Write a program to read item information (id, name, price, qty) in file “item.dat”.

 

Write a program to read item information (id, name, price, qty) in file “item.dat”. Write a menu driven program to perform the following operations using Random access file:

i. Search for a specific item by name. 

ii. Find costliest item. 

ii. Display all items and total cost

Ex5setb1.java

import java.io.*;

import java.util.*;

 

class Ex5setb

{

public static void main(String args[])throws IOException

 {

        int c;

  BufferedReader b=new BufferedReader(new InputStreamReader(System.in));

 String[] part=null;String line=null;

  do

  {

 BufferedReader fr=new BufferedReader(new FileReader("item.dat"));

 int search()

{

while((line=fr.readLine())!=null)

{

a[i]=line;

part=line.split(" ");

if(Integer.parseInt(part[2])>max)

max=Integer.parseInt(part[2]);i++;return i;

}

   System.out.println("Menu :\n"+"1:Search for a item by name\n"+"2:Find costliest item\n"+"3:Display all items and total cost\n4:Exit\n"+"Choice :" );

 int flag=0;

    c=Integer.parseInt(b.readLine());

 

   switch (c)

   {

 

    case 1:

System.out.println("Enter item name to be searched:");

            String tname=b.readLine();

while((line=fr.readLine())!=null)

{

part=line.split(" ");

        if(part[1].equals(tname)){

   flag=1;

   break;

}

}

if(flag==1)

   System.out.println(part[0]+" "+part[1]+" "+part[2]+" "+part[3]);

else

   System.out.println("Name is not in list");

fr.close();

break;

 

    case 2:

int max=0,i=0; String [] a;

int m=search();

System.out.println(a[m]);

}

 

System.out.println(max);

fr.close();

             break;

 

    case 3:

while((line=fr.readLine())!=null)

{

part=line.split(" ");

System.out.println(part[0]+" "+part[1]+" "+part[2]+" "+part[3]+" "+Integer.parseInt(part[2])*Integer.parseInt(part[3]));

}

fr.close();

break;

          default:

            System.out.println("Invalid Option");

   }

  }while(c!=4);

 }

}