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denis-greek [22]
3 years ago
9

Which of the following statements about Java Class Libraries is false? Question 18 options: A) An advantage of using Java class

libraries is saving the effort of designing, developing and testing new classes. B) Java class libraries are also known as Java APIs (Application Programming Interfaces). C) Java class libraries consist of classes that consist of methods that perform tasks. D) Java class libraries are not portable
Computers and Technology
1 answer:
Novosadov [1.4K]3 years ago
6 0

Answer:

D) Java class libraries are not portable

Explanation:

The Java Class Library (JCL) is an array of enthusiastically loadable libraries that Java applications can identify and refer to at run time. Since the Java Platform is independent of any particular operating system, applications can’t depend on any of the platform-native libraries.

The library is a massive collection and works of prebuilt classes that is distributed through the Java SE platform.

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Program 7 - Circle You write ALL the code, then run it - Produce the correct output. Turn in code and screen print of successful
fgiga [73]

Answer:

Here is the Circle class:

public class Circle {   // class definition

private int radius;    // private data member of type int of class Circle named radius that stores the value of radius

public Circle(int r) {   // parameterized constructor of class Circle that takes radius as argument

 radius = r;  }    // sets value of radius as r

public int getRadius() {   // accessor method to get the value of radius

 return radius;  }   // returns the current value of radius

public int Diameter() {   // method to compute diameter of a circle

 return radius * 2;  }   // multiply radius value by 2 to compute diameter of Circle

 

public double Area() {   // method to compute area of a circle

 return Math.PI  * Math.pow(radius, 2);   }   //the formula of area is

π x radius² where value of π is get using Math.PI

 

 public double Circumference() {   // // method to compute circumference of a circle

 return 2* Math.PI * radius;   }   }  //the formula of circumference is

2 x π x radius where value of π is get using Math.PI

Explanation:

Here is the Main class:

import java.util.Scanner;  //to accept input from user

public class Main {  //definition of Main class

public static void main(String[] args) {  //start of main method

   

    Scanner scanner = new Scanner (System.in);  //creates Scanner object to take input from user

    System.out.println("Enter radius: ");  //prompts user to enter radius

    int r = scanner.nextInt();  //reads the value of radius from user

 Circle c = new Circle(r);  // calls Constructor of Circle passing r as argument to it using the object c of class Circle

 

    if(c.getRadius()<=0){  //calls getRadius method to get current value of radius using objec and checks if this value (input value of r ) is less than or equal to 0

        System.out.println("Error!");   }  //when above if condition evaluates to true then print this Error! message

    else {  //if the value of radius is greater than 0

System.out.println("the radius of this Circle is: " +c.getRadius());  //calls getRadius method to return current value of r (input value by user)

System.out.println("the diameter of this Circle  is: " + c.Diameter());  //calls Diameter method to compute the diameter of Circle and display the result on output screen

System.out.printf("the circumference of this Circle  is: %.2f", c.Circumference());  //calls Circumference method to compute the Circumference of Circle and display the result on output screen

System.out.println();  //prints a line

System.out.printf("the Area of this Circle  is: %.2f", c.Area()); } }  }

//calls Area method to compute the Area of Circle and display the result on output screen

The program and its output is attached.

7 0
3 years ago
At which stage should James, a website designer, gather information about the website he wants to create, and at which stage sho
viva [34]
<h2>Answer: James should gather information in the <u><em>Learning</em></u> phase and begin the site’s coding in the <u><em>Development</em></u> phase.</h2>

8 0
3 years ago
True or False: Unity can apply multiple textures to a single object or terrain
MaRussiya [10]
This is very true unity is what u said and it is the definition of this
3 0
3 years ago
Write a program that creates a dictionary containing the U.S. states as keys and their abbreviations as values. The program shou
AleksandrR [38]

Answer:

Explanation:

The following program is written in Python. It creates a loop that keeps creating a random number to randomly choose a State abbreviation from the dictionary. Then it asks the user what the state is. If the user gets the answer correct it prints out "Correct" and adds 1 point to the correct variables. Otherwise it prints "Incorrect" and adds 1 point to the incorrect variable. Finally, printing out the final amount of correct and incorrect responses. The program was tested and the output can be seen below.

import random

states = {"AL":"Alabama","AK":"Alaska","AZ":"Arizona","AR":"Arkansas","CA":"California","CO":"Colorado","CT":"Connecticut","DE":"Delaware","FL":"Florida","GA":"Georgia","HI":"Hawaii","ID":"Idaho","IL":"Illinois","IN":"Indiana","IA":"Iowa","KS":"Kansas","KY":"Kentucky","LA":"Louisiana","ME":"Maine","MD":"Maryland","MA":"Massachusetts","MI":"Michigan","MN":"Minnesota","MS":"Mississippi","MO":"Missouri","MT":"Montana","NE":"Nebraska","NV":"Nevada","NH":"New Hampshire","NJ":"New Jersey","NM":"New Mexico","NY":"New York","NC":"North Carolina","ND":"North Dakota","OH":"Ohio","OK":"Oklahoma","OR":"Oregon","PA":"Pennsylvania","RI":"Rhode Island","SC":"South Carolina","SD":"South Dakota","TN":"Tennessee","TX":"Texas","UT":"Utah","VT":"Vermont","VA":"Virginia","WA":"Washington","WV":"West Virginia","WI":"Wisconsin","WY":"Wyoming"}

keys_list = list(states)

correct = 0

incorrect = 0

while True:

   randNum = random.randint(0, 49)

   abbr = keys_list[randNum]

   answer = input("Enter The State name of " + abbr + ": ")

   if answer.lower() == states[abbr].lower():

       print("Correct")

       correct += 1

   else:

       print("Incorrect")

       incorrect += 1

   again = input("Play again? y/n ")

   if again.lower() == 'n':

       break

print("Correct: " + str(correct))

print("Incorrect: " + str(incorrect))

6 0
2 years ago
Why did artists use pinhole cameras during the renaissance?
Dima020 [189]
Pinhole cameras were one of the most sophisticated devices of the period, it made tasks much easier it basically worked exactly like the human eye and is something just like tracing.
8 0
3 years ago
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