Java programming: Elementary practice

Structure programmingStructure programming
Java Programming – PracticeJava Programming – Practice
part -1part -1
Faculty of Physical and Basic Education
Computer Science
By: Msc. Karwan M. Kareem
www.karwanit.com
karwan@karwanit.com
2016 - 2017
1
© University of Sulaimani, Faculty of Physical & Basic Education, Department of Computer Science 2014 / 2015

Installing JDKInstalling JDK
1- go to JDK folder
2- Right click on JDK icon and click
open
2

3- Waiting for configuring the
installer ..
3

4- click on next button..
4

5- choose the installation folder..
6 – click on next button …
5

7 – click on Install button …
6

8 – Waiting for installing all JDK
files…
7

8 – Installation completed
successfully and click on
finish button to finish the
JDK…
8

1- Click on the Eclipse – Shortcut
or Eclipse -Icon
2- Choose a workspace folder to
use for this session
3- Click ok
Starting to write first Java program ....
9

4- go to file list  new Java project
5- write your project name
10

6- click next button
7- click finish
11

8- go to the project  right click new  class
9- write name for your class
10- choose the modifier “public”
12

11- choose the method
12- click finish
13

13- write your Java Program
14- click on run and get
the result
14

1- Input: Define all variables
1- process
1- Output: print results
Example: Write a Java program to calculate two numbersExample: Write a Java program to calculate two numbers
15

Example: Write a Java program to compute the area of the circle
1- allocate memory for radius
2- allocate memory for area
3- compute
area and
assign it to
variable area
4- print a
message to the
console
16

Write a Java program to compute the area
of the circle ( use JOptionPane)

Example: Write a Java program to print out full name, with use theExample: Write a Java program to print out full name, with use the
scanner classscanner class to handle input from a user.to handle input from a user.
import java.util.Scanner;import java.util.Scanner;
public class FullName {public class FullName {
public static void main(String[] args) {public static void main(String[] args) {
// TODO Auto-generated method stub// TODO Auto-generated method stub
Scanner In = new Scanner (System.Scanner In = new Scanner (System.in);in);
System.System.out.println("enter first name:");out.println("enter first name:");
String first_name = In.next();String first_name = In.next();
System.System.out.println("enter last name");out.println("enter last name");
String last_name=In.next();String last_name=In.next();
System.System.out.println("Your full name is: " + first_name +" "+ last_name);out.println("Your full name is: " + first_name +" "+ last_name);
} }} }
Create new Scanner Object
Read first input
Read second input
18

Example: Write a Java program to print out your profile,Example: Write a Java program to print out your profile,
with use thewith use the scanner classscanner class to handle input from a userto handle input from a user
import java.util.Scanner;
public class FullName {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner In = new Scanner (System.in);
System.out.println("enter first name:");
String first_name = In.next();
System.out.println("enter last name ");
String last_name=In.next();
System.out.println("enter your age ");
int age=In.nextInt();
System.out.println("enter your adress ");
String address=In.next();
System.out.println("enter your gender ");
String gender=In.next();
System.out.println("Your full name is: " + first_name + " " + last_name);
System.out.println("Your age is: " + age);
System.out.println("Your address: " + address);
System.out.println("Your gender is: " + gender); } }
Read data from consol
Print all variables
19

Example: Write a program that obtains Current Date &
Time
This is very easy to get current date and time in Java. You
can use a simple Date object with toString() method to
print current date and time as follows:
import java.util.Date;
public class DateDemo {
public static void main(String args[]) {
// Instantiate a Date object
Date date = new Date();
// display time and date using toString()
System.out.println(date.toString());
}
}
Create new Date Object
Using toString to print current date
and time
20

)
94
(9
))(5(10
5
43
y
x
xx
cbayx +
++
++−
−
+
Example: Write a JAVA program to find out the output of theExample: Write a JAVA program to find out the output of the
following rulesfollowing rules
import java.util.Scanner;
public class arth {
public static void main(String[] args) {
Scanner In = new Scanner (System.in);
System.out.println("enter number a ");
int a=In.nextInt();
System.out.println("enter number b ");
int b=In.nextInt();
System.out.println("enter number c ");
int c=In.nextInt();
System.out.println("enter number x ");
int x=In.nextInt();
System.out.println("enter number y ");
int y=In.nextInt();
double outPut = (3 + 4 * x) / 5 - (10 * (y-5)*(a+b+c))/x +9*(4/x+(9+x/y));
System.out.println("the result is :" + outPut); } }
Read data from consol
21

Question 1: Write a Java program to compute the area of the
Trapezium, with use the scanner class to handle input from a
user, and JOptionPane to print the result.
22

Question 2:AQuestion 2:A: Write a Java program to compute the area of the: Write a Java program to compute the area of the
SectorSector,, with use thewith use the scanner classscanner class to handle input from a user,to handle input from a user,
andand JOptionPaneJOptionPane to print the result.to print the result.
23

Question 2:BQuestion 2:B: Write a Java program to compute the area of the: Write a Java program to compute the area of the
top part of the circle,top part of the circle, with use thewith use the JOptionPaneJOptionPane to handle inputto handle input
from a user, andfrom a user, and consoleconsole to print the result.to print the result.
24
1
2
3
4
5
6

25

Question 3Question 3: Write a Java program to compute the area of the: Write a Java program to compute the area of the
EllipseEllipse,, with use thewith use the scanner classscanner class to handle input from a user,to handle input from a user,
andand JOptionPaneJOptionPane to print the result.to print the result.
26

Question 4:A:Question 4:A: Write a JAVA program to find the real valueWrite a JAVA program to find the real value
output of the following rules.output of the following rules.
- UseUse Scanner classScanner class to handle input from a user.to handle input from a user.
- UseUse JOptionPaneJOptionPane to print the result.to print the result.
)
4
(9
))(5(10
5
4
h
L
LL
cbahL
y ++
++−
−=
m
h
k
dk
hk
b +++
−
−=
4)5(11
5
15
27

28
Question 4:B:Question 4:B: Write a JAVA program to find the “real value” output of theWrite a JAVA program to find the “real value” output of the
following rules.following rules. - UseUse Scanner classScanner class to handle input from a user.to handle input from a user.
- UseUse JOptionPaneJOptionPane to print the result.to print the result.
10
10
23
−++=
h
x
L
xx
y

Question 5:Question 5: Write a Java program to print out your profile,Write a Java program to print out your profile,
with use thewith use the scanner classscanner class to handle input from a userto handle input from a user
outputoutput
Name: Karwan M. KareemName: Karwan M. Kareem
Gender: MaleGender: Male
Age: 30Age: 30
Email address: mailExample@yahoo.comEmail address: mailExample@yahoo.com
Address: SulAddress: Sul
Note: any thingNote: any thing
29

Question 6: Write a java program to find theQuestion 6: Write a java program to find the SumSum andand
AverageAverage of five lessons, and print them out with yourof five lessons, and print them out with your
name. is he/ she good or bad student (Use JOptionPane forname. is he/ she good or bad student (Use JOptionPane for
Input)Input)
OUTPUT :OUTPUT :
Your name : Karwan M. KareemYour name : Karwan M. Kareem
Lessons1=55Lessons1=55
The sum = 275The sum = 275
The average = 55The average = 55
He is goodHe is good
30

31

Question 7: Write a Java program to compare three numbersQuestion 7: Write a Java program to compare three numbers
and find largest out of three (Use JOptionPane or Scanner).and find largest out of three (Use JOptionPane or Scanner).
X greater then y and x greater then zX greater then y and x greater then z  "First number is largest""First number is largest"
Y greater then x and y greater then zY greater then x and y greater then z  "Second number is largest""Second number is largest"
zz greater thengreater then xx andand zz greater thengreater then yy  "Third number is largest""Third number is largest"
ElseElse  "Entered numbers are equals...""Entered numbers are equals..."
32

33

Question 8: write the program in Java aboutQuestion 8: write the program in Java about if elseif else the programthe program
should ask the user to enter the total marks out of 100, and thenshould ask the user to enter the total marks out of 100, and then
display the letter grade on the screen (Use Scanner class)display the letter grade on the screen (Use Scanner class)
* Grade Rules:* Grade Rules:
0-490-49  D gradD grad
50-5550-55  C gradC grad
56-6056-60  C+ gradC+ grad
61-7061-70  B gradB grad
71-7571-75  B+ gradB+ grad
76-8576-85  A gradA grad
86-10086-100  A+ gradA+ grad
Else “you have error …”Else “you have error …”
34

35

36

Question 9: Write a java program to implement a Vote System,
with use JOptionPane for input and console for outpt
Name : karwan kareem
address: Sul / Hilan City
gender: Male
age: 30
Age > 0 and age <18
print  “cannot vote”
age > 18 and age < 100
print  “can vote “
else
print “you have error ”
37

38

Question 10: Write a java program about “Good student “
(use JOptionPane)
If gender is male and grade is 70 and above: display “Good boy"
If gender is female and grade is 70 above: display “Good girl"
but if grade is below 70 regardless of gender: display “Bad child"
39

Question 11: write a java program to create “size-system”
(Use JOptionPane).
If size equal to 1  X-small
If size equal to 2  small
If size equal to 3  Medium
If size equal to 4  large
If size equal to 5  X-large
41

42

Question 12: write the output of the following Java codes.
43

Question 13: write the output of the following Java codes.
44

Question 13:B: write the output of the following Java codes.
45

Question 14: write a java program to print out ten numbers between 9 to 21
(Use While-Loop).
46

Question 15: write a java program to print out ten numbers between 9 to 21
(Use For-Loop).
47

Question 16: write a java program to find the square root ofQuestion 16: write a java program to find the square root of
the number between 20 and 40 (Use scanner class)the number between 20 and 40 (Use scanner class)
import static java.lang.Math.*;
double sq = Math.sqrt(25)double sq = Math.sqrt(25)
48

49

Question 17: write a java program to print out odd and even numbers between
1500 to -2000 (Use While-Loop).
1500: Even
1499: Odd
1498: Even
1497: Odd
-1999: Odd
-2000: Even
50

Question 18: write a java program to print out positive and negative numbers
between -300 to 500 (Use While-Loop).
-300: Negative
-299: Negative
-298: Negative
-297: Negative
499: Positive
500: Positive
51

52

Question 19: write a java program to print out sum and average of negative
numbers between 500 to -500 (Use For-Loop).
500
499
498
-499
-500 sum=? And ava=?
53

54

Question 20: Write a java program to find out largest and sum of these
numbers  (0, 1, 2, 3, 4, 5, 6, 8,  100). (Use For-Loop)
55

56

Question 21: Write a java program to print out five random characters
(Use For-Loop)
57

Question 22: Write a java program to print out following star patterns in
console. (Use For-Loop)
58

59

60
23: Write a java program to print out A-Z characters with converting them
to their integer numbers. (Use For-Loop)

61
Q 24: write a java program to print out odd and even numbers between
1.01 to 99.99 (Use For-Loop).
1.01: Even
2.02: Odd
3.03: Even
97.97: Odd
98.98: Odd
99.99: Even

0
10
20
30
40
50
60
70
200
B[0]
B[1]
B[2]
B[3]
B[4]
B[5]
B[6]
B[7]
B[20]
Input output
0
1
2
3
4
5
6
7
20
process
Question 25: write a java program to print out the following arrays.
Sum
210
62

0
10
20
30
40
50
60
70
200
B[0]
B[1]
B[2]
B[3]
B[4]
B[5]
B[6]
B[7]
B[20]
Input output
0
- 10
- 20
- 30
- 40
- 50
- 60
- 70
- 20
process
Question 26:Question 26: write a java program to print out the following arrays.write a java program to print out the following arrays.
Sum
-2100
63

64
H1: write a java program to greet your friend. (Use Scanner)
If time is less than 10:00, create a "Good morning" greeting, if not,
but time is less than 20:00, create a "Good day" greeting, otherwise
a "Good evening":
H2: Write a Java program to print the number entered by user only
if the number entered is negative.
H3: Write a Java program to relate two integers entered by user
using = or > or < sign.
H4: Write a java program to find the sum of first n natural numbers
where n is entered by user. Note: 1,2,3... are called natural
numbers.

65
H5: Write a Java program to find the factorial of a number, where
the number is entered by user. (Hints: factorial of n = 1*2*3*...*n
H6: Write a Java program to add all the numbers entered by a user
until user enters 0. (Use Do – While Loop)
H7: Write a program that asks user an arithmetic
operator('+','-','*' or '/') and two operands and perform the
corresponding calculation on the operands.
H8: Write a program to print following output using for loop.
1
22
333
4444
55555

66
H9: write a java program to print out the sum of odd numbers
between - 3000 to -1000 (Use While-Loop).
-3000
-2990
-2980
…
-1000

67
END…END…
Any questions..?Any questions..?
Hope you have been happyHope you have been happy
Thank youThank you
By: Msc. Karwan M. KareemBy: Msc. Karwan M. Kareem
2014 - 20152014 - 2015

Java programming: Elementary practice

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