2. Write a program to convert 69F into its equivalent centigrade temperature.

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1 Java lab Assignment (By Mr. Sachin Patil SinceTechnologies.com, 1. Print a triangular multiplication table as shown below: Write a program to convert 69F into its equivalent centigrade temperature. 3. Write a program to calculate the sum of odd integers between 1 and 99 using for loop. 4. Write a program to get following output: ***** #### # ***** #### # ***** 5. Write a program that will accept command line arguments and print the same 6. Write a program that has a method for calculation of fourth power of 2 7. Write a program that has a method for initialization of variables of 10 and 20 and another method which will display the same. 8. Write a program that will print details about current date, time, month, year, day of month, day of week. 9. Write a program that will display the message Weight of Bundle 5kgs in a constructor and display weight in kilograms and grams.

2 10. Write a program to: a. Test equality between 2 strings b. Concatenate The appendage will come after me to one of strings c. Find the length of strings d. Replace the I s in the string with z s e. Convert one of strings to upper case. 11. Write a program that has overloaded methods. The 1 st method should accept no argument, 2 nd method will accept one string and 3 rd method will accept a string and integer. 1 st method should display message Rose is a beautiful flower twice. 2 nd method should display message Sunflower is a beautiful flower twice. 3 rd method should display message Marigold is a beautiful flower four times. 12. Write a program to sort the elements of an array in ascending order. 13. Create a class called Numeral that accepts an array of ten numbers. Create a sub class called Numplay which has menu as follows: a. Display number entered b. Sum of numbers c. Average of numbers d. Maximum of numbers e. Minimum of numbers 14. Create a base called Shape. It should contain two methods getcoord() and showcoord() to accept x and y co-ordinates and to display same. Create a sub class Rect. It should also contain to display length and breadth of rectangle called showcoord(). In the main method, execute the showcoord() method of Rect class by applying the dynamic method dispatch concept. 15. Create a class called car. Initialize the colour and body to blue and wagon. There should be two constructors. One is default constructor that creates a blue wagon. The other constructor should take two arguments (colour and body). Write a method tostring that returns the colour and body.

3 Create a subclass funcar. In the subclass also there are two constructors. Call the base class constructors from these two constructors. Write another method playcd in the subclass that display the message Beautiful music files the passenger department. Execute the methods to display the following: My car is blue wagon. My father s car is a red convertible. 16. Create an integer array to contain ten numbers. Using RandomAccessFile, write the array into a file called abc.txt. The program should read the contents of the abc.txt file backwards. Make use of try / catch and finally clauses. 17. Create a user-defined exception class using the extends keyword. Write a constructor for this class that takes a string argument and stores it inside the object with a string handle. Write a method that prints out stored string. Create a try-catch clause to exercise created exception. 18. Create a package called main to contain classes Main1, Subclass and SamePackage. The Main1 class should contain declaration of variables with different access specifiers without access specifiers, private, public, private protected and protected. Inside the constructor, print all variables. The SubClass is derived from Main1 class. The Subclass and Samepackage class should contain a constructor that tries to access same variables given above. Check if this is possible: a. Create a class called PackTest, which imports above package and creates an object of class SamePackage. b. Create a class called Packtest1, which also imports the same package, but creates an object of class SubClass. 19. Write a java program to accept a word of ten characters into an array. If the accepted characters are in lower case, then they should be converted to uppercase and vice versa. 20. Create an applet to accept an integer as a parameter and display a message

4 as Are you years old? The age should be displayed in blank space. The default age should be Create an applet to display a string I am in center in Courier Font, with size 30 and style bold and italic. This text should be centered both horizontally and vertically. 22. Create an applet to draw a small hut as shown below: 23. Create an applet to obtain a figure as given below. The application should also show the position of mouse as mouse moves over the applet: 24. Create an applet that lets the user adjust its background color. Provide three scrollbars in your applet, one each for three base colors red, green and blue. 25. Create an applet that has its UI components laid out as shown below:

5 Write a frame application that has an Options menu. This menu has circle, rectangle, filled circle and filled rectangle as their menu items. On clicking the relevant options, respective figures should be drawn. 27. Use 3 different ways to create scroll bars. Each of these has the same characteristics. An AdjustmentListener should be fired when the first scroll bar is adjusted. 28. Create an applet with menu bar and add the flowing menus: File, Edit and Search. Add default menu items to respective menus. In the File menu, add the following items: New, Open, Save and Close. While clicking the New menu item, it will popup a message box saying that the New menu item has been clicked. The open and save items will bring appropriate dialog boxes, where one can either choose to open or save a file. Here the program will just print the name of the file being to be opened or saved to the console. 29. Create a Jlist object that displays the elements in the specified array with items of names. When the user double clicks on name in Jlist, the program prints the index of its being clicked to console. 30. Create an applet with 4 Jbuttons. The label for the following buttons are given below: Confirm, Input, Option, Exit After adding the button to the applet, click one of the buttons. The action of clicking one of the button would bring the respective dialog box on to screen except the last button. 31. Write a java program to accept parameters on the command line. If there are no command line arguments entered, the program should print error message

6 and exit. The program should check if the first file exists and if it is an ordinary file. If it is so, then contents of the first file should be copied to second file. In case the first parameter is a directory, print the message accordingly and exit. Appropriate error messages should be displayed at all points. 32. Write a program to accept two file names as command line parameters. Check whether each of them exist in c:\java directory. If it exists, display its name and size, else display the message that it does not exist. Further, if extension of the file is html then it has to be deleted. 33. Write a java program to accept the text from user until he types end in a newline. The name of file to store the contents should be accepted from the user at the command line. If no command line parameters are provided, the program should print error message and exit. Ensure if same file has been created by listing the contents of the same. 34. Write a program that accepts a host name and display its IP address. 35. Write a EchoServer and EchoClient program that display whatever is typed in the server on to client using sockets. 36. Use socket programming to design a client/server application that takes the file name as input, checks whether the file exist and display its contents. 37. Create two threads. One of the threads has to print even numbers and another should print odd numbers. 38. Write a program to display the current date and time. The program should also determine whether current year is leap year or not. Use GregorianCalendar class. 39. Write a RMI program to invoke simple interest calculation method from Client side after accepting principle amount, rate of interest and number of years. 40. Write a JDBC application for registration of participation in National Level Seminar. Store that details in to table after click on submit button. (Assume Suitable Table Structure). 41. Design GUI based JDBC application to navigate (first, last, next, previous) through student records. (Assume suitable table structure).

7 42. Design GUI based JDBC application to search and display employee details from given empid. (Assume suitable table structure) **************