java - 如何在java中编写未经检查的异常？

Question

是否可以在 Java 中编写未经检查的异常？也许告诉编译器在编译时不要检查抛出是个好主意吗？

JVM 如何区分已检查异常和未检查异常？是 JVM 还是 Java 类级别？

Answer 1

未经检查的异常主要是编译器级别的，因为它们在内部以相同的方式被抛出。唯一的区别是它们在代码和方法签名中的明确要求。

您通过继承 RuntimeException 而不是 Exception 创建未经检查的异常。

JLS 11.2 states :

The Java programming language requires that a program contains handlers for checked exceptions which can result from execution of a method or constructor (§8.4.6, §8.8.5). This compile-time checking for the presence of exception handlers is designed to reduce the number of exceptions which are not properly handled. For each checked exception which is a possible result, the throws clause for the method or constructor must mention the class of that exception or one of the superclasses of the class of that exception (§11.2.3).

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The unchecked exception classes (§11.1.1) are exempted from compile-time checking.