How to call a method in another class in Java?

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You should capitalize names of your classes. After doing that do this in your school class, 

Classroom cls = new Classroom();
cls.setTeacherName(newTeacherName);

Also I’d recommend you use some kind of IDE such as eclipse, which can help you with your code for instance generate getters and setters for you. Ex: right click Source -> Generate getters and setters

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