Questions and Answers > ERROR HANDLING AND RANDOM. JAVA PROGRAMS FINAL

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ERROR HANDLING AND RANDOM 1. A bag contains balls of 4 different colors- red, green, blue and yellow. Simulate picking up a ball at random for ten times. If the same colored ball is picked more than ... thrice, throw SameColorBallException and proceed with the simulation once again.After 10 valid picks, print the number of balls chosen from each of these colors. 2. Write a program to demonstrate the knowledge of students in working with user-defined packages and sub-packages. Eg., Within the package named ‘primespackage’, define a class Primes which includes a method checkForPrime() for checking if the given number is prime or not. Define another class named TwinPrimes outside of this package which will display all the pairs of prime numbers whose difference is 2. (Eg, within the range 1 to 10, all possible twin prime numbers are (3,5), (5,7)). The TwinPrimes class should make use of the checkForPrime() method in the Primes class. 3. Read the Register Number and Mobile Number of a student. If the Register Number does not contain exactly 9 characters or if the Mobile Number does not contain exactly 10 characters, throw an IllegalArgumentException. If the Mobile Number contains any character other than a digit, raise a NumberFormatException. If the Register Number contains any character other than digits and alphabets, throw a NoSuchElementException. If they are valid, print the message ‘valid’ else ‘invalid’ 5. Define a class ‘Donor’ to store the below mentioned details of a blood donor. Name, age, Address, Contact number, blood group, date of last donation Create ‘n’ objects of this class for all the regular donors at Vellore. Write these objects to a file. Read these objects from the file and display only those donors’ details whose blood group is ‘A+ve’ and had not donated for the recent six months. 9. Write a program to check if two given String is Anagram of each other. Your function should return true if two Strings are Anagram, false otherwise. A string is said to be an anagram if it contains the same characters and same length, but in a different order, e.g. army and Mary are anagrams. 10., If there are 4 batches in BTech - “CSE1007” course, read the count of the slow learners (who have scored <25) in each batch. Tutors should be assigned in the ratio of 1:4 (For every 4 slow learners, there should be one tutor). Determine the number of tutors for each batch. Create a 2-D jagged array with 4 rows to store the count of slow learners in the 4 batches. The number of columns in each row should be equal to the number of groups formed for that particular batch ( Eg., If there are 23 slow learners in a batch, then there should be 6 tutors and in the jagged array, the corresponding row should store 4, 4, 4, 4, 4,3). Use for-each loop to traverse the array and print the details. Also print the number of batches in which all tutors have exactly 4 students. 11. Write a program to read a chemical equation and find out the count of the reactants and the products. Also display the count of the number of molecules of each reactant and product. Eg., For the equation, 2NaOH + H2SO4 -> Na2SO4+ 2H2O, the O/P should be as follows: (1) Reactants are 2 moles of NaOH, 1 mole of H2SO4. (2) Products are 1 mole of Na2SO4 and 2 moles of H2O. 12. Assume that a bank maintains two kinds of accounts for customers, one called as savings account and the other as current account. The savings account provides compound interest and withdrawal facilities but no cheque book facility. The current account provides cheque book facility but no interest. Current account holders should maintain a minimum balance and if the balance falls below this level, a service charge is imp 13. Assume only a maximum of 3 courses can be registered by a student for week end semester classes. Create a hashmap ‘h1’ with ‘n’ key-value pairs where keys are the names of students and values are the courses registered by them. Create another hashmap ‘h2’ with ‘m’key-value pairs where keys are the names of courses offered for B.Tech and values are the names of faculty handling the courses. Write appropriate code to: 14. Write a program to continuously read input values from the user. The program should terminate if exactly three String values have been inputted. Display the count of integer values and float values entered so far. Also display the average of all integer values and all float values individually. 15. Create a class StudentGrade with member determineGrade( ) that accepts register number (String) and marks (float-type) of a student in all courses he has registered for a particular semester. 16. Write a program to define a static method sum_Squares( ) to find the sum of the squares of the first 'n' natural numbers and a non-static method square_Sum( ) to find the square of the sum of those 'n' natural numbers. Invoke these methods frommain( ) method to evaluate the difference between the values returned by them. 17. The following list gives the amount of rainfall (in cms) recorded at a particular place for 12 month. Store these values in an array. Find the average rainfall and display the count of the number of months in which the rainfall is more than the average. Ans 18. Write a program to print the following patterns using loops. Ans 19. Write a program called NumberGuess to play the number guessing game. The program shall generate a random number between 0 and 99. The player inputs his/her guess and the program shall response with "Too higher", "Too lower" or "Congratulations! You got it.." accordingly. 20. Create a class Film with string objects which stores name, language and lead_actor and category (action/drama/fiction/comedy). Also include an integer data member that stores the duration of the film. Include parameterized constructor, default constructor and accessory functions to film class. Film objects can be initialized either using a constructor or accessor functions. 21. Write a program to demonstrate the knowledge of students in advanced concepts of Java string handling. 22. Write a program to demonstrate the knowledge of students in creation of abstract classes and working with abstract methods. 23. Write a program to demonstrate the knowledge of students in working with Inheritance. Create classes to implement the following hierarchy. 24. Create Exception class called BookQuantityNotAvailableException and use it in the class called “Store” which is described by its bookId title, author, price and quantityAvailable. Include a method called purchase() taking the purchase quantity as a parameter and update the quantityAvailable appropriately. Create a package containing the Store and a Exception class. Write a java program to test the working of the Store class. Book Store 25. You are required to compute the power of a number by implementing a calculator. Create a class MyCalculator which consists of a single method long power(int, int). This method takes two integers, n and p, as parameters and finds np. If either n or p is negative, then the method must throw an exception which says "n and p should not be negative". Also, if both n and p are zero, then the method must throw an exception which says " n and p should not be zero " Complete the function power in class MyCalculator and return the appropriate result after the power operation or an appropriate exception as detailed above. Ans 26. Write a Java program to Print alternate numbers using 2 Threads. Ans 27. Write a program to generate the Tribonacci sequence. (Tribonacci numbers are a sequence of numbers T(n) similar to Fibonacci numbers, except that a number is formed by adding the three previous numbers, i.e., T(n)=T(n-1)+T(n-2)+T(n-3), T(1)=T(2)=1, and T(3)=2). Ans 28. Student volunteers from three batches of B.Tech are selected to ensure the smooth conduct of a Technical event. Assume that only 4 volunteers from batch1, 3 volunteers from batch2, 1 volunteer from batch3 are selected. Create a 2-D ragged array of strings to store their register numbers batch wise. The first row stores register numbers of the volunteers in batch1, second row – batch2 and so forth. Use for-each loop to traverse the array elements. 29. An ISBN (International Standard Book Number) consists of 10 digits d1d2d3d4d5d6d7d8d9d10. The last digit d10 is a checksum, which is calculated from the other nine digits using the following formula: 30. VIT honors its employees with 100% attendance in an academic year with a certificate of appreciation. Assume there are 2000 employees. Create an array to store their attendance percentage. The array can be populated with random numbers. Create two threads so that thread1 determines the total count of employees eligible for certificate in the first half of the array and thread2 in second half of the array. The main( ) has to wait till both the threads complete their task and arrive at a final count indicating the total number of employees eligible for the certificate of appreciation. VIThonors.java [Show More]

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