Item Design method signatures carefully

Careful choice of method names:

• Names must follow conventions (Item 68).
• Prioritize names that are understandable and consistent with the package and general consensus.
• Avoid long names.

Do not exaggerate in convenience methods:

• Each method must “do its part of the work”.
• Many methods make the API difficult to use, maintain, and document.
• Offer abbreviated methods only if they are frequently used.

Avoid long parameter lists:

• Limit to four or fewer parameters.
• Long lists are difficult to remember and prone to errors.
• Parameters of the same type in sequence can cause confusion.

Three techniques to reduce long parameter lists:

• Divide the method into several smaller methods.
• Create helper classes for parameter groups.
• Use the Builder pattern for methods with many parameters, especially optional ones.

Prefer interfaces to classes in parameters:

• Use interfaces such as Map rather than specific classes such as HashMap for greater flexibility.

Prefer enums to booleans in parameters:

• Enums make the code more readable and facilitate future expansion of options, as in the example of the thermometer with a temperature scale.
• These practices help create APIs that are easier to use and less susceptible to errors.

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