Which method(s) must a serializable class, implement?
? It must always implement both readObject andwriteObject

? It must implement either readObject orwriteObject, or both, depending upon the

desired behavior

? No Need to implement any methods

? None of the given option is correct

Answer:

import java.util.*;

import java.lang.*;

import java.io.*;

class Codechef

{

public static void main (String[] args)

{

    Stack<Integer> mat=new Stack<Integer>();

    mat.add(1);

    mat.add(3);

    mat.add(6);

    System.out.println(mat);

    Object [] a=mat.toArray();

    for(int i=0;i<a.length;i++)

    System.out.println(a[i]);

}

}

Explanation:

An integer type stack st is created;

1,3 and 6 are added to the stack.

printing the contents of the stack.

array a is created form the stack using toArray().

Then printing the array.

Answer:

The command to create a compressed archive (archive1.tar.gz) is

[tex]tar\,\,-czvf\,\,archive1.tar.gz\,\,test1\,\,test2\,\,test3[/tex]

Explanation:

The explanation for the above command is

The general command to create a compressed archive is

tar -czvf name-of-archive.tar.gz /path/to/directory-or-files

Here, the terms are as follows:

-c : Creates an archive

-z : Compress the archive with gzip.

-v : This is known as verbose. This is an optional command and it displays the progress on terminal command. Without this the progress is not displayed on terminal command.

-f : Allows to specify the file name of the archive.

Here, if we want to archive multiple files, we provide the command the names of multiple files or directories of the files also can be used.

So, the command [tex]tar\,\,-czvf\,\,archive1.tar.gz\,\,test1\,\,test2\,\,test3[/tex]

creates a compressed archive  - archive1.tar.gz of files test1, test2 and test3.

To create a compressed archive file named archive1.tar.gz containing the files test1, test2, and test3, use the command: tar -cvzf archive1.tar.gz test1 test2 test3.

This command creates and gzips the tarball with verbose output. For This Question use the following command:

tar -cvzf archive1.tar.gz test1 test2 test3

In this command:

Answer: UCSPI-TCP is the sort of domain for the public that helps in building the client-server application of TCP using the command line tool of UNIX TCP in qmail

Explanation: UCSPI-TCP is referred as the UNIX Client-Server Program Interface with the help of TCP (transfer control protocol) .It is usually used for the management of the IP (internet protocol) present on the server and checks which IP's should be permitted for the connection with SMTP(simple mail transfer protocol)services.It also manages the variable or the environment constant that IP want to utilize .

Answer: Operating system, Device driver, Firmware, Translator and Utility are the categories of system software.

Explanation:

Software can be either System software or Application software.

System software includes software to manage resources of the system such as hardware, input/output, and other machine level operations such as translation and compilation of programs.

System software can be categorized into

1 – Operating system: OS forms the interface between the user and hardware. OS hides the complexities of the hardware and provides a graphical user interface to the user for interaction with the system.

2 – Device driver: Every device has its own device driver. The driver forms the interface between the OS and the actual device. The operating system assigns the duties of the device to its driver.

3 – Firmware: This software is programmed on the memory chip. Any upgrades to this software is done by replacing the existing chip with new chips. Hence, this software is firm as per the name unlike other software which can be updated without replacing any component.

4 – Translator: This software translates programming language code to machine language instructions. Compilers, assemblers and interpreters are the types of translator. Translator may either translate complete code or one line of code at a time.

5 – Utilities – This software performs diagnostic and maintenance of the system. Examples include anti-virus, disk partition, data recovery, and the like.

System software vs Application software

1- System software manages computer resources.

Application software performs a particular task for the end user.

2- Installed according to the operating system used.

Applications are installed based on user’s needs.

3- System software works in the background and hence, no user interaction needed.

Application software are intended for the user and enable user interaction.

4- System software execute independently irrespective of applications.

Application software can only execute on the system software.

5- Examples include device driver, data recovery, etc.

Applications include excel, database, etc.

Answer: Queuing systems

Explanation:

We have  the queuing theory which gives us the in depth knowledge of queuing systems which helps us to predict the queue length and the waiting time at the respective nodes in an network. A group of queuing systems together constitute the queuing network. The queuing theory helps to cope with the demand of various services in an queuing network composed of queuing systems.

Answer:

1. 45

2. 90

3. 161

4. 227

Explanation:

Binary starts off with the first bit equaling 1 and then each subsequent bit being double the previous bit from right to left, so.

128, 64, 32, 16, 8, 4, 2, 1 In this example. If you imagine each 1 or 0 being and on or off for the value it's related to, you just add the numbers together that are on (with a 1 on them)

Answer:

#include <iostream>

using namespace std;

int main()

{

   int num;

   cout<<"Enter the integer: ";

   cin>>num;

   while(num>0){

       int rem = num%10;

       cout<<rem<<endl;

       num = num/10;

   }

}

Explanation:

First include the library iostream in the c++ programming for input/output.

Then write the main function and declare the variable.

cout is used to display the message on the screen.

cin is used to store the value in the variable.

then used the while loop and put the condition num>0

after that, take the reminder of the number by using the operator modulus '%'.

and then print it on the screen.

after that reduce the number by one digit.

This process continue until the condition not failed.

Therefore, the all digits of the number will be printed.

Answer:

#include<stdio.h>

//main function

int main(){

   //initialization of variable

   int temp_sum=0;

   int x,i;

   //display the message

   printf("Enter the number:");

   scanf("%d",&x);//read the number and store in the variable

   //for loop which run 2*num_1 times

   for(i=x;i<=2*x;i++){

       temp_sum = temp_sum + i;  //adding

   }

   //display the output

   printf("The sum is: %d",temp_sum);

   return 0;

}

Explanation:

Include the library stdio.h for using input/output function in c programming.

Create the main function and declare the variables.

display the message on the screen by output function printf().

read the value enter by the user and store in the variable using scanf().

Then, it takes the for loop statement which runs again and again until the condition not false.

the for loop start from value x enter by the user and the loop goes running 2 * x times.

in the for loop, add the number continuously and after the loop terminate.

the output print on the screen.

Lets dry run the code:

suppose initially, temp_sum=0, x = 4, i = 4.

the for loop start from 4, it check the condition 4 <= 8, condition True.

then,

temp_sum = 0 + 4 which is 4 assign to temp_sum.

then, loop increment the value of i and it becomes 5.

This process continues until the condition not false.

after that print the output store in the temp_sum.

Answer:

int* calculate(int a,int b,int c){

   int result[] = {0,0};

   int sum = a+b+c;

   int product = a*b*c;

   result[0] = sum;

   result[1] = product;

   return result;

}

Explanation:

The function is a block of the statement which performs the special task.

The function can return one integer, not more than one integer.

If we want to return multiple values then, we can use array.

we store the result in the array and return that array to the main function.

This is the only possible way to return multiple values.

So, define the function with return type array and declare the array with zero value.

Then, calculate the values and store in the variable after that, assign to the array.

Finally, return that array.  

Answer:

#include //Line 1

namespace aaa //Line 2

{ const int X = 0; //Line 3

double y; //Line 4

}

using namespace std; //Line 5

int main() //Line 6

{ y = 34.50; //Line 7

cout << "X = " << X << ", y = " << y << endl; //Line 8

return 0; //Line 9

}

In Line 1, No header file is present,so it will print output as cout and endl is not defined.

we should include <iostream> header file in line 1  

Lines 7 and 8 are incorrect.

X and y variables in aaa namespace are stated. So we can't use it any other namespace(std), but here y is initialized to 34.50 and x is printed in other namespace rather than stated.

Answer:

T

Explanation:

The java.lang.Throwable class implements the Serializable interface.

If a class implements an interface then all its subclasses also implicitly implement the interface.

Note that all Exception classes in Java inherit from java.lang.Throwable. Since Throwable is Serializable, by implication, all java Exception classes are also Serializable by default. That is, all exception classes can be serialized to a file or sent over the network is required.

Answer:

WLAN's or Wireless LAN Units have 2 main modes of operation

Explanation:

The Two Main modes of Operation are the following

Infrastructure Mode: in this mode the main WLAN unit becomes the main connection point in which all devices are connected to and the main unit provides an internet connection to all the devices connected to it.

Ad Hoc Mode: in this mode devices transfer data from one another back and forth without permission from a base unit.

Some WLAN units will also include 2 extra modes of operation called Bridge and Wireless Distribution System (WDS).

Bridge Mode: this mode allows the base unit to act as an intermediary and bridge two different connection points. Such as bridging a wired connection with a wireless one.

WDS Mode: this mode uses various access points to wirelessly interconnect devices to the internet using repeaters to transmit connections. It can provide internet to both wired and wireless clients.

I hope this answered your question. If you have any more questions feel free to ask away at Brainly.

Answer:

True.

Explanation:

A method can not be made final until whole class is madefinal.

Answer: MDM softwares

Explanation:

Here MDM refers to mobile device management software which provides people with the facilities of updating, installing creating backup of various mobile devices within an organisation. Moreover these software's provides tools for proper monitoring and to report their usage across various independent mobile device users. MDM is often used or interconnected with the term BYOD(Bring your own device), whereby employees of an organisation bring their own mobile devices and they are being managed by a MDM software centrally.

Answer:

JAVA program for the given question is as below.

public class MyProgram {

   public static void main(String args[]) {    

     int len = 5;

     int[] scores = new int[len];      

     scores[0] = 7;

     scores[1] = 10;

     scores[2] = 11;

     scores[3] = 9;

     scores[4] = 10;      

     System.out.print("This program sets each element to the sum of itself and the next element except the last element.");

     System.out.println();      

     System.out.println("The initial elements are ");

     for(int i=0; i<len; i++)

     {

         System.out.print(scores[i]+" ");

     }      

     // new line is inserted    

     System.out.println();  

     System.out.println("The elements after addition are ");

     for(int i=0; i<len; i++)

     {

// addition is not done for last element

         if(i != len-1)

               scores[i] = scores[i] + scores[i+1];                

       // elements of array printed backwards beginning from last element

       System.out.print(scores[i]+" ");

     }      

   }

}

OUTPUT

The elements of array are  

7 10 11 9 10  

The elements of array backwards are  

10 9 11 10 7  

Explanation:

This program uses for loop to display and add up the array elements.

The length of the array is determined by an integer variable, len.

The len variable is declared and initialized to 5.

int len = 5;

The array of integers is declared and initialized as given.

int[] scores = new int[len];

We take the array elements from the question and initialize them manually.

First, we print array elements in sequence using for loop.

for(int i=0; i<len; i++)

To display in sequence, we begin with first element which lies at index 0. The consecutive elements are displayed by incrementing the value of variable i.

The array element is displayed followed by space.

System.out.print(courseGrades[i]+" ");

Next, we set each array element to the sum of itself and the following element except the last element.

if(i != len-1)

               scores[i] = scores[i] + scores[i+1];

We also display these elements simultaneously.  

The length and elements of the array are initialized manually and can be changed for testing the program.

Answer:

JAVA program for the given question is as below.

public class MyProgram {

   public static void main(String args[]) {    

     int len = 5;

     int[] scores = new int[len];      

     scores[0] = 7;

     scores[1] = 10;

     scores[2] = 11;

     scores[3] = 9;

     scores[4] = 10;      

     System.out.print("This program sets each element to the sum of itself and the next element except the last element.");

     System.out.println();      

     System.out.println("The initial elements are ");

     for(int i=0; i<len; i++)

     {

         System.out.print(scores[i]+" ");

     }      

     // new line is inserted    

     System.out.println();  

     System.out.println("The elements after addition are ");

     for(int i=0; i<len; i++)

     {

// addition is not done for last element

         if(i != len-1)

               scores[i] = scores[i] + scores[i+1];                

       // elements of array printed backwards beginning from last element

       System.out.print(scores[i]+" ");

     }      

   }

}

OUTPUT

The elements of array are  

7 10 11 9 10  

The elements of array backwards are  

10 9 11 10 7  

Explanation:

This program uses for loop to display and add up the array elements.

The length of the array is determined by an integer variable, len.

The len variable is declared and initialized to 5.

int len = 5;

The array of integers is declared and initialized as given.

int[] scores = new int[len];

We take the array elements from the question and initialize them manually.

First, we print array elements in sequence using for loop.

for(int i=0; i<len; i++)

To display in sequence, we begin with first element which lies at index 0. The consecutive elements are displayed by incrementing the value of variable i.

The array element is displayed followed by space.

System.out.print(courseGrades[i]+" ");

Next, we set each array element to the sum of itself and the following element except the last element.

if(i != len-1)

               scores[i] = scores[i] + scores[i+1];

We also display these elements simultaneously.  

The length and elements of the array are initialized manually and can be changed for testing the program.

Answer:

#include<stdio.h>

#include<stdbool.h>

bool isEven(int x);

main()

{

int n;

bool v;

printf("Enter an integer: \n");

scanf("%d", &n);

v = isEven(n);

if(v==true)

 printf("\n The integer is even");

else

 printf("\n The integer is odd");

}

bool isEven(int x)

{

if(x%2==0)

 return true;

else

 return false;

}

Explanation:

if the integer is divided by 2 then the integer is even

else the integer is odd.

Answer:

a)Firmware Computers and Virtual Computers

Firmware Computers-A type of computer program that offers low-level device-specific hardware control.Once installed, the firmware is generally altered rarely and only by the manufacturer's updates. Firmware loss can often lead to the loss of function of a hardware device depending completely on the scenario.

Virtual Computers-The most common purpose of the software is to describe a program/piece of data to be changed, viewed or otherwise interacted by the user most often.A software or firmware upgrade allows a continuous change — generally a feature enhancement, performance enhancement, or error correction

b) Early binding and Late Binding

Early binding-The compiler matches the function call at compile time in early binding with the right function definition. It can be called as Compile-time Binding/Static Binding. The compiler defaults to the feature definition called during the moment of compilation. So, because of early binding, all the feature calls you've studied up to now.

Late binding-The compiler matches the function call at run-time with the right function definition in the event of late binding. It is also referred to as Run-time Binding.

The compiler defines the object type at run-time in late binding and then checks the function definition with the function call.

c) BNF and EBNF

BNF(Backus – Naur form)-It is used to officially describe a language's grammar, so there is no discrepancy or ambiguity about what is permitted and what is not. In reality, BNF is so unambiguous that there is a lot of mathematical theory around this kind of grammar, and you can effectively build a parser mechanically for a language with a BNF grammar.

EBNF(Extended Backus–Naur form)-It is used to convey a grammar that is context-free. EBNF is used to describe formally a formal language such as a language for computer programming. This is extension metasyntax notation of the fundamental Backus – Naur form (BNF).

Answer:

jfff

Explanation:

Answer:

30,33,37,18,23,34,15,38,40,17

To construct the AVL tree, follow these steps and diagrams are shown in the image:

• Add 30 to the tree as the root node. Then add 33 as the right child because of 33 is greater than 30 and AVL tree is a binary search tree.

• Then add 37 as the right child of 33. Here the balance factor of node 30 becomes 0-2 = -2, unbalanced.

Use RR rotation, make node 33 the root node, 30 as the left child of 33 and 37 as the right child of 33.

• Now add 18 as the left child of 30. And 23 as the right child of 18. Here the balance factor of 30 becomes 2-0 = 2. It’s unbalanced.

Use LR rotation, make 23 the parent of 18 and 30.  

• Now add 34 as the left child of 37 and 15 as the left child of 18. Add 38 as the right child of 37. And then add 40 as the right child of 38.

• Now adding 17 as the right child of 15 makes the tree unbalanced at 18.

Use LR rotation, make 17 as the parent of 15 and 18.

Explanation:

The balance factor of a node can be either 0,1 or -1. Else the tree is called unbalanced at the node.

If the inserted node is in the left subtree of the left subtree of the unbalance node, then perform LL rotation.

If the inserted node is in the right subtree of the right subtree of the unbalance node, then perform RR rotation.

If the inserted node is in the left subtree of the right subtree of the unbalance node, then perform RL rotation.

If the inserted node is in the right subtree of the left subtree of the unbalance node, then perform LR rotation.

Answer:

a) Time, Schedule, and Cost

Explanation:

Great question, it is always good to ask away and get rid of any doubts that you may be having.

The triple constraints are represented by a triangle whose sides are three a different aspects which represent a Quality Project when combined. These three aspects are Time, Schedule (Scope), and Cost. This  model has been used by companies since the 1950's, and is still widely used in today's companies.

I hope this answered your question. If you have any more questions feel free to ask away at Brainly.

Answer:

false

Explanation:

Answer:

7

Explanation:

Because the q.length is a inbuilt function in the programming which used to get the length of the array. In the array, there are 7 values are store. Therefore, the size 7 store in the variable z.

For example:

int[] array={1,2};

int x = array.length;

the answer of above code is 2, because the elements present in the array is 2.

Final answer:

Persistent objects are stored permanently in a database, while transient objects are not and are lost when the application that created them is closed. OO database systems handle persistence by storing objects in designed database tables and often use an ORM tool to manage serializing object states for storage.

Explanation:

In the context of object-oriented databases, persistent objects are those that continue to exist after the application that created them has ended. Their state is saved in a non-volatile storage system like a database, allowing them to be retrieved and used by other applications or instances of the same application in the future. On the other hand, transient objects only exist during the lifetime of the application instance that created them; once the application is closed, transient objects are lost because they are not stored permanently.

How Persistence is Handled in OO Database Systems:

In typical object-oriented (OO) database systems, persistence is handled by storing objects in tables within the database. These tables are designed during the database design phase and are created to hold all of the necessary attributes and relationships that define the object. The process of persisting objects involves serializing the object's state and storing it in the database, often using an Object-Relational Mapping (ORM) tool that abstracts the complexity of the underlying database operations.

It is important to note that the concept of persistence of objects from LibreTexts™ is a philosophical concept about whether objects continue to exist out of perception, whereas in computer science, it refers to the longevity of data beyond the lifecycle of the program that creates it. In contrast, the problem of other minds pertains to the philosophical inquiry about the existence and nature of consciousness in others which is not directly related to database systems.

Answer:

Interrupt descriptor table

Explanation:

In x86 architecture we use Interrupt descriptor table(IDT) which is data structure to produce an Interrupt vector table(IVT). The processor uses the IDT to form the right reaction to interrupts and exceptions.

It is the equivalent of the Protected mode to the (Interrupt Vector Table(IVT)) Real mode stating at the position of Interrupt Service Routines (ISR)  (one per interrupt vector).

Address and size of IDT  is kept in the CPU's IDTR register. LIDT, SIDT instructions are used for storing.

Answer:

Embedded system is defined as, it is the combination of between hardware and software which performed various specific tasks. It is a dedicated functions which contain large electrical and mechanical components. Basically it is the real time computing constraint.

Example: Printers, washing machine and automobiles.

Characteristics of embedded system are:

Answer: Sendmail and Qmail are the mail transferring agents which carry out the process of sending the mail. they also have differences between them .

Explanation: Comparison between sendmail and Qmail are as follows:-

Answer:

a.

,

Explanation:

The array is used to store the multiple data with  same data type.

Syntax for initialization of array:

type name[] = {data_1, data_2, data_3,....};

the comma ',' is used to separate the data with other data.

for example:

int array[] = {1,2,3,4,5};

we cannot used dot '.', colon ':' and semicolon ';' as separator.

Answer:

Network layer

Explanation:

Network layer is used when devices from different network involves communication.So,network layer is not required if devices communicate in a same network.

The network layer is concerned with the selection of network paths.

The network layer is the layer in OSI Model. This layer provides data routing paths for communication. Data is transferred on nodes via packets in an order controlled by the network layer.

This layer includes hardware devices such as bridges, firewalls ,routers and switches, but it effectively generates a logical image of the most effective communication path and implements it with a physical medium.

Answer:

 For encoding signed integer the two's complement scheme are used as, the number can be positive, with no fraction part and it can be negative. The computer can stored information in the form of bits and the value with the zero and one. Encoding of signed number in the two's complement with the positive integer it can be done by binary number.

Answer:

All three of them are linear Data Structures.

A stack is a FILO(First In Last Out) or LIFO(Last In First Out)  type data structure means first inserted element will be the last one to be removed form the stack.Insertion and Deletion is from one end only called head.

ex:-A stack of books on the shelf.

A queue is FIFO(First In First Out) type means the first inserted element will be the first one to be removed.In queue insertion is from the back or tail and removal of elements is done form the front.

ex:-A queue at the ticket counter.

In array each element stored is given an index, by which we can be access the element very easily. We can use this index to modify or store element at that index of the array. i.e any object can be accessed with the right index, unlike queue and stack.

We can access only the front and back in the queue.In stack we can access only the top but in array we can access any element with the index.