. Comments(double slash)
Not executed
For documentation
Can be placed on any line
Anything written after // is not executed
E.g.
// this is a comment
Used to explain/describe what is done in the program
Good practice
4 December 2018
Java Tutorial series part 2

6. Java Tutorial series part 2
Types of numbers
float1
int
Whole numbers like 0, 575, -345 etc.
double
Numbers with decimal point
like , 3.432,
4 December 2018
Java Tutorial series part 2

7. Java Tutorial series part 2
Variable declaration
Before using any name, it must be declared
(with its type i.e int or double).
Needed only once in one program
Generally, done initially
Syntax
datatype name;
double total; // stores the total value
int index;
int a,b , c, sum, interest;
4 December 2018
Java Tutorial series part 2

8. Java Tutorial series part 2
Assignment
int3
int5
int a; //declaration – needed once
a = 10 ; // assignment … declared above
int a = 10; // assignment and declaration together
10 = a ; // not possible – compilation error
Left hand side is always a variable for assignment
Storage area a 10
4 December 2018
Java Tutorial series part 2

9. Java Tutorial series part 2
Assignment…
int4
int a , b ;
a = 4;
b = 7;
a = b;
b = a;
a = 5;
// a =? b = ?
// a = 4 b = ?
// a = 4 b = 7
// a = 7 b = 7
// a = 7 b = 7
// a = 5 b = 7
4 December 2018
Java Tutorial series part 2

10. Java Tutorial series part 2
Character data
char1
char2
Characters
‘a’, ‘A’, ‘c’ , ‘?’ , ‘3’ , ‘ ’
(last is the single space)
Enclosed in single quotes
Character variable declaration
char ch;
Character assignment
ch = ‘k’;
4 December 2018
Java Tutorial series part 2

11. Java Tutorial series part 2
string1
string2
string3
String data
Strings are sequence of characters enclosed in double quotes
Declaration
String name;
String address;
String line;
Assignment
name = “ram”;
line = “this is a line with spaces”;
name = “a”; // single character can be stored
name = “”; // empty string
The sequence of characters enclosed in double quotes, printed in println() are also strings.
E.g. System.out.println( “Welcome ! “ );
4 December 2018
Java Tutorial series part 2

12. Java Tutorial series part 2
Practice problem
Try to print these two figures on the screen using println and least number of strings
*******
*****
*** *
**********
* *
4 December 2018
Java Tutorial series part 2

13. Java Tutorial series part 2
Thank you
4 December 2018
Java Tutorial series part 2