[英]Java Exception Handling Concept
I had a confusion if I have to handle and test the exception for a class calling another class which handles the Exception. 如果我不得不为调用另一个处理异常的类的类处理和测试异常,我会感到困惑。
Here is a basic explanation for my classes: 这是我的课程的基本说明:
Class A -> Has a method and calls the method that throws exception. 类A->具有一个方法,并调用引发异常的方法。 The exception is handled using try and catch
使用try和catch处理异常
Class B -> calls the method from class A. It doesn't throw any exception now as the exception is handled in class A. 类B->从类A调用该方法。由于该异常是在类A中处理的,因此它现在不会引发任何异常。
I wanted to know if I have to add throws and show that the exception is thrown in class B? 我想知道是否必须添加引发并显示B类中引发了异常吗? Also, do I have to Unit test that the method called in class B throws exception?
另外,是否必须对B类中调用的方法引发异常进行单元测试? When I tried to do that, the test case failed.
当我尝试这样做时,测试用例失败了。
Here is class A that handles the exception: 这是处理异常的类A:
public String getFooData(Foo foo, String foo1, String foo2) {
String foodata = "";
try {
FooRequest request = foo.setFoo1(foo1).setFoo2(foo2).buildQueryMessage();
foodata = request.getFooData();
} catch (SystemException e) {
errorReporter.report(".SystemException", e);
}
}
Here is my class B: 这是我的B类:
public String getFoo(String foo2) {
RequestBuilder requestBuilder = Request.Provider(ProviderType.foo);
String foodata = instanceOfA.getFooData(foo, foo1, foo2);
return foodata;
}
I wanted to know if I have to add throws and show that the exception is thrown in class B?
我想知道是否必须添加引发并显示B类中引发了异常吗?
If you mean the following: 如果您的意思是:
public String getfoo(String foo2) throws SystemException { ... }
then the answer is no. 那么答案是否定的。 You don't have to declare that the method throws a
SystemException
, because it doesn't. 您不必声明该方法抛出
SystemException
,因为它不会。 It's thrown/handled in Class A
and it is not propagated to Class B
. 它在
Class A
引发/处理,并且不会传播到Class B
。 Did you, however, not handle the exception in Class A
, you would have to specify your exception in the method signature of Class A
if it's a Checked Exception
. 但是,如果您没有处理
Class A
的异常,则如果它是Checked Exception
则必须在Class A
的方法签名中指定您的Checked Exception
。 Then you could choose to handle it in Class B
or propagate it further. 然后,您可以选择在
Class B
进行处理或进一步传播。 Also needing to specify that Class B
throws a checked exception, or wrap in in a Runtime Exception
and throw it without declaring it in the method signature. 还需要指定
Class B
抛出一个检查异常,或者包装一个Runtime Exception
并抛出它,而不在方法签名中声明它。
public String getfoodata(Foo foo, String foo1, String foo2) throws SystemException { ... }
Also, do I have to Unit test that the method called in class B throws exception?
另外,是否必须对B类中调用的方法引发异常进行单元测试?
Class B
doesn't throw the exception. Class B
不会引发异常。 It's thrown in Class A
and handled over there. 它被扔到
Class A
并在那里处理。
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