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rushabhkelarushabhkela
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Add Codes
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‎Report/Outputs.pdf

5.46 MB
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‎Report/Questions.pdf

84.4 KB
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‎Solutions/Bonus/AppJDBC.java

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import java.util.Scanner;
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import java.sql.*;
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class StudentVIT {
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String name;
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String password;
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String school;
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int marks;
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void getDetails() {
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Scanner sc = new Scanner(System.in);
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System.out.print("Enter your name: ");
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name = sc.nextLine();
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System.out.print("Enter your password: ");
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password = sc.nextLine();
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System.out.println("Enter School: ");
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school = sc.nextLine();
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System.out.println("Enter marks");
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marks = sc.nextInt();
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}
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void insertRecord() throws SQLException, InstantiationException, IllegalAccessException, ClassNotFoundException {
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try {
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DatabaseConn dbms = new DatabaseConn("jdbc://mysql://localhost:3306/vit", "root", "");
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Connection conn = dbms.getConnection();
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String sql = "INSERT INTO student VALUES (?,?,?,?)";
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PreparedStatement stmt = conn.prepareStatement(sql);
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stmt.setString(1, name);
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stmt.setString(2, password);
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stmt.setString(3, school);
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stmt.setInt(4, marks);
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stmt.execute();
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System.out.println("Record inserted successfully");
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dbms.closeConnection(conn, stmt);
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}
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catch(Exception e) {
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e.printStackTrace();
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}
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}
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void updateRecord() throws SQLException, InstantiationException, IllegalAccessException, ClassNotFoundException {
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try {
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DatabaseConn dbms = new DatabaseConn("jdbc://mysql://localhost:3306/vit", "root", "");
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Connection conn = dbms.getConnection();
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System.out.println("Enter your name: ");
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Scanner sc = new Scanner(System.in);
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String inputname = sc.nextLine();
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System.out.println("Enter your new password: ");
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String inputpass = sc.nextLine();
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String sql = "UPDATE student SET password = ? WHERE name = ?";
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PreparedStatement stmt = conn.prepareStatement(sql);
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stmt.setString(1, inputname);
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stmt.setString(2, inputpass);
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int i = stmt.executeUpdate();
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if(i>0) {
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System.out.println("Record updated successfully");
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}
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else {
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System.out.println("No such record found in the database");
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}
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dbms.closeConnection(conn, stmt);
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}
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catch(Exception e) {
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e.printStackTrace();
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}
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}
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void deleteRecord() throws SQLException, InstantiationException, IllegalAccessException, ClassNotFoundException {
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try {
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DatabaseConn dbms = new DatabaseConn("jdbc://mysql://localhost:3306/vit", "root", "");
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Connection conn = dbms.getConnection();
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System.out.println("Enter name to be deleted: ");
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Scanner sc = new Scanner(System.in);
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String inputname = sc.nextLine();
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String sql = "DELETE FROM student WHERE name = ?";
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PreparedStatement stmt = conn.prepareStatement(sql);
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stmt.setString(1, inputname);
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int i = stmt.executeUpdate();
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if(i>0) {
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System.out.println("Record deleted successfully");
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}
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else {
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System.out.println("No such record found in the database");
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}
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dbms.closeConnection(conn, stmt);
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}
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catch(Exception e) {
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e.printStackTrace();
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}
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}
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void searchRecord() throws SQLException, InstantiationException, IllegalAccessException, ClassNotFoundException {
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try {
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DatabaseConn dbms = new DatabaseConn("jdbc://mysql://localhost:3306/vit", "root", "");
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Connection conn = dbms.getConnection();
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System.out.println("Enter name to be searched: ");
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Scanner sc = new Scanner(System.in);
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String inputname = sc.nextLine();
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String sql = "SELECT * FROM student WHERE name = ?";
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PreparedStatement stmt = conn.prepareStatement(sql, ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);
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stmt.setString(1, inputname);
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ResultSet rs = stmt.executeQuery();
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if(rs.next() == false) {
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System.out.println("No such record found in the database");
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}
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else {
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rs.previous();
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while(rs.next()) {
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System.out.println("Name: " + rs.getString(1));
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System.out.println("Password: " + rs.getString(2));
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System.out.println("School: " + rs.getString(3));
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System.out.println("Marks: " + rs.getString(4));
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}
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}
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dbms.closeConnection(conn, stmt);
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}
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catch(Exception e) {
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e.printStackTrace();
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}
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}
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}
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class DatabaseConn {
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String url;
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String username;
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String password;
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DatabaseConn(String url, String username, String password) {
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this.url = url;
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this.username = username;
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this.password = password;
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}
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public Connection getConnection() throws InstantiationException, IllegalAccessException, ClassNotFoundException, SQLException {
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Connection conn = null;
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Class.forName("com.mysql.kela.jdbc.Driver").newInstance();
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conn = DriverManager.getConnection(url, username, password);
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System.out.println("Connection is established");
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return conn;
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}
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public void closeConnection(Connection conn, Statement stmt) throws SQLException {
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stmt.close();
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conn.close();
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}
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}
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public class AppJDBC {
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public static void main(String[] args) {
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Scanner sc = new Scanner(System.in);
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int ch;
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try {
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do {
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System.out.println("Select a choice.\n1. Enter Student Details\n2. Update Password\n3. Delete Student\n4. Search Record\n5. Exit");
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ch = 0;
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StudentVIT s = new StudentVIT();
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System.out.print("Enter choice: ");
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ch = sc.nextInt();
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switch(ch)
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{
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case 1:
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s.getDetails();
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s.insertRecord();
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break;
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case 2:
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s.updateRecord();
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break;
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case 3:
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s.deleteRecord();
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break;
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case 4:
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s.searchRecord();
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break;
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case 5:
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System.out.println("Exiting..");
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break;
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default:
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System.out.println("Please select the correct option.");
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break;
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}
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}while(ch!=5);
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}
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catch(Exception e) {
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e.printStackTrace();
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}
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}
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}

‎Solutions/Bonus/BONUS.md

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# Bonus Question - JDBC Concept
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The code in the file `AppJDBC.java` is based on the JDBC concepts in Java Programming. JDBC stands for Java Database Connectivity. JDBC is a Java API to connect and execute the query with the database. It is a part of JavaSE (Java Standard Edition). JDBC API uses JDBC drivers to connect with the database.
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This JDBC sample code is related CRUD operations using SQL database.
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It allows users to :
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* Get Input of students
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* Insert Records into the database
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* Update Records
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* Delete Records
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* Search Records

‎Solutions/Question 1/DistrictVaccine.java

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import java.util.*;
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import java.io.*;
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import java.lang.*;
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public class DistrictVaccine {
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public static void main(String[] args) {
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Scanner sc = new Scanner(System.in);
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int n,i,j,k,p;
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System.out.println("Maharashtra COVID-19 Vaccination Drive");
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System.out.print("Enter the number of districts: ");
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n = sc.nextInt();
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String[] district = new String[n];
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int[][] centres = new int[n][];
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boolean[] free = new boolean[n];
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int[] left = new int[n];
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System.out.println("\nEnter the details of each district: ");
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for(i=0;i<n;i++)
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{
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free[i] = false;
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System.out.println("\nDistrict " + (i+1));
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System.out.print("Enter Name: ");
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district[i] = sc.next();
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System.out.print("Enter number of vaccination centres: ");
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k = sc.nextInt();
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System.out.print("Enter number of people registered: ");
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p = sc.nextInt();
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centres[i] = new int[k];
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for(j=0;j<k;j++)
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{
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if(p > 40) {
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centres[i][j] = 40;
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p -= 40;
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}
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else if (p > 0) {
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centres[i][j] = p;
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p -= p;
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}
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else {
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centres[i][j] = 0;
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free[i] = true;
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}
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}
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left[i] = p;
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}
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// Traversing the jagged array using foreach loop
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System.out.println();
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k = 0;
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for (int[] cv : centres) {
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System.out.print(district[k++] + ": ");
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for (int num : cv) {
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System.out.print(num + " ");
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}
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System.out.println();
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}
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// Printing the districts where all people were not able to vaccinate
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k=0;
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for (int[] cv : centres) {
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if(left[k] != 0) {
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System.out.println("Only " + 40*cv.length + " people were able to vaccinate in " + district[k] + " and " + left[k] + " people were left.");
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}
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k++;
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}
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// Districts with free centres
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k=0;
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for (int[] cv : centres) {
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int cnt = 0;
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if(free[k]) {
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for (int num : cv) {
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if(num != 0) {
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cnt++;
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}
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}
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System.out.println(district[k] + " had " + cnt + " centres free on that day.");
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}
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k++;
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}
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}
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}

‎Solutions/Question 10/Generics.java

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import java.io.*;
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import java.util.*;
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import java.lang.*;
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public class Generics {
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public static < E > boolean isPalindrome(E str) {
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int i;
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String s = str.toString();
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StringBuilder sb = new StringBuilder();
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sb.append(s);
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sb.reverse();
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if(sb.toString().equals(s)) {
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return true;
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}
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return false;
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}
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public static < E > boolean isPrime(E str) {
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int i;
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int n = Integer.parseInt(str.toString());
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for(i = 2; i < n; i++) {
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if(n%i == 0) {
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return false;
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}
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}
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return true;
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}
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public static < E > E[] changeArray(E[] arr) {
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int n = arr.length, i;
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if(arr instanceof String[])
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{
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System.out.println("\nReversing all the non - palindrome strings in array: ");
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for(i = 0; i < n; i++)
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{
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if(!isPalindrome(arr[i])) {
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StringBuilder sb = new StringBuilder();
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sb.append(arr[i].toString());
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sb.reverse();
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arr[i] = (E)sb.toString();
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}
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else {
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StringBuilder sb = new StringBuilder();
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sb.append(arr[i].toString());
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sb.append("*");
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arr[i] = (E)sb.toString();
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}
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}
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return arr;
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}
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if(arr instanceof Integer[])
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{
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System.out.println("\nReplacing all prime numbers in the array with their squares: ");
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for(i = 0; i < n; i++)
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{
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if(isPrime(arr[i])) {
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int m = Integer.parseInt(arr[i].toString());
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Integer sq = new Integer((int)Math.pow(m,2));
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arr[i] = (E)sq;
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}
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}
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return arr;
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}
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return arr;
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}
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public static void main(String[] args) {
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System.out.println("GENERIC METHODS");
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Integer[] intArray = {20, 11, 78, 23, 89};
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String[] strArray = {"rushabh", "wow", "abba", "kela"};
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System.out.println("Original Integer Array: ");
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for(int i : intArray) {
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System.out.print(i + " ");
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}
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Integer[] changedIntArray = changeArray(intArray);
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System.out.println("Changed Integer Array: ");
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for(int i : changedIntArray) {
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System.out.print(i + " ");
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}
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System.out.println("\n");
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System.out.println("Original String Array: ");
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for(String str : strArray) {
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System.out.print(str + " ");
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}
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String[] changedStrArray = changeArray(strArray);
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System.out.println("Changed String Array: ");
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for(String str : changedStrArray) {
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System.out.print(str + " ");
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}
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System.out.println("\n");
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}
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}

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