OOP Lab manual

Object Oriented Programming using Java

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1). Write a Program that displays Welcome to Java, Learning Java Now and Programming is fun.

2). Write a program that solves the following equation and displays the value x and y:
1) 3.4x+50.2y=44.5
2) 2.1x+.55y=5.9
(Assume Cramer’s rule to solve equation ax+by=e x=ed-bf/ad-bc cx+dy=f y=af-ec/ad-bc ).

3). Write a program that reads a number in meters, converts it to feet, and displays the result.

4). Body Mass Index (BMI) is a measure of health on weight. It can be calculated by taking your weight in kilograms and dividing by the square of your height in meters. Write a program that prompts the user to enter a weight in pounds and height in inches and displays the BMI.
Note:- 1 pound=.45359237 Kg and 1 inch=.0254 meters.

5). Write a program that prompts the user to enter three integers and display the integers in decreasing order.

6). Write a program that prompts the user to enter a letter and check whether a letter is a vowel or consonant.

7). Assume a vehicle plate number consists of three uppercase letters followed by four digits. Write a program to generate a plate number.

8). Write a program that reads an integer and displays all its smallest factors in increasing order. For example if input number is 120, the output should be as follows:2,2,2,3,5.

9). Write a method with following method header. public static int gcd(int num1, int num2) Write a program that prompts the user to enter two integers and compute the gcd of two integers.

10). Write a test program that prompts the user to enter ten numbers, invoke a method to reverse the numbers, display the numbers.

11). Write a program that generate 6*6 two-dimensional matrix, filled with 0’s and 1’s , display the matrix, check every raw and column have an odd number’s of 1’s.

12). Write a program that creates a Random object with seed 1000 and displays the first 100 random integers between 1 and 49 using the NextInt (49) method.

13). Write a program for calculator to accept an expression as a string in which the operands and operator are separated by zero or more spaces. For ex: 3+4 and 3 + 4 are acceptable expressions.

14). Write a program that creates an Array List and adds a Loan object , a Date object , a string, and a Circle object to the list, and use a loop to display all elements in the list by invoking the object’s to String() method.

15). Write the bin2Dec (string binary String) method to convert a binary string into a decimal number. Implement the bin2Dec method to throw a NumberFormatException if the string is not a binary string.

16). Write a program that prompts the user to enter a decimal number and displays the number in a fraction. Hint: Read the decimal number as a string, extract the integer part and fractional part from the string

17). Write a program that displays a tic-tac-toe board. A cell may be X, O, or empty. What to display at each cell is randomly decided. The X and O are images in the files X.gif and O.gif.

18). Write a program that moves a circle up, down, left or right using arrow keys.

19). Write a program that displays the color of a circle as red when the mouse button is pressed and as white when the mouse button is released.

20). Write a GUI program that use button to move the message to the left and right and use the radio button to change the color for the message displayed.

21). Write a program to create a file name 123.txt, if it does not exist. Append a new data to it if it already exist. write 150 integers created randomly into the file using Text I/O. Integers are separated by space.

22). Write a recursive method that returns the smallest integer in an array. Write a test program that prompts the user to enter eight integers and display its product.

23). Write a generic method that returns the minimum element in a two dimensional array.

24). Define MYPriorityQueue class that extends Priority Queue to implement the Cloneable interface and implement the clone() method to clone a priority queue.

25). Write a program that reads words from a text file and displays all the nonduplicate words in descending order.The text file is passed as a command-line argument.