try - catch - finally使用总结

最新推荐文章于 2025-05-14 09:30:00 发布

沙洲惊鸿

最新推荐文章于 2025-05-14 09:30:00 发布

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分类专栏： Java 文章标签： Java Exception

本文链接：https://blog.youkuaiyun.com/magnificent_tony/article/details/40296105

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这篇文章对try-catch-finally语句块和return语句配合使用的所有情形应用排列组合的方式进行了总结，其中可以正常使用的十种情形以下划线标出，不考虑包含throw语句的情形。

try { return; } catch() { } 编译报错 This method must return a result
try { } catch() { return; } 编译报错 This method must return a result
try { } catch() { } return; 执行return

try { return; } catch() { return; } 无异常时执行try return，有异常时执行catch return
try { return; } catch() { } return; 无异常时执行try return，有异常时执行return
try { } catch() { return; } return; 无异常时执行return，有异常时执行catch return

try { return; } catch() { return; } return; 编译报错 Unreachable Code

try { return; } finally { } 无异常时执行try return，有异常时抛出异常
try { } finally { return; } 执行finally return，编译提示 finally block does not complete normally
try { } finally { } return; 无异常时执行return，有异常时抛出异常

try { return; } finally { return; } 无异常时计算try return，计算并执行finally return，有异常时执行finally return，编译提示 finally block does not complete normally
try { return; } finally { } return; 编译报错 Unreachable Code
try { } finally { return; } return; 编译报错 Unreachable Code

try { return; } finally { return; } return; 编译报错 Unreachable Code，编译提示 finally block does not complete normally

try { return; } catch() { } finally { } 编译报错 This method must return a result
try { } catch() { return; } finally { } 编译报错 This method must return a result
try { } catch() { } finally { return; } 执行finally return，编译提示 finally block does not complete normally
try { } catch() { } finally { } return; 执行return

try { return; } catch() { return; } finally { } 无异常时执行try return，有异常时执行catch return
try { return; } catch() { } finally { return; } 无异常时计算try return，计算并执行finally return，有异常时执行finally return，编译提示 finally block does not complete normally
try { return; } catch() { } finally { } return; 无异常时执行try return，有异常时执行return
try { } catch() { return; } finally { return; } 无异常时执行finally return，有异常时计算catch return，执行finally return，编译提示 finally block does not complete normally
try { } catch() { return; } finally { } return; 无异常时执行return，有异常时执行catch return
try { } catch() { } finally { return; } return; 编译报错 Unreachable Code，编译提示 finally block does not complete normally

try { return; } catch() { return; } finally { return; } 无异常时计算try return，计算并执行finally return，有异常时计算catch return，计算并执行finally return，编译提示 finally block does not complete normally
try { return; } catch() { return; } finally { } return; 编译报错 Unreachable Code
try { return; } catch() { } finally { return; }return; 编译报错 Unreachable Code，编译提示 finally block does not complete normally
try { } catch() { return; } finally { return; }return; 编译报错 Unreachable Code，编译提示 finally block does not complete normally

try { return; } catch() { return; } finally { return; }return; 编译报错 Unreachable Code，编译提示 finally block does not complete normally