Problems with SQLite [closed]

Good afternoon, I just try to translate and know what the example codes say in order to better understand how everything works, and get stuck in this fregmentom, it is part of a code for a database with multi table in android studio , the code is the following ..

(I take everything out of this exercise link and my intention is to learn to do multitablas database in sqlite for android studio UU)

I want to know what it does or what it means and how the line is read, which is the getSimpleName(); ?

public static final String TAG = Course.class.getSimpleName();

in this class

package com.instinctcoder.sqlitedbmultitbl.data.model;

/**
* Created by Tan on 1/26/2016.
*/
public class Course {

public static final String TAG = Course.class.getSimpleName();
public static final String TABLE = "Course";
// Labels Table Columns names
public static final String KEY_CourseId = "CourseId";
public static final String KEY_Name = "Name";

private String courseId;
private String name;


public String getCourseId() {
    return courseId;
}

public void setCourseId(String courseId) {
    this.courseId = courseId;
}

public String getName() {
    return name;
}

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

and then ... in this block I do not know the guys " data.repo " who then uses them as ...

    db.execSQL(CourseRepo.createTable());
    db.execSQL(StudentRepo.createTable());
    db.execSQL(MajorRepo.createTable());
    db.execSQL(StudentCourseRepo.createTable());

in the class ..

package com.instinctcoder.sqlitedbmultitbl.data;

/**
 * Created by Tan on 1/26/2016.
 */
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

import com.instinctcoder.sqlitedbmultitbl.app.App;
import com.instinctcoder.sqlitedbmultitbl.data.model.Course;
import com.instinctcoder.sqlitedbmultitbl.data.model.Major;
import com.instinctcoder.sqlitedbmultitbl.data.model.Student;
import com.instinctcoder.sqlitedbmultitbl.data.model.StudentCourse;
import com.instinctcoder.sqlitedbmultitbl.data.repo.CourseRepo;
import com.instinctcoder.sqlitedbmultitbl.data.repo.MajorRepo;
import com.instinctcoder.sqlitedbmultitbl.data.repo.StudentCourseRepo;
import com.instinctcoder.sqlitedbmultitbl.data.repo.StudentRepo;


public class DBHelper  extends SQLiteOpenHelper {
//version number to upgrade database version
//each time if you Add, Edit table, you need to change the
//version number.
private static final int DATABASE_VERSION =8;
// Database Name
private static final String DATABASE_NAME = "sqliteDBMultiTbl.db";
private static final String TAG = DBHelper.class.getSimpleName().toString();

public DBHelper( ) {
    super(App.getContext(), DATABASE_NAME, null, DATABASE_VERSION);
}

@Override
public void onCreate(SQLiteDatabase db) {
    //All necessary tables you like to create will create here
    db.execSQL(CourseRepo.createTable());
    db.execSQL(StudentRepo.createTable());
    db.execSQL(MajorRepo.createTable());
    db.execSQL(StudentCourseRepo.createTable());
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    Log.d(TAG, String.format("SQLiteDatabase.onUpgrade(%d -> %d)", oldVersion, newVersion));

    // Drop table if existed, all data will be gone!!!
    db.execSQL("DROP TABLE IF EXISTS " + Course.TABLE);
    db.execSQL("DROP TABLE IF EXISTS " + Student.TABLE);
    db.execSQL("DROP TABLE IF EXISTS " + Major.TABLE);
    db.execSQL("DROP TABLE IF EXISTS " + StudentCourse.TABLE);
    onCreate(db);
}

}