Is there a way in which a string "hello" can be changed into a 'hello' in java (android)?? This is to make my SQL query work. For example

public Cursor GetLecture(String course_code) 
{ 
    SQLiteDatabase sqldb = this.getReadableDatabase(); 
    String query = "SELECT * FROM Lecture WHERE course_code =" + course_code; 
    Cursor C = sqldb.rawQuery(query, null); 
    return C; 
}