For example, the following code contains two assertions:
<source lang="java"> x > 0 and x > 1, and they are indeed true at the indicated points during executionoun</source>

Assertions are used to help specify programs and to reason about program correctness. For example, a precondition — an assertion placed at the beginning of a section of code — determines the set of states under which the code is expected to be executed. A postcondition — placed at the end — describes the expected state at the end of executionoun