Java Encapsulation Concept not clear

Question

This is basic question but still i don\'t understand encapsulation concept . I did\'t understand how can we change the properties of class from other class.because whenever

Answer 1

Do you mean to say that the value of empid should be 10 and empname tom instead of 0 and null, if yes then-:

1)memory to the variables is allocated at run time , and also deallocated after the program is terminated.

2)Hence if you think that once if you give 10 to empid it should always be 10, it is not so , because empid is just a reference to a memory which is storing "10".

3)So by deallocation , i mean that empid is no longer pointing to memory area storing 10, after the program terminates

4)whenever you execute a new program , the empid is now pointing to other memory area , and that memory is allocated the the default value according t the respective datatype,in case of static variable. hence always 0 and null.