Pass Parameters to PreparedStatement in Java JDBC

package com.demo;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class Demo {

    public static void main(String[] args) {
        List<Student> students = findAll();
        if (students == null) {
            System.out.println("Failed");
        } else {
            System.out.println("students: " + students.size());
            for (Student student : students) {
                System.out.println(student.toString());
                System.out.println("==========================");
            }
        }
    }

    private static List<Student> findAll() {
        List<Student> students = new ArrayList<Student>();
        try {
            PreparedStatement preparedStatement = ConnectDB.connection().prepareStatement("select * from student where age >= ? and age <= ? and status = ?");
			preparedStatement.setInt(1, 18);
			preparedStatement.setInt(2, 25);
			preparedStatement.setBoolean(3, true);
            ResultSet resultSet = preparedStatement.executeQuery();
            while (resultSet.next()) {
                Student student = new Student();
                student.setDob(resultSet.getDate("dob"));
                student.setAge(resultSet.getInt("age"));
                student.setId(resultSet.getInt("id"));
                student.setName(resultSet.getString("name"));
                student.setStatus(resultSet.getBoolean("status"));
                students.add(student);
            }
        } catch (Exception e) {
            students = null;
        } finally {
            ConnectDB.disconnect();
        }
        return students;
    }

    public static class Student {

        private int id;
        private String name;
        private int age;
        private boolean status;
        private Date dob;

        public int getId() {
            return id;
        }

        public void setId(int id) {
            this.id = id;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public int getAge() {
            return age;
        }

        public void setAge(int age) {
            this.age = age;
        }

        public boolean isStatus() {
            return status;
        }

        public void setStatus(boolean status) {
            this.status = status;
        }

        public Date getDob() {
            return dob;
        }

        public void setDob(Date dob) {
            this.dob = dob;
        }

        @Override
        public String toString() {
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd/MM/yyyy");
            return "Student [id=" + id + ", name=" + name + ", age=" + age + ", status=" + status + ", dob="
                    + simpleDateFormat.format(dob) + "]";
        }

    }

    public class ConnectDB {

        private static Connection connection;

        public static Connection connection() {
            try {
                Class.forName("com.mysql.cj.jdbc.Driver");
                connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/your_database", "username",
                        "password");
            } catch (Exception e) {
                e.printStackTrace();
                connection = null;
            }
            return connection;
        }

        public static void disconnect() {
            if (connection != null) {
                try {
                    connection.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }

    }

}