java - 在 Java 中抛出自定义异常

Question

为什么我需要在尝试抛出自定义异常时用 try/catch 包装我抛出的自定义异常，但对于一般异常我不必这样做？就像在示例中一样，我的 Exception 子类:

public class MyException extends Exception {
    public MyException(String msg) {
        super(msg);
    }
}

抛出异常:

public class Exe {

    private static void testex(String test) {
        if (null!=test) {
            throw new UnsupportedAddressTypeException();
        } else {//Removing try/catch block results in compile failure
          try {
            throw new MyException("message");
          } catch (MyException e) {
            e.printStackTrace();
          }
        }
    }
}

Answer 1

UnsupportedAddressTypeException 是 RuntimeException 的子类，来自 JavaDoc:

RuntimeException is the superclass of those exceptions that can be thrown during the normal operation of the Java Virtual Machine.

A method is not required to declare in its throws clause any subclasses of RuntimeException that might be thrown during the execution of the method but not caught.