
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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- Write a class with a constructor that accepts a String object as its argument. The class should have a method that returns the number of vowels in the string, and another method that returns the number of consonants in the string. Demonstrate the class in a
program by invoking the methods that return the number of vowels and consonants. Print the counts returned.
- Imagine you are developing a software package for an online shopping site that requires users to enter their own passwords. Your software requires that users’ passwords meet the following criteria:
- The password should be at least six characters long.
- The password should contain at least one uppercase and at least one lowercase letter.
- The password should have at least one digit.
Write a program that asks the user to enter a password, then displays a message indicating whether it is valid or not.
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- Pattern and Value are two strings that you must use. The pattern string, which denotes a pattern inside a string, is made up just of the letters a and b. For instance, the string catcatgocatgo matches the pattern aabab (where cat is represented by letter A and go by letter B). Additionally, it matches a, ab, and b pattern. To check whether a value matches a pattern, create a method.arrow_forwardIn some cases, a class depends on itself. That is, an object of one class interactswith another object of the same class. To accomplish this, a method of the classmay accept as a parameter an object of the same class.The concat method of the String class is an example of this situation. Themethod is executed through one String object and is passed another String object as a parameter. Here is an example:str3 = str1.concat(str2);The String object executing the method (str1) appends its characters to thoseof the String passed as a parameter (str2). A new String object is returned asa result and stored as str3. Write java code to implement given conditionsarrow_forwardpublic class Accumulator { private int total private String name; public Accummulator (string name , int total) { this .name = name; this .total=total; } } 3. In a main method, create an object of Accumulator with the name as "Mary" and total as 100.arrow_forward
- python class Student:def __init__(self, first, last, gpa):self.first = first # first nameself.last = last # last nameself.gpa = gpa # grade point average def get_gpa(self):return self.gpa def get_last(self):return self.last def to_string(self):return self.first + ' ' + self.last + ' (GPA: ' + str(self.gpa) + ')' class Course:def __init__(self):self.roster = [] # list of Student objects def drop_student(self, student):# Type your code here def add_student(self, student):self.roster.append(student) def count_students(self):return len(self.roster) if __name__ == "__main__":course = Course() course.add_student(Student('Henry', 'Nguyen', 3.5))course.add_student(Student('Brenda', 'Stern', 2.0))course.add_student(Student('Lynda', 'Robinson', 3.2))course.add_student(Student('Sonya', 'King', 3.9)) print('Course size:', course.count_students(),'students')course.drop_student('Stern')print('Course size after drop:', course.count_students(),'students')arrow_forward# 17 and Java Programarrow_forwardFor your homework assignment, build a simple application for use by a local retail store. Your program should have the following classes: Item: Represents an item a customer might buy at the store. It should have two attributes: a String for the item description and a float for the price. This class should also override the __str__ method in a nicely formatted way. Customer: Represents a customer at the store. It should have three attributes: a String for the customer's name, a Boolean for the customer's preferred status, and a list of 5 indexes to hold Item objects. Include the following methods: make_purchase: accepts a String and a double as parameters to represent the name and price of an item this customer is purchasing. Create a new Item object with this info and append it to the internal list. If the customer is a preferred customer based on the Boolean attribute's value, take 10% off the total sale price. __str__: Override this method to print the customer's name and every…arrow_forward
- 1. Write the method named skipChar()* * You are given a String str. Return a new String* where there are two copies of the first character,* no copies of the second, two copies of the third,* and so on.** Examples:* skipChar("hello") returns "hhlloo"* skipChar("cat") returns "cctt"* skipChar("frog") returns "ffoo"** @param str the String to start with* @return a new String as described here*/arrow_forwardInteger userValue is read from input. Assume userValue is greater than 1000 and less than 99999. Assign tensDigit with userValue's tens place value. Ex: If the input is 15876, then the output is: The value in the tens place is: 7 2 3 public class ValueFinder { 4 5 6 7 8 9 10 11 12 13 GHE 14 15 16} public static void main(String[] args) { new Scanner(System.in); } Scanner scnr int userValue; int tensDigit; int tempVal; userValue = scnr.nextInt(); Your code goes here */ 11 System.out.println("The value in the tens place is: + tensDigit);arrow_forwardWrite a value returning method that accepts two integer values as arguments and returns the value that is the greater of the two. For example, if 6 and 10 are passed as arguments to the method, the method should return 10. Your program should firstly prompt the user to enter two integers, and display the value that is the greater of the two. using Java programmingarrow_forward
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