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Java

Hello
i was haired in company they put me in training and i make simple app using JDBC to be familiar with how connecting java to mysql no my application is contain 5 class's student,course,teacher,section,main each one of this class's have setter and getter method expect main i should insert data to student table using student object and so on for all tables and objects now here is the code and ready to hear your opinions if there unlogical problems

package com.query;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class Main {
	public Teacher teacher;
	public Course course;
	public Section section;
	public Student student;
	public static Connection connecting;
	public static Statement st;
	public static ResultSet rs;

	public static void main(String[] args) throws Throwable {
		Class.forName("com.mysql.jdbc.Driver");
		connecting = DriverManager.getConnection(
				"jdbc:mysql://localhost/student", "root", "4896558");
		st = connecting.createStatement();
//		st.executeUpdate("insert into student(student_name,gender) values('khalel','male')");
		rs = st.executeQuery("Select * from student ");
		rs = st.executeQuery("Select * from student where idStudent=1");
		Student s1 = new Student();
		while (rs.next()) {
			s1.setId(rs.getInt(1));
			s1.setName(rs.getString(2));
			s1.setGender(rs.getString(3));
			System.out.println(s1.getId() + " " + s1.getName() + " "
					+ s1.getGender());
		}

		Course c1 = new Course();
//		st.executeUpdate("insert into course(course_name)  values('OOP advance')");
		rs = st.executeQuery("select * from course where idCourse=1");
		while (rs.next()) {
			c1.setId(rs.getInt(1));
			c1.setName(rs.getString(2));
			System.out.println(c1.getId() + " " + c1.getName());

		}
		Section s2 = new Section();
//		st.executeUpdate("insert into section1(name,teacherId,courseId) values('History',1,1)");
		rs = st.executeQuery("Select * from section1 where idsection=1 ");
		while (rs.next()) {
			s2.setId(rs.getInt(1));
			s2.setName(rs.getString(2));
			System.out.println(s2.getId() + " " + s2.getName());

		}
		Teacher t1 = new Teacher();
//		st.executeUpdate("insert into teacher (teacher_Name)values ('Amjad')");
		rs = st.executeQuery("Select * from teacher where idteacher=1 ");
		while (rs.next()) {
			t1.setId(rs.getInt(1));
			t1.setName(rs.getString(2));
			System.out.println(t1.getId() + " " + t1.getName());
		}
	}
}