空指针异常。obj.sayHi(),obj为null。 建议与非建议 建议 编写一些程序,进行一次测试。 注释好你代码所依赖的东西。如先决条件等。 充分利用静态代码检查。不要假设你的代码无bug,或者容易发现和修复。 目标 safe from bug。现在表现正确,将来也表现正确。 easy to understand。代码要能与将来的开发者沟通,因为他们...
My apologies if you've already discussed this to death; just let me know. I ran into this today. var fallback = ...; myOption.fold(fallback::g, null); I was in a test where I knew myOption is none(), so I didn't bother supplying a functi...
好神奇的 check 方式。 The default forResultSet.getIntwhen the field value isNULLis to return0, which is also the default value for youriValdeclaration. In which case your test is completely redundant. If you actually want to do something different if the field value is NULL, I suggest: ...
The variable BPA_REC3.VALID_CATEGORY_VALUE_ID is of type double, and I am getting two errors: The operator == is undefined for the argument type(s) double, null Cannot invoke length() on the primitive type double How can I resolve this? if ((BPA_REC3.VALIDATE_LIST_FLAG....
assertFalse(isArrayNullOrEmpty(INT_ARRAY)); When we run the test, we have a compiler error: java: method isArrayNullOrEmpty in class ... cannot be applied to given types; required: T[] found: int[] reason: inference variable T has incompatible bounds This is because Java generics are...
Checking method/constructor parameters fornullvalues is a commontaskproblem in Java. To assist you with this, various Java libraries provide validation utilities (seeGuava Preconditions,Commons LangValidateorSpring'sAssertdocumentation). However, if you only want to validate for nonnullvalues you can us...
/* malloc’ed area when the first argument is NULL, */ /* program should remember to free this. In this */ /* case the block is not freed and results in leak.*/ } You can avoid memory leaks by always freeing memory when it is no longer needed and paying close attention to librar...
if (!rc.equals(null) { ... This throws the null pointer exception. Hibernate will correctly give me a RoadCond object but there is no values of course in the getters and setters. Obviously I can throw it into a try/catch block but I would think there has to be an easier way to ...
This is because the code introduced in this PR lack of a null checking and throw : com.puppycrawl.tools.checkstyle.api.CheckstyleException: Exception was thrown while processing ... Caused by: java.lang.NullPointerException: Cannot invoke "com.puppycrawl.tools.checkstyle.api.DetailAST.getType()"...
Returns the certificate being checked. This is not a criterion. Rather, it is optional information that may help aCertStorefind CRLs that would be relevant when checking revocation for the specified certificate. If the value returned isnull, then no such optional information is provided. ...