4. The following code should define the class Text Message, create a list of instances of thatclass in the main method, and call instance methods to display the message chain.Unfortunately, there are errors in this code - circle at least 4 errors and fix each one.class Text Message:def init (self, sender, receiver, message, timestamp):self.sender = senderself.receiver = receiverself.message = messagearbioms to bus self.timestamp = timestampifdef getSender (self):return senderdef getReceiver (self):def getMessage(self):return self.receiverdef getTimestamp():def main():return self.message/selfreturn self.timestamptextChain =_nameSelf-sender[]"142026"for message in textChain:textChain.append(TextMessage("Ava", "Basil", "Dinner at 6?", 142026))textChain.append (Text Message("Basil", "Ava", "Sure! Meet outsideBlanch?"))print (strmsg)== "__main__":main()botail307 EomstayebutstrMsg = message.getSender() +to+ message.getReceiver() +at + message.getTimestamp () + ": " + message.getMessage()

all the highlited ones are correct

4. The following code should define the class Text Message, create a list of instances of that class in the main method, and call instance methods to display the message chain. Unfortunately, there are errors in this code - circle at least 4 errors and fix each one. class Text Message: 3 def init (self, sender, receiver, message, timestamp):

4. The following code should define the class Text Message, create a list of instances of that class in the main method, and call instance methods to display the message chain. Unfortunately, there are errors in this code - circle at least 4 errors and fix each one. class Text Message: 3 def init (self, sender, receiver, message, timestamp):

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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1) Through BlueJ, the class must define a method called isSpace that allows the book club staff to determine whether there is enough capacity for a group to attend. This method must take a single integer parameter representing the size of the group, and return a boolean result. The method must work as follows: If the value of the parameter is less-than or equal-to 0 then the method must return false. This case has priority over those following. If the value of the parameter is less-than or equal-to the space left in the book club (use the capacity and occupancy values in the to work this out) then the method must return true. Otherwise (i.e., if there is not space in the book club for the whole group) then the method must return false. 2) This method must not change the state of the BookClub object. In other words, both the current number of occupants and the capacity of the club must be exactly the same after it is called as it was before (Note that the return type of this method…
For the programming language Java
What is the main difference between a struct and a class? (More than 1 answer can be chosen)
17. Create a class ShuffleCipher that implements the interface MessageEncoder, as described in Exercise 15. The constructor should have one parameter called n. Define the method encode so that the message is shuffled n times. To perform one shuffle, split the message in half and then take characters from each half alternately. For example, if the message is abcdefghi, the halves are abcde and fghi. The shuffled message is afbgchdie. (Hint: You may wish to define a private method that performs one shuffle.)
5. Given the Java Point class (which contains two private variables x and y and constructors that allows creating a point object with known x and y values as well as other methods such as equals( ), toString( ) etc), (a). define a new class called Circle that contains private two variables: center which is a Point object from the Point class and radius which is of type double. The Circle class must have the following methods: (b). add a constructor which creates a circle object using a center point with x and y values and a radius as its parameters. (c). add a default constructor. ( (d). add an equals() method that can compare if any object is equal to a Circle object (two circle objects are equal if they have the same center point with the same radius). (e). add a toString() method that prints a Circle object with the center point and radius.
Write a class definition line and a one line docstring for the class Dog. Write an __init__ method for the class Dog that gives each dog its own name and breed. Test this on a successful creation of a Dog object.>>> import dog>>> sugar = dog.Dog('Sugar', 'border collie')>>> sugar.name'Sugar'>>> sugar.breed'border collie' Add a data attribute tricks of type list to each Dog instance and initialize it in __init__ to the empty list. The user does not have to supply a list of tricks when constructing a Dog instance. Make sure that you test this successfully.>>> sugar.tricks[] Write a method teach as part of the class Dog. The method teach should add a passed string parameter to tricks and print a message that the dog knows the trick.>>> sugar.teach('frisbee')Sugar knows frisbee