JAVAI/O

              JAVAI/O

Aim:

            To write a java program to implement the concept of I/O.

Algorithm:

Step1: Start.

Step2: Import the classes util and io.

Step3: Define a class inventory which define the void main().

Step4: Get the item code, no of  items and item cost from the user.

Step5: Using the DataOutputStream class write the item details inside the file invent.dat.

Step6: Using the DataInputStream class retrieve the stored details from the file and calculate the total cost.

Step7: Display the item code, no of  items, cost and total cost in the console.

Step8: Stop.

Program:

import java.util.*;

import java.io.*;

class inventory

{

static DataInputStream din=new DataInputStream(System.in);

static StringTokenizer st;

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

{

DataOutputStream dos= new DataOutputStream(new FileOutputStream("invent.dat"));

System.out.println("enter code number:");

st=new StringTokenizer(din.readLine());

int code= Integer.parseInt(st.nextToken());

System.out.println("enter number of items:");

st=new StringTokenizer(din.readLine());

int items= Integer.parseInt(st.nextToken());

System.out.println("enter cost:");

st=new StringTokenizer(din.readLine());

double cost= new Double(st.nextToken()).doubleValue();

dos.writeInt(code);

dos.writeInt(items);

dos.writeDouble(cost);

dos.close();

DataInputStream dis = new DataInputStream(new FileInputStream("invent.dat"));

int codeNumber = dis.readInt();

int totalItems = dis.readInt();

double itemCost = dis.readDouble();

double totalCost = totalItems * itemCost;

dis.close();

System.out.println();

System.out.println("Code Number:"+ codeNumber);

System.out.println("Item Cost :"+ itemCost);

System.out.println("totalitems :"+ totalItems);

System.out.println("totalcost :"+totalCost);

}

}

Output:

Z:\anitha>javac -d inventory.java

Z:\anitha>java inventory

enter code number:

101

enter number of items:

10

enter cost:

400

Code Number:101

Item Cost :400.0

totalitems :10

totalcost :4000.0