Implement a class named MyArrayList that extends class the java.util. ArrayList. The class MyArrayList overrides the add(obj) method in the following way: it adds obj into the list if the object does not occur in the list or it occurs in the list only once; otherwise, if the object occurs in the list more than once, then the method does nothing.
Answers
Answer:
import java.util.ArrayList;
import java.util.Collections;
public class MyArrayList<T> extends ArrayList<T> {
public boolean add(T obj) {
if (Collections.frequency(this, obj) < 2) {
return super.add(obj);
}
return false;
}
}
Explanation:
According to the requirement, an element with the same value can occur at most twice in the list.
The Collections.frequency utility is useful to count the occurrances.
Sure, here's an implementation of the `MyArrayList` class that extends `java.util.ArrayList` and overrides the `add` method as described:
```java
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
public class MyArrayList<E> extends ArrayList<E> {
"ATTHERATE"Override
public boolean add(E obj) {
// Count occurrences of each element in the list
Map<E, Integer> countMap = new HashMap<>();
for (E element : this) {
countMap.put(element, countMap.getOrDefault(element, 0) + 1);
}
// Check if obj occurs in the list only once or not at all
if (!countMap.containsKey(obj) || countMap.get(obj) == 1) {
return super.add(obj);
}
// If obj occurs more than once, do nothing
return false;
}
}
```
In this implementation, the `add` method first counts the occurrences of each element in the list using a `HashMap`.
Then, it checks whether the given object `obj` occurs only once or not at all in the list. If so, it adds the object to the list using the `super.add(obj)` call.
If `obj` occurs more than once, the method does nothing by returning `false`. This way, the `MyArrayList` class ensures that duplicates are added only once, or not at all, as required.
Know more about java:
https://brainly.com/question/12978370
#SPJ5
Related Questions
Match each code snippet to its appropriate markup language name. XML CSS HTML XHTML
Answers
Answer:
Please find the complete solution in the attached file.
Explanation:
answer:
<p>line break</p><br/> : XHTML
<Address>24, North Block</Address> : XML
<P>New paragraph</P> : HTML
<h2 style=“color:red;font-size:12px;”>Heading in red color.</h2> : CSS
just truuust
Which is the best definition of manageable?
A. asking for help from others
B. making a plan
C. breaking down a big goal into smaller pieces
D. creating multiple goals
Answers
Answer:
D. Creating mutiple goals.
Explanation:
write a program to input 100 students marks and find the highest marks among the them
Answers
Answer:
Explanation:
The following code is a Python program that allows you to input 100 marks. You can input the value -1 to exit the loop early. Once all the marks are entered the program prints out the highest mark among all of them. The output can be seen in the attached picture below with a test of a couple of marks.
marks = []
for x in range(100):
mark = int(input("Enter a mark: "))
if mark == -1:
break
else:
marks.append(mark)
print("Max value: " + str(max(marks)))
Write a function using a loop to approximate the value of PI using the formula given including terms up through 1/99, 1/999 and 1/9999. As the number of iterations increase, the estimate gets closer to the value of PI. The function should accept the number of iterations and return the estimate of PI.
Answers
Answer:
Following are the code to the given question:
#include <stdio.h>//header file
double estPi(int precision)//defining a method estPi that accepts value in parameter
{
double pi = 0, sign = 1, n = 1;//defining a double variable
while (n <= precision) //use while loop that checks n value less than equal to precision
{
pi += sign / n;//defining pi variable that holds quotient value
sign *= -1;//holding value in sign value
n += 2;//increment value in n
}
return 4 * pi;//return value
}
int main() //main method
{
int n;//defining an integer variable
printf("Enter number of iterations: ");//print message
scanf("%d", &n);//input value
printf("Estimated PI is %lf\n", estPi(n));//print method that calls method
return 0;
}
Output:
Please find the attached file.
Explanation:
In the given code a method "estPi" is declared that holds an integer variable "precision" is declared inside the method multiple double variable is declared inside the loop it calculate the value and return its values.
Inside the main method an integer variable "n" is declared that use print method to input the value and accepting value from the user-end and passing value in the method and print its values.
Answer:
Following are the code to the given question:
#include <stdio.h>//header file
double estPi(int precision)//defining a method estPi that accepts value in parameter
{
double pi = 0, sign = 1, n = 1;//defining a double variable
while (n <= precision) //use while loop that checks n value less than equal to precision
{
pi += sign / n;//defining pi variable that holds quotient value
sign *= -1;//holding value in sign value
n += 2;//increment value in n
}
return 4 * pi;//return value
}
int main() //main method
{
int n;//defining an integer variable
printf("Enter number of iterations: ");//print message
scanf("%d", &n);//input value
printf("Estimated PI is %lf\n", estPi(n));//print method that calls method
return 0;
}
Output:
Please find the attached file.
In the given code a method "estPi" is declared that holds an integer variable "precision" is declared inside the method multiple double variable is declared inside the loop it calculate the value and return its values.
Inside the main method an integer variable "n" is declared that use print method to input the value and accepting value from the user-end and passing value in the method and print its values.
Answer: Following are the code to the given question: #include - 1
Explanation:
Thomas owns a small Web services company and currently owns and maintains all his own computing hardware. He plans to develop and test a new service offering that will require his computing capacity to double or triple quickly if it proves successful. How might transitioning to the public cloud help Thomas with this situation
Answers
Answer: Hello the options related to your question is missing attached below are the options
answer : unlimited computing capacity for a low monthly fee ( A )
Explanation:
Since Thomas plans to develop a new service that will require his computing capacity to either double or triple, The best way of transitioning to the public cloud that might help Thomas meet up the requirement is Using unlimited computing capacity for a low monthly fee
Telephone – Cable/ Radio -
Answers
Answer:
Telephone – Cable/ Radio - Wireless
In python, sorry if it’s blurry
Answers
Answer:
nice
Explanation:
lst = [[6,-3,8,0,5,-1,2,-2],[-7,4,3,-5,8,9,1,6]]
neg_values = 0
for x in lst:
for y in x:
if y<0:
neg_values += 1
print(neg_values)
I wrote my code in python 3.8. I hope this helps
6.What does transgenic mean?
Answers
answer:
transgenic means that one or more DNA sequences from another species have been introduced by artificial means.
explanation:
transgenic plants can be made by introducing foreign DNA into a variety of different tissuestransgenic mice are one of the most common animal models usedrelating to or denoting an organism that contains genetic material into which DNA from an unrelated organism has been artificially introduced. being or used to produce an organism or cell of one species into which one or more genes of another species have been incorporated a transgenic mouse transgenic crops and produced by or consisting of transgenic plants or animals.
g Why do database systems support concurrent execution of transactions, despite the extra effort needed to ensure that concurrent execution does not cause any problems
Answers
Answer:
Explanation:
To maintain data consistency and integrity in a large multi-user system, transactions are completed concurrently with the aid of concurrency management techniques.
The following are some of the benefits of concurrent transaction processing and execution versus serial transaction processing and/or execution:
Improved Resource Usage:
A transaction frequently combines both CPU and Input/output activities, resulting in better resource usage. Computers have the ability to run disks and CPUs in parallel. As a result, transactions can also be executed in parallel, with one employing the usage of the CPU and the other using the disk. As a result, resources are better used than in serial transaction processing and execution.
Improved throughput:
Running transactions in parallel has an immediate impact of increasing throughput since a greater number of transactions can be completed in the same period of time.
Lower/shorter waiting time:
Reduced wait time: When transactions are processed sequentially and serially, a short transaction is forced to wait for a longer transaction. Because transactions usually affect distinct portions of the database. As such, it's best if they happen at the same time i.e it is run concurrently.
The characteristics listed above are critical to a system's performance.
Thus, It is obvious that the benefits of concurrency exceed the extra programming work necessary to execute transactions concurrently. As a result, database systems must handle concurrent transactions despite the additional work necessary since it is worthwhile.
Find out the actual instruction given in binary
Answers
Your question is incomplete.
hope its helpful.
Write a class called AddThreeGame that allows two players to play a game in which they alternately choose numbers from 1-9.
Answers
Answer:
Explanation:
The following code is written in Python, it creates the AddThreeGame as requested for 2 players. Outputting the desired output after each player has chosen a number and checking for a winner after every choice. Due to technical reasons, I had to add the code as a txt file below and the output can be seen in the attached picture.
Sean works for an organization that offers SaaS to a chain of boutiques.By getting data from the database,he has to prepare a list of instances when the billing transaction failed.Which of the following tasks does he need to do to prepare the report?
A) Create queries to get relevant data
B) Specify layout and format
C) Establish relationship between data
D) Add data to the report by running it
Answers
Answer: A) Create queries to get relevant data
B) Specify layout and format
D) Add data to the report by running it
Explanation:
SaaS is a software delivery method which allows the access of data from any device when there's a web browser and an internet connection and a web browser.
Since Sean wants to prepare a list of instances when the billing transaction failed, he'll need to:
• Create queries to get relevant data
• Specify layout and format
• Add data to the report by running.
Therefore, the correct options are A, B and D.
which of the following resources type is mostly likely to be shared common resource in a computer network environment
a) printers
b) floppy disk drives
c) speakers
d) keyboards
Answers
Answer:
A )Printer
Explanation:
In office multiple user can send request to print a doc......
In this lab, you complete a C++ program that swaps values stored in three int variables and determines maximum and minimum values. The C++ file provided for this lab contains the necessary variable declarations, as well as the input and output statements. You want to end up with the smallest value stored in the variable named first and the largest value stored in the variable named third. You need to write the statements that compare the values and swap them if appropriate. Comments included in the code tell you where to write your statements.InstructionsEnsure the Swap.cpp file is open in your editor.Write the statements that test the first two integers, and swap them if necessary.Write the statements that test the second and third integer, and swap them if necessary.Write the statements that test the first and second integers again, and swap them if necessary.Execute the program by clicking the "Run Code" button at the bottom of the screen using the following sets of input values.101 22 -23630 1500 921 2 2Provided code:// Swap.cpp - This program determines the minimum and maximum of three values input by// the user and performs necessary swaps.// Input: Three int values.// Output: The numbers in numerical order.#include using namespace std;int main(){ // Declare variables int first = 0; // First number int second = 0; // Second number int third = 0; // Third number int temp; // Used to swap numbers const string SENTINEL = "done"; // Named constant for sentinel value string repeat; bool notDone = true; //loop control // Get user input cout << "Enter first number: "; cin >> first; cout << "Enter second number: "; cin >> second; cout << "Enter third number: "; cin >> third; while(notDone == true){ // Test to see if the first number is greater than the second number // Test to see if the second number is greater than the third number // Test to see if the first number is greater than the second number again // Print numbers in numerical order cout << "Smallest: " << first << endl; cout << "Next smallest: " << second << endl; cout << "Largest: " << third << endl; cout << "Enter any letter to continue or done to quit: "; cin >> repeat; if (repeat == SENTINEL){ notDone = false; } else { cout << "Enter first number: "; cin >> first; cout << "Enter second number: "; cin >> second; cout << "Enter third number: "; cin >> third; } return 0;} // End of main function
Answers
Answer:
Following are the code to the given question:
#include <iostream>//header file
using namespace std;
int main()//main method
{
int first = 0,second = 0,third = 0;//defining integer variable
int temp; //defining integer variable
const string SENTINEL = "done"; // defining a string variable as constant
string repeat;// defining a string variable
bool notDone = true; //defining bool variable
cout << "Enter first number: ";//print message
cin >> first;//input value
cout << "Enter second number: ";//print message
cin >> second;//input value
cout << "Enter third number: ";//print message
cin >> third;//input value
while(notDone == true)//defining a loop to check the value
{
if(first > second)//use if to compare first and second value
{
int temp = first;//defining temp to hold first value
first = second;//holding second value in first variable
second = temp;//holding temp value in second variable
}
if(second > third)//use if to compare second and third value
{
int temp = second;//defining temp to hold second value
second = third;//holding second value in third variable
third = temp;//holding temp value in third variable
}
cout << "Smallest: " << first << endl;//print smallest value
cout << "Next smallest: " << second << endl;//print Next smallest value
cout << "Largest: " << third << endl;////print Largest value
cout << "Enter any letter to continue or done to quit: ";//print message
cin >> repeat;//holding string value
if (repeat == SENTINEL)
{
notDone = false;//holding bool value
}
else //else block
{
cout << "Enter first number: ";//print message
cin >> first;//input value
cout << "Enter second number: ";//print message
cin >> second;//input value
cout << "Enter third number: ";//print message
cin >> third;//input value
}
return 0;
}
}
Output:
Please find the attached file.
Explanation:
Inside the main method Four integer variable "first, second, third, and temp" is declared in which first three variable is used for input value and temp is used to compare value. In thew next step, two string variable "SENTINEL and repeat" is declared in which "SENTINEL" is constant and a bool variable "notDone" is declared. After input the value from the user-end a loop is declared that compare and swap value and print its value.(b) Write a program which displays the following pattern as an output.
*
**
***
****
*****
(Hint: using loop)
Answers
this is the answer for your question i´m guessing i hope this helped :)
******
Which visualization is good to represent values that change with change in time?
Answers
Answer:
???
i would help but gotta explain more
Explanation:
Answer:
A box plot can be helpful when a distribution of values needs to be considered for each time period; each set of box and whiskers can show where the most common data values lie.
Explanation:
Define a method calcPyramidVolume with double data type parameters baseLength, baseWidth, and pyramidHeight, that returns as a double the volume of a pyramid with a rectangular base. calcPyramidVolume() calls the given calcBaseArea() method in the calculation.
Answers
Answer:
The method in C++ is as follows:
double calcPyramidVolume(double baseLength, double baseWidth, double pyramidHeight){
double baseArea = calcBaseArea(baseLength, baseWidth);
double volume = baseArea * pyramidHeight;
return volume;
}
Explanation:
This defines the calcPyramidVolume method
double calcPyramidVolume(double baseLength, double baseWidth, double pyramidHeight){
This calls the calcBaseArea method to calculate the base area of the pyramid
double baseArea = calcBaseArea(baseLength, baseWidth);
This calculates the volume
double volume = baseArea * pyramidHeight;
This returns the volume
return volume;
}
See attachment for complete program that include all methods that is required for the program to function.
Which programming paradigm does the programming language JavaScript follow?
A. procedural programming
B. object-oriented programming
C. functional programming
D. Imperative programming
Answers
Its not functional programming (sorry)
Answer:
Object-oriented programming
Explanation:
Just took the test and got it right
Happy to help !!
what is software? what are two types of software?
Answers
Answer:
Software is the collection of programs which makes computer work. The two types of software are 1)Application software
2)System software
Sam plans to use this image in artwork for a brochure about airplanes. Which principles of page layout is Sam planning to use in this artwork?
A. emphasis
B. repetition
C. balance
D. alignment
E. proximity
Answers
Answer: Alignment
Explanation:
The principle of repitition indicates that some aspect of a design are repeated. This can be in form of bullet list, lines, color etc.
Balance has to do with how the weight is distributed.
The Principle of Alignment means that the pictures on a page should be connected visually to another thing.
Principle of Proximity simoly means that the items that are related on a page should be close to each other.
Therefore, the principles of page layout that Sam is planning to use in this artwork is alignment.
Answer:
D. alignment
Explanation:
What component can you use to open windows?
Answers
Answer:
Start Windows 10 Component Services via the Run dialog box. Press Win+ R keyboard shortcuts to launch Run dialog box, type dcomcnfg or dcomcnfg.exe in the box and click OK/press Enter to open Component Services.
Explanation:
What are two different ways by which a laptop could utilize the cellular network connection of a mobile device
Answers
Answer:
Tethering and hotspot
Explanation:
Tethering and hotspot are the two different ways by which a laptop could utilize the cellular network connection of a mobile device.
Tethering usually involves connecting the computer or smartphone to the internet with the aid of a USB cable while hotspot involves connection of the device to the internet through the WIFI option.
Write a class Bug that models a bug moving along a horizontal line. The bug moves either to the right or left. Initially, the bug moves to the right, but it can turn to change its direction. In each move, its position changes by one unit in the current direction. Provide a constructor
Answers
Answer:
Following are the constructor to the given code:
Bug(int position) //defining a constructor that defines a integer parameters
{
this.position = position;//use this key word to hold parameter value
right = true;//defining a variable right that hold a boolean value
}
Explanation:
In this code, a constructor is declared that defines integer parameters with it, Inside the constructor, this keyword is used to holds the "position" parameter value and defines a boolean variable "right" that holds a boolean value.
Full program:
public class Bug //declaring a class Bug
{
private int position;//declaring integer variable position
private boolean right;//declaring boolean variable
public Bug(int position) //defining a parameterized constructor
{
this.position = position;//use this to hold position value
right = true;//holding boolean value
}
public void turn() //defining a method turn
{
right = !right;//holding value
}
public void move() //defining method move
{
if(right)//use if to check boolean value
{
position++;//incrementing position value
}
else//else block
{
position--;//decreasing position value
}
}
public int getPosition()//defining method getPosition
{
return position;//return position value
}
public static void main(String[] args) //main method
{
Bug bug = new Bug(10);//creating class object
System.out.println("Expected = 10, Actual = " + bug.getPosition());//calling method with printing value
bug.move();//calling method
System.out.println("Expected = 11, Actual = " + bug.getPosition());//calling method with printing value
bug.move();//calling method
bug.move();//calling method
bug.move();//calling method
System.out.println("Expected = 14, Actual = " + bug.getPosition());//calling method with printing value
bug.turn();//calling method
bug.move();//calling method
bug.move();//calling method
System.out.println("Expected = 12, Actual = " + bug.getPosition());//calling method with printing value
bug.turn();//calling method
bug.move();//calling method
System.out.println("Expected = 13, Actual = " + bug.getPosition());//calling method with printing value
}
}
Output:
Please find the attached file.
List 5 properties and metrics for specifying non-functional requirements.
Answers
Answer:
- performance
scalability
capacity
availability
reliability
Which telecommunications service allow Internet and telephone service services to work over the same phone line
Answers
Answer:
VoIP
Explanation:
Voice over Internet Protocol
Answer:
DSL
Explanation:
I took the test and got it right.
In which SDLC step does the company translate broad, user-oriented systems requirements into the detailed specifications used to create a fully developed system
Answers
Answer:
Physical design.
Explanation:
Systems development life cycle (SDLC) is a strategic process that involves determining the overall system architecture, which is typically comprised of hardware, end users, physical processing components, software, and the communication channel that will effectively and efficiently satisfy the essential requirements of the system.
The system inputs and outputs is typically designed along with a plan of how the system's features will be navigated.
Basically, system design is divided into two (2) categories and these includes;
I. Logical design.
II. Physical design.
Furthermore, the design of service systems involves the process of planning, creating infrastructure, building communication, organizing staffs and standardization of a system so as to improve its quality and business relationships between the service provider and its clients.
In the physical design of systems development life cycle (SDLC), broad, user-oriented systems requirements are obtained from end users by companies and then translated into the detailed specifications that would be used to create a fully developed system.
Write a program to sort the (name, age, score) tuples by descending order where name is string, age and score are numbers. The sort criteria is: 1: Sort based on name 2: Then sort based on age 3: Then sort by score The priority is that name < age < score. If the following tuples are given as input to the program: [('John', '20', '91'), ('Jason', '21', '85'), ('Jony', '17', '91'), ('Johny', '17', '93'), ('Tom', '19', '80')]\
Answers
Answer:
The program in Python is as follows:
from operator import itemgetter
m = int(input("Number of records: "))
print("Name, Age, Score")
my_list =[]
for i in range(m):
user_details = input()
my_list.append(tuple((user_details.split(","))))
my_list.sort(key = itemgetter(0, 1, 2))
print("Sorted: ", my_list)
Explanation:
This imports the operator function from itemgetter
from operator import itemgetter
This gets the number of records, m
m = int(input("Number of records: "))
This prints the format of input
print("Name, Age, Score")
This initializes the list of tuples
my_list =[]
This iterates through m
for i in range(m):
This gets the details of each person
user_details = input()
This appends the details to the tuple
my_list.append(tuple((user_details.split(","))))
This sorts the tuple
my_list.sort(key = itemgetter(0, 1, 2))
This prints the sorted tuple
print("Sorted: ", my_list)
Which measurement symbol is this?
PLS HELP
Answers
Answer:
Foot.
Explanation:
Hope this helps!
At each step it should print out the move it makes and its performance score (e.g. S 0.2). Every 5 steps, it should print out a grid, with a "[ ]" on the square where the robot is now. Thus, with the above input, if the robot has done S U S L S, the output would be:
Answers
Answer:
The output would be S 0.2 U 0.2 S 0.2 U 0.2 L 0.2 S 0.2 [ ]
Explanation:
Given that at each step output prints for example S 0.2.
Also given after every 5 steps, it should print a grid "[ ]".
if robot has been given S U S L S, it prints output as
S 0.2 U 0.2 S 0.2 U 0.2 L 0.2 S 0.2 [ ]
What is the difference between autofocus and autocomplete
Answers
Answer:
https://www.c-sharpcorner.com/interview-question/explain-autofocus-and-autocomplete-attribute
found this on a website hope you find it useful !