how to call a function from a class java

1public class Classroom {
2	 private String teacherName;
3	
4  	 public Classroom(String teacherName){
5       this.teacherName = teacherName;
6     }
7  
8  	 public String getTeacherName() {
9        return teacherName;
10     } 
11}
12
13public static void main(String[] args){
14	Classroom firstGrade = new Classroom("John");
15    /*Once you type the 'firstGrade.' your IDE most likely 
16	will show all the functions it can acess*/
17    firstGrade.getTeacherName();
18}