Something confuses me in java

Question

while working with classes and objects in eclipse.
why do i need to make two different classes. i mean is it necessary to make two different classes. can we just do it in one class

Answer 1

its your wish how many classes u want to create & requirements of the program [>=1]
//yes , U can make a program using a single class also

Answer 2

it's just for house keeping.(makes the code more readable and maintainable)

Answer 3

i agree with@gaurav agrawal n farshaad heydari
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