What do preconditions describe? What do postconditions describe? Do all methods have pre- and postconditions? How do pre- and postconditions relate to code for error handling?
What will be an ideal response?
Preconditions describe the things that must be true before a method is called.
Postconditions describe what will be true after the method finishes executing.
Not all methods have pre- and postconditions.
Pre- and postconditions need to be determined before code for error handling can be written. If a caller does not meet the preconditions, the method probably will not meet the postconditions. Exceptions can be used to enforce preconditions.
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