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Single responsibility principle: a class should have only a single responsibility.

Open/closed principle: 'software entities … should be open for extension, but closed for modification'.

Liskov substitution principle: 'objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program', without breaking the Contract. See also: Liskov's substitution principle, Design by Contract , and Design by Contract (in simpler words).

Interface segregation principle: 'many client-specific interfaces are better than one general-purpose interface.'

Dependency inversion principle: one should Depend upon Abstractions. Do not depend upon concretions.

1 comment:

  1. example of dependency inversion is Spring's dependency injection mechanism.