These are the data types which are created by coders or programmers, suppose you created a class named ‘ School ‘ and then you created another class named ‘Student’. Now you opened your School named class and created an object named obj or anything else but the point is of which type you want to create the object then you the object creating code like this in School class
Student mukesh=new Student() ;
Now an object is created of which type, Student type in School class….
I hope from this example you may understand about user-defined data types..
