Answered: 4/22/2021 assignment: Write a program…

4/22/2021 assignment: Write a program to draw the interface for size calculator. The button can be determined by button[i] [j].setPrefSize(50, 50). Calculator 1 2 3 4 6. 8. 9. Clear 7,

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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import java.util.ArrayList; /** * This class describes a user of Twitter. A user has a user ID * (e.g. @testudo), a list of tweets, a count of the number of followers, * and a list of users that this user follows. Unlike P5, * there is no upper limit on the number of tweets or users to follow. * * You may NOT import any library class other than java.util.ArrayList. * You may NOT add any instance variables to keep a count of the number * of tweets or users being followed. You may add instance variables * for other purposes as long as they are private. */public class TwitterUser { private String userID; private int followers; private ArrayList<Tweet> listTweets; private ArrayList<TwitterUser> toFollow; /** * A constructor that takes the user's ID. If the ID is null, or * longer than 32 characters, or it does not start with "@", * throw an IllegalArgumentException. * * All other instance variables should be initialized…
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The People class holds an unsorted list of humans. Initially, this list is empty. Existing Human objects may be added to the list using an insert method. Upon inserting a Human object, it is added to the array at the next available position and the position value in incremented. If the position value is equal to the size value, do not insert the Human. Instead, throw an exception that your driver can catch to print an error that the People object is full. Create a People class with the following features: Each People object has a statically allocated array of Human objects. Size attribute representing the maximum size of the array. Position attribute representing the next free position in the array. Default constructor with no arguments. Search method that takes a string argument and returns a Human object. This method returns the first Human object with a name matching the string argument. In other words, pass the name of a Human as a string, search the list of humans for…
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