Small School Management Application using files instead DB

Introduction:
1. Add any student info(marks)
2. Get any student info using student ID
3. View student grade
4. View student status
5. View class topper info

Note: This application never use DB for data storage, it uses files to store info

Source Code:

<br /> <br /> import java.awt.*;<br /> import java.io.*;<br /> import java.util.*;<br /> import javax.swing.*;<br /> import javax.swing.event.*;<br /> import java.awt.event.*;<br /> <br /> public class ProjectX extends JFrame implements ChangeListener,<br /> ActionListener<br /> {<br /> static int choice = 0;<br /> static String line = "---";<br /> DataInputStream inputData = new DataInputStream(System.in);<br /> private Registration studentDetails = new Registration();<br /> int topScore = studentDetails.getTopScore();<br /> int passMarks = studentDetails.getPassMarks();<br /> int firstClass = studentDetails.getFirstClass();<br /> int secondClass = studentDetails.getSecondClass();<br /> <br /> JTabbedPane tabbedPane = new JTabbedPane();<br /> JLabel statusLabel = new JLabel();<br /> JLabel titleLabel = new JLabel("Small School Management System");<br /> JPanel addStudentPanel = new JPanel();<br /> JTextField studentName = new JTextField();<br /> JTextField physicsMarks = new JTextField();<br /> JTextField biologyMarks = new JTextField();<br /> JTextField mathsMarks = new JTextField();<br /> JButton submitDetails = new JButton("Submit Details");<br /> JPanel studentDetailsPanel = new JPanel();<br /> JTextField studentID1 = new JTextField();<br /> JTextArea studentInfo = new JTextArea();<br /> JButton submitID1 = new JButton("Submit ID");<br /> JPanel studentGradePanel = new JPanel();<br /> JTextField studentID2 = new JTextField();<br /> JTextArea studentGrade = new JTextArea();<br /> JButton submitID2 = new JButton("Submit ID");<br /> JPanel numberPassedPanel = new JPanel();<br /> JTextArea studentPassed = new JTextArea();<br /> JPanel classTopperPanel = new JPanel();<br /> JTextArea studentTopper = new JTextArea();<br /> <br /> public ProjectX(String frameTitle)<br /> {<br /> super(frameTitle);<br /> setResizable(false);<br /> setSize(400,400);<br /> submitDetails.addActionListener(this);<br /> submitID1.addActionListener(this);<br /> submitID2.addActionListener(this);<br /> <br /> getContentPane().setLayout(new BorderLayout());<br /> <br /> getContentPane().add(titleLabel,"North");<br /> <br /> tabbedPane.addTab("Add Student",addStudentPanel);<br /> addStudentPanel.setLayout(new GridLayout(8,2,5,5));<br /> addStudentPanel.add(new JLabel("Student Name: "));<br /> addStudentPanel.add(studentName);<br /> addStudentPanel.add(new JLabel("Physics Marks: "));<br /> addStudentPanel.add(physicsMarks);<br /> addStudentPanel.add(new JLabel("Biology Marks: "));<br /> addStudentPanel.add(biologyMarks);<br /> addStudentPanel.add(new JLabel("Maths Marks: "));<br /> addStudentPanel.add(mathsMarks);<br /> addStudentPanel.add(submitDetails);<br /> <br /> tabbedPane.addTab("Student Details",studentDetailsPanel);<br /> studentDetailsPanel.setLayout(new GridLayout(0,1,5,5));<br /> studentDetailsPanel.add(new JLabel("Enter Student ID: "));<br /> studentDetailsPanel.add(studentID1);<br /> studentDetailsPanel.add(submitID1);<br /> studentDetailsPanel.add(new JLabel("Student Details:"));<br /> studentDetailsPanel.add(studentInfo);<br /> <br /> tabbedPane.addTab("Student Grade",studentGradePanel);<br /> studentGradePanel.setLayout(new GridLayout(5,2,5,5));<br /> studentGradePanel.add(new JLabel("Enter Student ID: "));<br /> studentGradePanel.add(studentID2);<br /> studentGradePanel.add(submitID2);<br /> studentGradePanel.add(new JLabel("Student Grade:"));<br /> studentGradePanel.add(studentGrade);<br /> <br /> tabbedPane.addTab("Passed Student",numberPassedPanel);<br /> numberPassedPanel.setLayout(new GridLayout(2,2,5,5));<br /> numberPassedPanel.add(new JLabel("Number of Student Passed: "));<br /> numberPassedPanel.add(studentPassed);<br /> <br /> tabbedPane.addTab("Class Topper",classTopperPanel);<br /> classTopperPanel.setLayout(new GridLayout(2,2,5,5));<br /> classTopperPanel.add(new JLabel("Here are the class Toppers: "));<br /> classTopperPanel.add(studentTopper);<br /> <br /> tabbedPane.addChangeListener(this);<br /> getContentPane().add(tabbedPane,"Center");<br /> <br /> statusLabel.setText("Status: Normal");<br /> getContentPane().add(statusLabel,"South");<br /> <br /> setVisible(true);<br /> <br /> }<br /> <br /> public static void main(String args[])<br /> {<br /> ProjectX outputScreen = new ProjectX("Case Study");<br /> }<br /> <br /> public String setStudentInfo()<br /> {<br /> int id = studentDetails.addStudent(studentName.getText(),<br /> Integer.parseInt(physicsMarks.getText()),<br /> Integer.parseInt(biologyMarks.getText()),<br /> Integer.parseInt(mathsMarks.getText()));<br /> return ( " "+line+" Record Created For " + studentName +" "+ "Student ID: " + id + " " + line);<br /> }<br /> <br /> public String getStudentInfo()<br /> {<br /> int id = Integer.parseInt(studentID1.getText());<br /> if(studentDetails.getStudentDetails(id))<br /> return (line +"Student ID: " + id + "\n" + "Student Name: " + studentDetails.studentName + "\t" + "Physics Marks: " + studentDetails.physicsMarks + "\n" + "Biology Marks: " + studentDetails.biologyMarks + "\t" + "Maths Marks: " + studentDetails.mathsMarks + line );<br /> else<br /> return(" Records Not Found for ID " + id);<br /> }<br /> <br /> public String getStudentGrade()<br /> {<br /> int id = Integer.parseInt(studentID2.getText());<br /> studentDetails.getStudentDetails(id);<br /> String grade;<br /> if(studentDetails.studentName == null)<br /> {<br /> System.out.println(" Records Not Found for ID " + id);<br /> return null;<br /> }<br /> if(studentDetails.physicsMarks < passMarks || studentDetails.biologyMarks < passMarks || studentDetails.mathsMarks < passMarks) { grade = "Failed"; } else { int avgMarks = (studentDetails.physicsMarks + studentDetails.biologyMarks + studentDetails.mathsMarks)/3; if(avgMarks >= passMarks && avgMarks < secondClass) grade = "Pass Class"; else if(avgMarks >= secondClass && avgMarks < firstClass) grade = "Second Class"; else if(avgMarks >= firstClass && avgMarks < topScore) grade = "First Class"; else grade = "Distinction"; } return(line + "Grade For " + studentDetails.studentName + " is " + grade+ " " + line + "\n"); } public String getNumberPasses() { int lastID = Registration.getNextID() -1; boolean passed = true; int numberPassed = 0; for(int id = 1; id <= lastID; id++) { studentDetails.getStudentDetails(id); if(studentDetails.physicsMarks >= passMarks &&<br /> studentDetails.biologyMarks >= passMarks && studentDetails.mathsMarks >=<br /> passMarks) numberPassed++;<br /> }<br /> return(line + "Number of Student Passed: " + numberPassed + "" +line);<br /> }<br /> <br /> public String getClassTopper()<br /> {<br /> int lastID = Registration.getNextID() -1;<br /> String classTopper;<br /> StringBuffer buffer = new StringBuffer(500);<br /> int topMarks = 0;<br /> for(int id = 1; id <= lastID; id++) { studentDetails.getStudentDetails(id); int studentMarks = studentDetails.physicsMarks + studentDetails.biologyMarks + studentDetails.mathsMarks; if(studentMarks > topMarks) topMarks = studentMarks;<br /> }<br /> buffer.append(line + "Student Having Top Marks: \n");<br /> for(int id = 1; id <= lastID; id++) { studentDetails.getStudentDetails(id); int studentMarks = studentDetails.physicsMarks + studentDetails.biologyMarks + studentDetails.mathsMarks; if(studentMarks == topMarks) { buffer.append(studentDetails.studentName + " Having Total Marks: " +topMarks + ""); } } buffer.append(line + "\n"); return(buffer.toString()); } public void stateChanged(ChangeEvent e) { switch(tabbedPane.getSelectedIndex()) { case 3: studentPassed.setText(getNumberPasses()); break; case 4: studentTopper.setText(getClassTopper()); break; } } public void actionPerformed(ActionEvent e) { if(e.getSource() == submitID1) { studentInfo.setText(getStudentInfo()); } else if(e.getSource() == submitID2) { studentGrade.setText(getStudentGrade()); } if(e.getSource() == submitDetails) { setStudentInfo(); } } } //Registration Class class Registration { private int topScore = 90; private int passMarks = 35; private int firstClass = 65; private int secondClass = 45; private static String idFile = "id.dat"; private static String studentFile = "studentfile.dat"; public int id; public String studentName; public int physicsMarks; public int biologyMarks; public int mathsMarks; public int addStudent(String studentName, int physicsMarks, int biologyMarks, int mathsMarks) { int id = 0; try { FileWriter fileOutput = new FileWriter(Registration.studentFile,true); id = Registration.getNextID(); String buffer = id + "|" + studentName + "|" + physicsMarks + "|" + biologyMarks + "|" + mathsMarks + "\n"; fileOutput.write(buffer); fileOutput.close(); Registration.setID(id); } catch(IOException e) { System.err.println(e.toString()); System.exit(1); } return id; } //Function to get the details of a student given the ID public boolean getStudentDetails(int id) { try { FileReader fileInput = new FileReader(Registration.studentFile); BufferedReader br = new BufferedReader(fileInput); { String str; while((str = br.readLine()) != null) { StringTokenizer fields = new StringTokenizer(str,"|"); if(Integer.parseInt(fields.nextToken()) == id) { this.id = id; this.studentName = fields.nextToken(); this.physicsMarks = Integer.parseInt(fields.nextToken()); this.biologyMarks = Integer.parseInt(fields.nextToken()); this.mathsMarks = Integer.parseInt(fields.nextToken()); return true; } } } } catch(IOException e) { System.err.println(e.toString()); System.exit(1); } return false; } public int getTopScore() { return topScore; } public int getPassMarks() { return passMarks; } public int getFirstClass() { return firstClass; } public int getSecondClass() { return secondClass; } //Function to get the next ID available public static int getNextID() { int id = 0; try { RandomAccessFile studentIDFile = new RandomAccessFile(Registration.idFile,"rw"); if(studentIDFile.length() == 0) { id = 0; } else id = studentIDFile.readInt(); id++; studentIDFile.close(); } catch(IOException e) { System.err.println(e.toString()); System.exit(1); } return id; } //Function to Store current ID in a file public static void setID(int id) { try { RandomAccessFile studentIDFile = new RandomAccessFile(Registration.idFile,"rw"); studentIDFile.seek(0); studentIDFile.writeInt(id); studentIDFile.close(); } catch(IOException e) { System.err.println(e.toString()); System.exit(1); } } }

Output: