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I would,Design patterns are solutions to general problems that software developers faced during software developments.These solutions were obtained by trail and error by numerous software developers over quite a substantial period of time.
why we use design patterns in java?Ans:-
1.They are reusable in multiple projects.
2.They provide the solution that help to define system architecture.
3.They capture the s/w engineering experiences.
4.They provide transparency to the design of an application.
When should we use design patterns?
Ans:-We must use design patterns during the analysis and requirement phase(SDLC) .Design patterns ease the analysis and requirement phase SDLC by providing info base on prior hands-on experiences.