Java Exception

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Java Exception

　　先贴上一段Exception源码注释

 1 /**
 2  * The class { @code Exception} and its subclasses are a form of
 3  * { @code Throwable} that indicates conditions that a reasonable
 4  * application might want to catch.
 5  *
 6  * The class { @code Exception} and any subclasses that are not also
 7  * subclasses of { @link RuntimeException} are checked
 8  * exceptions.  Checked exceptions need to be declared in a
 9  * method or constructor's { @code throws} clause if they can be thrown
10  * by the execution of the method or constructor and propagate outside
11  * the method or constructor boundary.
12  *
13  * @author  Frank Yellin
14  * @see     java.lang.Error
15  * @jls 11.2 Compile-Time Checking of Exceptions
16  * @since   JDK1.0
17  */

　　第一段能看出Exception与Error的不同，Exception是一个系统想要捕获的东西。（Errors是不应捕获的）

　　异常分为Checked Exception和Unchecked Exception。

　　CheckedException是除了RuntimeException外所有Exception及其子类，UncheckedException是RuntimeExcetion及其子类。

CheckedException需要使用throws处理，而UncheckedException无须使用throws处理。此处的Checked意思是Checked by coder。

UnCheckedException可以由compiler在运行propagate outside the method or constructor boundary,我们就不必处理了，如

IndexOutofBoundException,ArythmeticException。而FileNotFoundException,SqlBadSyntax之类的在编译阶段是没法处理的，因此

我们必须手动处理。

转载于:https://www.cnblogs.com/ennish/p/9505350.html

Java Exception

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