Question

Write a Java part code to do the following   :

** Suppose a file called infile stored in drive D: ,filled with five integers(1000,200,3030,40 and 500)

• Read  the integers from infile then store them in array called ar[] and print it elements.
• Method called search( ) to print the location of   value 500.
• Method called sort() to sort array elements.
• Build another file called outfile in drive D: to save the sorted array elements .

  Note : Use ArrayIndexOutOfBoundsException when you use array in one method.

Answer 1

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

public class file
{
   //method to search 500 and return its position in the array
   public static int search(int arr[],int size)
   {
       int i=-1;
       try
       {
       for(i=0;i<size;i++)
           if(arr[i]==500) //compare for 500
               break;
       }
       catch(ArrayIndexOutOfBoundsException e)
       {
               System.out.println("Array out of Bound");
           }
       if(i==size) //if not found then return -1
           return -1;
       else
           return (i+1); //return the position
   }
     
   //method to sort the array
   public static void sort(int arr[],int num)
   {
       int i,j,t;
       //selection sort logic
       try
       {
       for(i=0;i<num;i++)
       {
           for(j=i+1;j<num;j++)
           {
               if(arr[i]>arr[j])
               { //swap
                   t=arr[i];
                   arr[i]=arr[j];
                   arr[j]=t;
               }
           }
       }
       }
       catch(ArrayIndexOutOfBoundsException e)
       {
               System.out.println("Array out of Bound");
           }
   }
  
   public static void main(String[] args) throws Exception
   {
       //declare scanner object to read the file contents
       Scanner scanner = new Scanner(new File("D:\\infile.txt"));
       int n,i;
//declare filewriter object to open the file and write the array contents
FileWriter writer = new FileWriter("D:/outfile.txt");
int arr[] = new int[50]; //declare array with size 50
       i=0;

  
//loop to read the data from file
  
try
{
           while (scanner.hasNext())
           {
               n=scanner.nextInt();//read the numbers
               arr[i]=n; //assign the number into array
               i++;
           }
}
catch(ArrayIndexOutOfBoundsException e)
       {
               System.out.println("Array out of Bound");
           }
          
       int len = i; //assign number of elements read from file
       System.out.print("\nThe array elements : ");
       for(i=0;i<len;i++) //loop to print the array elements
           System.out.print(arr[i]+" ");
       int pos = search(arr,len); //call search() to know the postion of 500
       if(pos==-1)
           System.out.print("\n500 is not in the array");
       else
       System.out.print("\nThe number 500 is at "+ pos + " Position");
       //call top sort() method
       sort(arr,len);
       //loop to write the array elements into file
for (i = 0; i < len; i++) {
writer.write( arr[i] + "\t"+ "");
}
writer.close();//close the files
   scanner.close();
}

}

output