Question

Please write in java program

Write an application that generates 100 random integers between 1 and 75 and writes them to a file named "file_activity.txt". Read the data back from the file and display the following:

• The sum of the numbers in the file
• The average of the numbers in the file
• The numbers in the file in increasing order

To sort an array:
int[] arr = new int[20];
Arrays.sort(arr); -- this sorts an array

To sort an ArrayList:
ArrayList<Integer> aLst = new ArrayList<>();
Collections.sort(aLst);

Note: The array and ArrayList in the above examples are empty. Create your array/ArrayList, put the data from the file in the array/ArrayList, then sort it.

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Answer 1

package datastructure;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Random;
import java.util.Scanner;

public class Test {
  
  
  
  
  
public static void main(String args[]) throws FileNotFoundException
  
{
  
  
   // create file object
File fp=new File("C:\\Users\\CHITTIMALLA\\Desktop\\file_activity.txt");
  
  
// to write the file
PrintWriter out= new PrintWriter(fp);
Random rand = new Random();
  
  

      
      
   for(int i=0;i<100;i++)  
   {
      
   
int num= rand.nextInt(75) + 1; // generates random integers between 1 to 75
out.println(num);
out.flush();


  
   }
  
   int[] arry=new int[100];
  
   Scanner sc= new Scanner(fp); // to read file
  
  
  
   for(int i=0;i<100;i++)  
   {
      
      
arry[i] =rand.nextInt(75) + 1; // read into array

  
   }
  
  
   // to find sum
   int sum=0;
   for(int i: arry)
       sum=sum+i;
  
   System.out.println("Sum is : "+sum);
  
   float avg=(float)sum/100;
   System.out.println("The average is : "+avg);
  
   // to sort array
   Arrays.sort(arry);
  
   System.out.println("The sorted numbers are : ");
  
   for(int i:arry)
       System.out.println(i);
  
}
  
}

FIle:

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