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没有头绪

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余杰爱生活y

#1 Created at ... [Delete] [Delete and Lock User]

第一次修改，catch 里我写的是IOException类型，编译运行后，IDE 抛出以下异常我才知道构造catch时类型是 NumberFormatException。怎么才能在不编译运行时就知道要 catch哪些类型的异常呢？

Exception in thread "main" java.lang.NumberFormatException: For input string: "x9"

余杰爱生活y

#2 Created at ... [Delete] [Delete and Lock User]

相同问题的同学请看下一章。

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#3 Created at ... [Delete] [Delete and Lock User]

Ctrl+鼠标左键 点击 需要检查异常的方法，里面会有类似于 throws NumberFormatException 可以知道他会抛出NumberFormatException异常

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#4 Created at ... [Delete] [Delete and Lock User]

看源码,或者直接exception

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