Page 622 - ComputerScience_Class_11

Program 28 Write a program to create and search a binary file with name and roll number.

1 import java.io.*;
2 import java.util.*;
3 class StudentBinaryFile
4 {
5 int rollno;
6 String name;
7 void createFile() throws IOException
8 {
DataOutputStream dos = new DataOutputStream(new FileOutputStream("students.
9 dat"));
10 Scanner sc = new Scanner(System.in);
11 char choice = 'y';
12 while (choice == 'y' || choice == 'Y')
13 {
14 System.out.print("Enter roll number: ");
15 rollno = sc.nextInt();
16 sc.nextLine();
17 System.out.print("Enter student name: ");
18 name = sc.nextLine();
19 dos.writeInt(rollno);
20 dos.writeUTF(name);
21 System.out.print("Do you want to add another student? (y/n): ");
22 choice = sc.next().charAt(0);
23 }
24 dos.close();
25 System.out.println("Student records have been written to the file.");
26 }
27 void searchStudent(int rollnoToSearch) throws IOException
28 {
DataInputStream dis = new DataInputStream(new FileInputStream("students.
29 dat"));
30 boolean found = false;
31 while (dis.available() > 0)
32 {
33 int rollno = dis.readInt();
34 String name = dis.readUTF();
35 if (rollno == rollnoToSearch)
36 {

System.out.println("Student found: Roll No: " + rollno + ",
37 Name: " + name);
38 found = true;
39 break;
40 }

620 Touchpad Computer Science (Ver. 3.0)-XI