The option must be used when running a program in order to see the results of assert statements.

-ea

Explanation:

We can enable or disable assertions in java, by default this assertions are disabled at runtime, but we can use two commands, for example, if we want to enable assertions at various granularities, we can use the -enableassertions, or -ea, switch, if we want to disable at various granularities, is -disableassertions, or -da.