TY_BCS_JAVA_SLIP 15_1

Slip 15_1. Write a program to read item information( id, name, price, qty) from the file ‘item.dat’. write a menu driven program to perform the following operations using random access file:

a.       Search for a specific item by name

b.      Find costliest item

c.       Display all items and total cost.

import java.io.*;

import java.util.*;

class item

{

                String name,id;

                int qty;

                double price,total;

                item(String i,String n,String p,String q)

                {

                                name=n;

                                id=i;

                                qty=Integer.parseInt(q);

                                price=Double.parseDouble(p);

                                total=qty*price;

                }

                public    String toString()

                {

                                String s=name+" "+id+" "+qty+" "+price+" "+total;

                                return(s);

                }

                public static void search(item[] arr,int n)throws IOException

                {

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

                                String s=br.readLine();

                                for(int i=0;i<n;i++)

                                {

                                                if(arr[i].name.equals(s)){

                                                                System.out.println(arr[i].toString());return;}

                                }

                                System.out.println("No Records Found");           

                }

                public static void search_cost(item[] arr,int n)

                {

                                double max=0;int c=0;

                                for(int i=0;i<n;i++)

                                {

                                                if(arr[i].price > max){

                                                                c=i;

                                                }

                                }

                                System.out.println(arr[c].toString());

                }

}

class Slip15_1

{

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

                {

                                String s,space=" ";

                                int ch,i;

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

                                System.out.println("Enter no. of records");

                                int n=Integer.parseInt(b.readLine());

                                System.out.println("Enter Records:\n<id><name><price><qty> :");

                                File f = new File ("item.dat");

                                RandomAccessFile rf = new RandomAccessFile (f, "rw");

                                for( i=0;i<n;i++)

                                {

                                                s=b.readLine()+"\n";

                                                rf.writeBytes(s);

                                }

                                rf.close();

                                item it[]=new item[20];

                                RandomAccessFile rf1 = new RandomAccessFile (f, "r");

                                for(i=0;i<n;i++)

                                {

                                                s=rf1.readLine();

                                                StringTokenizer t = new StringTokenizer(s,space);

                                                String id=new String(t.nextToken());

                                                String pname=new String(t.nextToken());

                                                String price=new String(t.nextToken());

                                                String qty=new String(t.nextToken());

                                                it[i]=new item(id,pname,price,qty);

                                }

                                do {

                                                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 :" );

                                                ch=Integer.parseInt(b.readLine());

                                                switch (ch) {

                                                                case 1: System.out.println("Enter item name to be searched:");

                                                                                item.search(it,n);

                                                                                break;

                                                                case 2: System.out.println("Costliest Item :");

                                                                                item.search_cost(it,n);

                                                                                break;

                                                                case 3:  for(i=0;i<n;i++)

                                                                                                 System.out.println(it[i].toString());        

                                                                                 break;

                                                                case 4: break;

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

                                                }

                                }while(ch!=4);

                }

}