检查断言是否已启用

Question

您可以启用/禁用assert的ClassLoader.

但是如何确定它们是否已经启用？

(我想采用一些代码路径,只有在启用断言的情况下调用JVM时才执行昂贵的检查.)

Answer 1

public static boolean areAssertsEnabled() {
  boolean assertsEnabled = false;
  assert assertsEnabled = true; // Intentional side effect!!!
  return assertsEnabled;
}

Answer 2

boolean assertEnabled = false;

try {
   assert false;
} catch (AssertionError e) {
   assertEnabled = true;
}