unchecked-exception | 易学教程

Should unchecked exceptions be caught and dealt with?

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问题 I have been reading many posts about exceptions lately and I have a question whether unchecked exceptions should be caught. I have read that if you want your application to recover from an error you use checked exceptions. However if you can't deal with the checked exception you either wrap it into another checked exception so you can pass it to another layer; for instance you wrap an SqlException , or you throw an unchecked exception. However, should you catch unchecked exceptions? Are

How does one decide to create a checked excpetion or an unchecked exception [duplicate]

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问题 This question already has answers here : Understanding checked vs unchecked exceptions in Java (21 answers) Closed 3 years ago . I want to know how does one know to create and throw a checked exception or an unchecked exception. For example I have a service which takes some data and validates it before using it. During validation a certain field did not meet the rules and I want to throw an exception say ValidationException(). How will I know of decide it should be checked or unchecked. In

How does one decide to create a checked excpetion or an unchecked exception [duplicate]

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How does JVM handles RuntimeException(s)

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问题 While creating custom exceptions, If we want to create a checked Exception we extend the Exception class and for unchecked exception we extend the RuntimeException class. My question is, how JVM handles subClasses of RuntimeException and Exception differently when they all are sub classes of the Exception class. 回答1: It doesn't. The only difference is in requirements enforced by the compiler. 回答2: You are mistaken that the JVM handles the exceptions differently, but your question is still

Is there any easy way to see what exceptions a Kotlin function throws?

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问题 I mostly understand the potential issues with checked exceptions and why Kotlin omits them. However, the issue I am encountering is I can't find any foolproof way of clearly indicating to the caller what exceptions a function may throw. I have run into the issue countless times in Python where my program will crash after running for months because I didn't realise a function from some library I'm using can raise a particular exception. Although being forced to catch exceptions can be quite

How to identify checked and unchecked exceptions in java?

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问题 While reading about exception, I will always come across checked exceptions and unchecked exceptions, So wanted to know how to distinguish that which is what? Edit: I want to know if i create any exception class then how can i create as a checked or as an unchecked? and what is the significance of each? 回答1: All Throwable s except subclasses of java.lang.RuntimeException or java.lang.Error are checked. Properly, in Java, "exceptions" are subclasses of java.lang.Exception , "errors" are

How does one decide to create a checked excpetion or an unchecked exception [duplicate]

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This question already has an answer here: Understanding checked vs unchecked exceptions in Java 21 answers I want to know how does one know to create and throw a checked exception or an unchecked exception. For example I have a service which takes some data and validates it before using it. During validation a certain field did not meet the rules and I want to throw an exception say ValidationException(). How will I know of decide it should be checked or unchecked. In another case I am calling an external web service from my code for example the google stock api. Let's assume i have a timeout

Is disabling Checked Exceptions in Java possible?

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I was reading an article about checked and unchecked Exceptions in Java and found this article/link: https://projectlombok.org/disableCheckedExceptions.html According to the article it's just a hack developed for javac. Consider the code snippet below: import java.io.*; class Example { public static void main(String args[]) throws IOException { FileInputStream fis = null; fis = new FileInputStream("myfile.txt"); int k; while(( k = fis.read() ) != -1) { System.out.print((char)k); } fis.close(); } } Here I have to write public static void main(String args[]) throws IOException because I am

Is disabling Checked Exceptions in Java possible?

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问题 I was reading an article about checked and unchecked Exceptions in Java and found this article/link: https://projectlombok.org/disableCheckedExceptions.html According to the article it's just a hack developed for javac. Consider the code snippet below: import java.io.*; class Example { public static void main(String args[]) throws IOException { FileInputStream fis = null; fis = new FileInputStream("myfile.txt"); int k; while(( k = fis.read() ) != -1) { System.out.print((char)k); } fis.close()

How does JVM handles RuntimeException(s)

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While creating custom exceptions, If we want to create a checked Exception we extend the Exception class and for unchecked exception we extend the RuntimeException class. My question is, how JVM handles subClasses of RuntimeException and Exception differently when they all are sub classes of the Exception class. It doesn't. The only difference is in requirements enforced by the compiler. You are mistaken that the JVM handles the exceptions differently, but your question is still valid if you are asking how the compiler treats them differently. And this has a simple answer: the rule does not