Question

Create a JAVA program with an array with the following data: 50 12 31 76 5 23 15 Use a text file (.txt created in notepad) to read the data into the array. Write a sort method (your choice of sorting algorithm) to sort the array values values - FROM HIGHEST TO LOWEST. Write a method to determine the minimum value. Your program should call the sort and minimum methods. Output the sorted array and minimum value.

Answer 1

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

public class SortAndMin {
  
private static final String FILENAME = "input.txt";
  
public static void main(String[]args)
{
Scanner fileReader;
int nNumbers = 0;
  
// new int array of quiet a large size
int arr[] = new int[100];
  
// all values in the array is initialized to -1
Arrays.fill(arr, -1);
  
// reads the numbers one-by-one from input.txt file and inserts them to the array
try
{
fileReader = new Scanner(new File(FILENAME));
while(fileReader.hasNextInt())
{
arr[nNumbers++] = fileReader.nextInt();
}
fileReader.close();
}catch(FileNotFoundException fnfe){
System.out.println("Could not find file: " + FILENAME);
}
  
// calling the sort(..) method to print the sorted array
int[] sortedArr = sort(arr, nNumbers);
System.out.print("The sorted numbers are: ");
for(int i = 0; i < nNumbers; i++)
{
if(i == nNumbers - 1)
System.out.println(sortedArr[i]);
else
System.out.print(sortedArr[i] + " ");
}
  
// calling the findMinimum(..) method to print the minimum value in the array
System.out.println("\nThe minimum value is " + findMinimum(arr, nNumbers) + "\n");
}
  
/**
* Sorts an array from highest to lowest value
*
* @param arr the array to be sorted
* @param size the size of the given array
*
* @return the sorted array
*/
private static int[] sort(int[] arr, int size)
{
int temp = 0;
for(int i = 0; i < size; i++)
{
for(int j = 1; j < (size - i); j++)
{
if(arr[j] > arr[j - 1])
{
temp = arr[j];
arr[j] = arr[j - 1];
arr[j - 1] = temp;
}
}
}
return arr;
}
  
/**
* Finds the minimum value from an array
*
* @param arr the array from which the minimum needs to be found
* @param size the size of the given array
*
* @return the minimum value from the array
*/
private static int findMinimum(int[] arr, int size)
{
int min = arr[0];
for(int i = 0; i < size; i++)
{
if(arr[i] < min)
min = arr[i];
}
return min;
}
}

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