Question

Please I need java code for this question with output:

4.19)

The Fibonacci sequence is the series of numbers 0, 1, 1, 2, 3, 5, 8, ....
Formally, it can be expressed as:

f ib0 = 0
f ib1 = 1
f ibn = f ibn−1 + f ibn−2
Write a multithreaded program that generates the Fibonacci sequence
using either the Java, Pthreads, or Win32 thread library. This program
should work as follows: The user will enter on the command line
the number of Fibonacci numbers that the program is to generate.
The program will then create a separate thread that will generate the
Fibonacci numbers, placing the sequence in data that can be shared by
the threads (an array is probably the most convenient data structure).
When the thread finishes execution, the parent thread will output the
sequence generated by the child thread. Because the parent thread cannot
begin outputting the Fibonacci sequence until the child thread finishes,
this will require having the parent thread wait for the child thread to
finish,

Answer 1

Please refer to screenshots

code

1 import java.util.*; 2 // java code by extending 3 // the Thread class 4- class Multithreading extends Thread{ private int []array; private int n; // constructor to initialize array public Multithreading (int n, int []arr) { this.array = arr; this.n = n; 15 public void run() { array[0] = 0; // initial values array[1] = 1; for(int i = 2; i <= n; i++) { array[i] = array[i - 1] + array[i - 2]; // generating fibonacci 18 20 22 }

24 // Main Class 25 - public class Main{ 26 - public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.print("Enter value of n, number of fibonacci numbers to be generated: "); int n = sc.nextInt(); // Number of threads int []arr = new int[n + 1]; Multithreading object = new Multithreading (n, arr); // creating thread object.start(); // starting thread try { object.join(); // waiting for child thread to finish 36 - catch (Exception e) { System.out.println(e); 39 40 - // displaying data for(int i = 0; i <= n; i++) { System.out.print(String.valueof(arr[i]) + ' '); 41 42 4

Output

Enter value of n, number of fibonacci numbers to be generated: 12 0 i 2 3 5 8 13 21 34 55 89 144 ...Program finished with exit code 0 Press ENTER to exit console.]

Code to copy

import java.util.*;
// java code by extending
// the Thread class
class Multithreading extends Thread{
  
   private int []array;
   private int n;
  
   // constructor to initialize array
   public Multithreading(int n, int []arr){
        this.array = arr;
        this.n = n;
   }
  
   public void run() {
        array[0] = 0; // initial values
        array[1] = 1;
        for(int i = 2; i <= n; i++){
            array[i] = array[i - 1] + array[i - 2]; // generating fibonacci
        }
   }
}

// Main Class
public class Main{
   public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter value of n, number of fibonacci numbers to be generated: ");
       int n = sc.nextInt(); // Number of threads
       int []arr = new int[n + 1];
       Multithreading object = new Multithreading(n, arr); // creating thread
       object.start(); // starting thread
       try {
            object.join(); // waiting for child thread to finish
        }
        catch (Exception e) {
            System.out.println(e);
        }
       // displaying data
       for(int i = 0; i <= n; i++){
            System.out.print(String.valueOf(arr[i]) + ' ');
       }
   }
}