java - 其他人知道这是什么意思吗？

Question

static final boolean $assertionsDisabled = !java/util/TaskQueue.desiredAssertionStatus();

在源文件java.util.TaskQueue.java中看到

Answer 1

引用 6.2.1 Assertion Overhead :

It is useful to understand how the assertion mechanism works to see how assertion statements can affect performance. When the compiler finds an assertion in a class, it adds a generated static final field named $assertionsDisabled to the class. The field is left unassigned (this is legal bytecode). The assertion itself is compiled into a statement of the form:

if ($assertionsDisabled)
  if (!boolean_expression)
    throw new AssertionError(String_expression);