Exercise: Write a program that implements ArrayList
(1)[America] (2)[Canada, America] (3)[Canada, America, Russia] (4)[Canada, America, Russia, France] (5)[Canada, America, Germany, Russia, France] (6)[Canada, America, Germany, Russia, France, India] (7)[America, Germany, Russia, France, India] (8)[America, Germany, France, India] (9)[America, Germany, France]
Download Code: ArrayList Implementation
Exercise: Write a program that count the occurrences of words in a String.
and : 1 day : 1 fun : 1 good : 1 great : 1 have : 2 keep : 1 learning : 1 morning : 1
Download Code: Count Words
Eight Queens problem is to find a solution o place a queen in each row on a chess board such that no two queens attach each other
Exercise: Use recursion to write a program that finds a solution to Eight Queens problem.
Download Code: Eight Queens
Sierpinski triangle is created as follows:
Exercise: Use recursion to write a program that creates Sierpinski triangles of the order which is input by the user.
Download Code: Sierpinski Triangle
Towers of Hanoi is a classic recursion problem. The problem involves moving a specified number of disks of distinct sizes from one tower to another while observing the following rules.
The objectve of the problem is to move all the disks from A to B with the assistance of C.
Exercise: Use recursion to write a program that will take user input for number of disks and solve the problem for that number of disks.
Enter the number of disks:3 The moves are: Move disk 1 from A to B Move disk 2 from A to C Move disk 1 from B to C Move disk 3 from A to B Move disk 1 from C to A Move disk 2 from C to B Move disk 1 from A to B
Download Code: Towers of Hanoi
Exercise: Use recursion to write a program that will determine the size of a given directory.
Enter a file or directory: C:\Users\Maya\Favorites 17711 bytes. Enter a file or directory: C:\Users\Maya\Desktop\aneesh\Java Exercises\Bouncing Ball.png 26651 bytes. Enter a file or directory: C:\Users\Maya\Desktop\aneesh\Java Exercises\No File.txt 0 bytes.
Download Code: Directory Size
Exercise: Write a program that uses selection sort with recursion to sort a list.
Before sort: 2.0 5.0 3.0 1.2 9.8 3.0 After sort: 1.2 2.0 3.0 3.0 5.0 9.8
Download Code: Recursive Selection Sort
Exercise: Write a program that determines whether a String is a Palindrome. Use recursion.
Is moon a Palindrome: false Is noon a Palindrome: true
Download Code: Palindrome Using Recursion
Exercise: Write a program that asks user input for a positive integer and then print the Fibonacci number for that index. Use recursion.
Enter the Fibonacci Index: 7 Fibonacci at index 7 is 13
Download Code: Fibonacci Using Recursion
Exercise: Write a program that asks user input for a positive integer and then print the factorial of the input. The program should use recursion to determine factorial.
Enter a non-negative number 10 Factorial of 10 is 3628800
Download Code: Factorial Using Recursion
RandomAccessFile class allows a file to be read from or written to at random locations. Constructor takes String arguments "r"/"rw" for read only/read-write access to file. The method seek(int) can be used to place the pointer where the read and write can be done.
Exercise: Write a program that demonstrates RandomAccessFile
Current file length is 800 First number is 0 Second number is 1 Tenth number is 9 Modifying the eleventh number to 555 Current file length is 800 Eleventh number is 555
Download Code: Random Access File
ObjectInput/OutputStreams can be used to read and write objects. These are filter streams that can completely replace data stream because it has all the functions available in the data streams like reading and writing integer, double, UTF etc. Apart from those, this also has functionality to read and write objects.
However, please note that only Serializable objects (Classes or super classes of which implements Serializable interface) can be read or written to file.
Exercise: Write a program that uses object streams to read and write objects.
John 85.5 Sat Dec 22 13:56:00 IST 2012
Download Code: Object Stream Demo
BufferedInput/OutputStreams help performance by reducing the read and write from/to files. These are filter streams that read to or write from a byte array instead of doing it one by one.
Exercise: Write a program that uses buffered streams to copy a file to a target file.
The file ButtonDemo.java has 1578 bytes. Copy Done!
Download Code: Copy
Data streams are actually wrappers on existing input and output streams. They are inherited from the filter streams, which in facts are the wrappers. Ordinary input/output streams can work only with bytes. Filter streams gives the capability to work with integers, doubles, strings etc.
Exercise: Write a program that writes and reads from a binary file using data filter streams.
John 85.5 Jim 185.5 George 105.5
Download Code: Data Stream
FileInputStream/FileOutputStream is for reading and writing bytes from/to files. All the methods are inherited from InputStream and OutputStream respectively.
Exercise: Write a program that writes and reads from a binary file using input output streams
0 1 2 3 4 5 6 7 8 9
Download Code: File Stream
Exercise: Write a program that creates an applet which will show the national flag of a selected country and play its national anthem. The applet will automatically display the next country and play its national anthem once the previous national anthem audio clip is completely played.
Download Code: National Flats & National Anthems
Exercise: Write a program that creates an applet that has a bouncing ball. You can suspend/resume the ball using the buttons and also change the speed of the ball using the scroll bar.
Download Code: Bouncing Ball Applet
Exercise: Write a program that creates an applet for playing tic tac toe game between two players.
Download Code: Tic Tac Toe Applet
Exercise: Write a program that creates an applet for computing loan re-payment.
Download Code: Loan Applet
Exercise: Write a program that creates a simple Applet that displays a message. Use AppletViewer to run it as a standalone window.
Download Code: Simple Applet
Exercise: Write a program that has a text area and a button where the user can enter a message in the text area. Clicking the button should open a new window which has a histogram on the count of each letter in the text area message.
Download Code: Histogram
Exercise: Write a program that creates a message in a panel. The message can be moved across the panel using a vertical and a horizontal slider (instead of scroll bar which was used in exercise# 81).
Download Code: Slider Demo
Exercise: Write a program that creates a message in a panel. The message can be moved across the panel using a vertical and a horizontal scroll bar.
Download Code: Scroll Bar Demo
Exercise: Write a program that uses a drop down list from which the user can select one or more countries. The program will then populate the flags of respective countries in the panel.
Download Code: List Demo
Exercise: Write a program that enhances exercise 77 with a combo box from which the country can be selected to display its corresponding flag and flag description.
Download Code: Combo Box Demo
Exercise: Write a program that creates the following GUI which uses a non-editable text area.
Download Code: Text Area Demo
Exercise: Write a program on top of Exercise 75, where a text field is used to create the displayed message.
Download Code: Text Field Demo
Exercise: Write a program on top of Exercise 74, where radio buttons are used to give color to the message.
Download Code: Radio Button Demo
Exercise: Write a program on top of Exercise 73, where check boxes are added to center, bold and italic the message
Download Code: Check Box Demo
Exercise: Write a program that creates a frame with a message panel and two buttons - Left and Right. Clicking on the buttons make the message to move in the respective directions.
Download Code: Button Demo
Exercise: Write a program that creates a frame with a button with icons. The icon will change when mouse rolls over and when clicked (as in the images below).
Download Code: Button Icons
Exercise: Write a program that creates a live analog clock that ticks every second.
Download Code: Live Clock
The javax.swing.Timer class is a source component that can trigger ActionEvent at a predetermined interval. Listeners to this class needs to implement ActionListener. Listener can be added in the constructor of the Timer class or more listeners can be added using the addActionListener method on the class. Also the delay/interval can be adjusted at a later point of time using the setDelay method. Timer is started using the start() and stopped using the stop methods.
Exercise: Write a program that demonstrates javax.swing.Timer class where a message moves across a panel at an interval of 1 second.
Download Code: Moving Message with Timer
