java - Advantages of library -

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i have 1 java file numbers of functions around 30-40 use commonly, thinking make external library of it.

but want know what advantages of making library except not need import java file, there performance advantage of making library?

libraries , frameworks have these advantages:

  1. reduce size of class files (code can extracted , moved elsewhere don't disturb anyone).
  2. cleaner api since can't leak internal fields
  3. you can test library independent of application. if library good, bug must in app. reduces test , debug time.
  4. you can reuse library in several projects.

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