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‎8 File Handling/File_Handling.java

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/*AARTI RATHI
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My website - https://aartirathi17.herokuapp.com/ */
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/*Problem Statement :
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Implement a program for maintaining a database of student records using Files.Student has Student_id,name, Roll_no, Class, marks and address. Display the data for few students.
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1. Create Database
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2. Display Database
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3. Delete Records
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4. Update Record
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5. Search Record */
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----------------------------------------------------------------------------------------------------------------
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package assign8
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import java.io.*;
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import java.io.File;
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import java.util.*;
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public class Student
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{
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static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
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public void addRecords() throws IOException
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{
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// Create or Modify a file for Database
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PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter("st.txt",true)));
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String studentname, address, stu_class;
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int studentid, rollno;
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float marks;
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String s;
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boolean addMore = false;
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// Read Data
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do
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{
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System.out.print("Enter Student's Name: ");
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studentname = br.readLine();
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System.out.print("Enter Student Id: ");
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studentid = Integer.parseInt(br.readLine());
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System.out.print("Enter Roll no: ");
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rollno = Integer.parseInt(br.readLine());
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System.out.print("Enter Address: ");
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address = br.readLine();
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System.out.print("Enter Class: ");
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stu_class = br.readLine();
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System.out.print("Enter Marks : ");
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marks = Float.parseFloat(br.readLine());
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// Print to File
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pw.println(studentname+" "+studentid+" "+rollno+" "+address+" "+stu_class+" "+marks);
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System.out.print("\nRecords added successfully !\n\nDo you want to add more records ? (y/n) : ");
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s = br.readLine();
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if(s.equalsIgnoreCase("y"))
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{
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addMore = true;
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System.out.println();
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}
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else
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addMore = false;
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}
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while(addMore);
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pw.close();
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}
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public void readRecords() throws IOException
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{
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try
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{
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// Open the file
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BufferedReader file = new BufferedReader(new FileReader("st.txt"));
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String name;
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int i=1;
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// Read records from the file
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while((name = file.readLine()) != null)
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{
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System.out.println(name);
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System.out.println("");
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}
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file.close();
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}
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catch(FileNotFoundException e)
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{
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System.out.println("\nERROR : File not Found !!!");
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}
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}
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public void searchRecords() throws IOException
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{
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try
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{
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// Open the file
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BufferedReader file = new BufferedReader(new FileReader("st.txt"));
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String name;
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int flag=0;
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Scanner sc=new Scanner(System.in);
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System.out.print("Enter an id of the student you want to search: ");
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String searchname=sc.next();
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// Read records from the file
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while((name = file.readLine()) != null)
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{
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String[] line = name.split(" ");
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//System.out.println(line[0]);
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if(searchname.equalsIgnoreCase(line[1])){
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System.out.println("Record found");
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System.out.println(name);
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System.out.println("");
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flag=1;
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break;
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}
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}
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if(flag==0)
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System.out.println("Record not found");
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file.close();
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}
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catch(FileNotFoundException e)
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{
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System.out.println("\nERROR : File not Found !!!");
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}
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}
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public void deleteRecords() throws IOException
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{
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try
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{
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// Open the file
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BufferedReader file1 = new BufferedReader(new FileReader("st.txt"));
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PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter("st1.txt",true)));
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String name;
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int flag=0;
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Scanner sc=new Scanner(System.in);
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System.out.print("Enter the name of the student you want to delete: ");
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String searchname=sc.next();
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// Read records from the file
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while((name = file1.readLine()) != null)
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{
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String[] line = name.split(" ");
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//System.out.println(line[0]);
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if(!searchname.equalsIgnoreCase(line[0]))
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{
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pw.println(name);
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flag=0;
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}
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else
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{
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System.out.println("Record found");
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flag=1;
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}
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}
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file1.close();
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pw.close();
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File delName = new File("st.txt");
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File oldName = new File("st1.txt");
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File newName = new File("st.txt");
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if(delName.delete())
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System.out.println("deleted successfully");
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else
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System.out.println("Error");
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if (oldName.renameTo(newName))
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System.out.println("Renamed successfully");
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else
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System.out.println("Error");
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}
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catch(FileNotFoundException e)
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{
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System.out.println("\nERROR : File not Found !!!");
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}
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}
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public void updateRecords() throws IOException
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{
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try
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{
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// Open the file
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BufferedReader file1 = new BufferedReader(new FileReader("st.txt"));
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PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter("st1.txt",true)));
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String name;
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int flag=0;
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Scanner sc=new Scanner(System.in);
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System.out.print("Enter the name of the student you want to update: ");
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String searchname=sc.next();
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// Read records from the file
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while((name = file1.readLine()) != null && flag==0)
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{
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String[] line = name.split(" ");
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//System.out.println(line[0]);
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if(!searchname.equalsIgnoreCase(line[0]))
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{
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pw.println(name);
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flag=0;
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}
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else
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{
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System.out.println("Record found");
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System.out.println("Enter updated marks:");
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Float number = sc.nextFloat();
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pw.println(line[0]+" "+line[1]+" "+line[2]+" "+line[3]+" "+line[4]+" "+number);
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flag=1;
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}
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}
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file1.close();
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pw.close();
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File delName = new File("st.txt");
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File oldName = new File("st1.txt");
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File newName = new File("st.txt");
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if(delName.delete())
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System.out.println("record updated successfully");
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else
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System.out.println("Error");
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if (oldName.renameTo(newName))
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System.out.println("Renamed successfully");
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else
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System.out.println("Error");
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}
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catch(FileNotFoundException e)
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{
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System.out.println("\nERROR : File not Found !!!");
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}
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}
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public void clear(String filename) throws IOException
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{
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// Create a blank file
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PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter(filename)));
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pw.close();
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System.out.println("\nAll Records cleared successfully !");
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}
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public void Menu() throws IOException
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{
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int ch,in;
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System.out.println("");
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do
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{
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System.out.println("[1] Create Database");
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System.out.println("[2] Display Database");
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System.out.println("[3] Clear Database");
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System.out.println("[4] Modify Database");
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System.out.println("[5] Search Database\n");
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System.out.println("Enter your choice(enter 0 if exit)");
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ch = Integer.parseInt(br.readLine());
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System.out.println("");
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if(ch==1)
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{
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addRecords();
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}
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else if(ch==2)
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{
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readRecords();
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}
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else if(ch==3)
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{
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clear("st.txt");
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}
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else if(ch==4)
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{
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System.out.println("[1] DELETE records?\n[2] UPDATE records?");
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in = Integer.parseInt(br.readLine());
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if(in==1)
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{
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deleteRecords();
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}
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else if(in==2)
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{
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updateRecords();
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}
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else
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{
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System.out.println("Wrong Input :( ");
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}
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}
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else if(ch==5)
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{
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searchRecords();
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}
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else if(ch!=0)
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{
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System.out.print("\nINVALID INPUT!!\n");
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}
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}
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while(ch!=0);
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}
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public static void main(String args[]) throws IOException
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{
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Student call = new Student();
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Call.Menu();
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System.out.print("\nOPERATION COMPLETED!!! Thank you :) ");
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}
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}

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