Java 101 Intro to Java Programming - Exercises

Apr 9, 2015Download as pptx, pdf

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This document outlines several hands-on exercises for learning Java fundamentals. It describes exercises to create basic Java programs, programs that take command line arguments, programs for integer operations, finding leap years, and printing powers of two. It also includes bonus exercises for random number generation, arrays of days, printing personal details, and calculating sales discounts.

Hands-on Exercises
Java 101: Introduction to Java

Create Basic Java Program
• Create the following program by typing it into
a text editor, and save it as HelloWorld.java.

Compile Basic Java Program
• Compile it by typing at the command-line: javac
HelloWorld.java.
• This creates a Java bytecode file named:
HelloWorld.class.

Execute Basic Java Program
• Execute it by typing at the command-line: java
HelloWorld.

Hands on Exercise
Command Line Arguments

Command Line Arguments
• Create a program that takes a name as command-line argument and
prints “Hi <name>, How are you?”

Exercise: Integer Operations
• Create new Java project in Eclipse called IntegerOperations
• Create a Java class named IntOps that performs integer operations on a pair of integers
from the command line and prints the results.

Exercise: Leap Year Finder
• A year is a leap year if it is either divisible by 400 or
divisible by 4 but not 100.
• Create a java project in Eclipse named LeapYearFinder
• Write a java class named LeapYear that takes a year as
command line argument and prints true if it’s a leap
year and false if not

Exercise: Powers of Two
• Create a new Java project in Eclipse named Pow2
• Write a java class named PowerOfTwo to print powers of 2 that are
<= 2N where N is a number passed as an argument to the program.
– Increment i from 0 to N.
– Double v each time

Bonus Exercises
Java 101: Introduction to Java

Hands-on Exercise
Random Number Generator

Exercise: Random Number Generator
• Create a new java project in Eclipse called RandomInteger
• Write a java class named RandomInt to generate a pseudo-random
number between 0 and N-1 where N is a number passed as an
argument to the program

Exercise: Array of Days
• Create a new Java project in Eclipse named ArrayOfDays
• Create a java class named DayPrinter that prints out
names of the days in a week from an array using a for-
loop.

Solution: Arrays of Days
public class DayPrinter {
public static void main(String[] args) {
//initialize the array with the names of days of the
week
String[] daysOfTheWeek =
{"Sunday","Monday","Tuesday","Wednesday",
"Thuesday","Friday”,"Saturday"};
//loop through the array and print their elements to
//stdout
for (int i= 0;i < daysOfTheWeek.length;i++ ){
System.out.println(daysOfTheWeek[i]);
}
}
}
% javac DayPrinter.java
% java DayPrinter
Sunday
Monday
Tuesday
Wednesday
Thuesday
Friday
Saturday

Hands-on Exercise
Print Personal Details

Exercise: Print Personal Details
• Write a program that will print your name and
address in the Console view of Eclipse, for
example:
Alex Johnson
23 Main Street
New York, NY 10001 USA

Exercise: Sales Discount
• Create a new project in Eclipse named Sale
• Create, compile, and run the FriendsAndFamily class as illustrated below
• Debug this program in your IDE to find out how it works

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Java 101 Intro to Java Programming - Exercises

1. Hands-on Exercises Java 101: Introduction to Java

2. Hands-on Exercise Basic Java Program

3. Create Basic Java Program • Create the following program by typing it into a text editor, and save it as HelloWorld.java.

4. Compile Basic Java Program • Compile it by typing at the command-line: javac HelloWorld.java. • This creates a Java bytecode file named: HelloWorld.class.

5. Execute Basic Java Program • Execute it by typing at the command-line: java HelloWorld.

6. Hands on Exercise Command Line Arguments

7. Command Line Arguments • Create a program that takes a name as command-line argument and prints “Hi <name>, How are you?”

8. Hands-on Exercise Integer Operations

9. Exercise: Integer Operations • Create new Java project in Eclipse called IntegerOperations • Create a Java class named IntOps that performs integer operations on a pair of integers from the command line and prints the results.

10. Solution: Integer Operations

11. Hands-on Exercise Leap Year Finder

12. Exercise: Leap Year Finder • A year is a leap year if it is either divisible by 400 or divisible by 4 but not 100. • Create a java project in Eclipse named LeapYearFinder • Write a java class named LeapYear that takes a year as command line argument and prints true if it’s a leap year and false if not

13. Solution: Leap Year Finder

14. Hands-on Exercise Powers of Two

15. Exercise: Powers of Two • Create a new Java project in Eclipse named Pow2 • Write a java class named PowerOfTwo to print powers of 2 that are <= 2N where N is a number passed as an argument to the program. – Increment i from 0 to N. – Double v each time

16. Solution: Power of 2

17. Bonus Exercises Java 101: Introduction to Java

18. Hands-on Exercise Random Number Generator

19. Exercise: Random Number Generator • Create a new java project in Eclipse called RandomInteger • Write a java class named RandomInt to generate a pseudo-random number between 0 and N-1 where N is a number passed as an argument to the program

20. Solution: Random Number Generator

21. Hands-on Exercise Array of Days

22. Exercise: Array of Days • Create a new Java project in Eclipse named ArrayOfDays • Create a java class named DayPrinter that prints out names of the days in a week from an array using a for- loop.

23. Solution: Arrays of Days public class DayPrinter { public static void main(String[] args) { //initialize the array with the names of days of the week String[] daysOfTheWeek = {"Sunday","Monday","Tuesday","Wednesday", "Thuesday","Friday”,"Saturday"}; //loop through the array and print their elements to //stdout for (int i= 0;i < daysOfTheWeek.length;i++ ){ System.out.println(daysOfTheWeek[i]); } } } % javac DayPrinter.java % java DayPrinter Sunday Monday Tuesday Wednesday Thuesday Friday Saturday

24. Hands-on Exercise Print Personal Details

25. Exercise: Print Personal Details • Write a program that will print your name and address in the Console view of Eclipse, for example: Alex Johnson 23 Main Street New York, NY 10001 USA

26. Hands-on Exercise Sales Discount

27. Exercise: Sales Discount • Create a new project in Eclipse named Sale • Create, compile, and run the FriendsAndFamily class as illustrated below • Debug this program in your IDE to find out how it works

Java 101 Intro to Java Programming - Exercises

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