Single responsibility, Open-closed, Liskov substitution, Interface segregation and Dependency inversion.
Single responsibility principle
an object 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”. See also design by contract.
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.”
Dependency injection is one method of following this principle.
Single responsibility principle
an object 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”. See also design by contract.
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.”
Dependency injection is one method of following this principle.
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