Intellij：通过IDE创建一个随机数用作错误号/错误代码？

Question

在这里看到：The proper way to do exception handling

说这个代码：

function changeBookAuthor(int $id, string $newName){ 
    if(!$newName){ 
    throw new MyAppException('No author name was provided'); 
    } 

    $book = Books::find($id); 

    if(!$book){ 
    throw new MyAppException('The provided book id could not be found'); 
    } 
//.. 
} 

我想改变这种状况到：

function changeBookAuthor(int $id, string $newName){ 
     if(!$newName){ 
     throw new MyAppException('No author name was provided', <SOMEVERYRANDOMNUMBER>); 
     } 

     $book = Books::find($id); 

     if(!$book){ 
     throw new MyAppException('The provided book id could not be found', <SOMEVERYRANDOMNUMBER>); 
     } 
    //.. 
    } 

的IntelliJ能帮助我在选择随机数？

Answer 1

因为你使用IntelliJ，所以我很喜欢你使用Java。

我环顾四周网上，我发现，您可以生成一个随机数是这样的：

import java.util.Random; 

Random random = new Random(); 
int randomInt = random.nextInt(10); 

这会产生0到9之间的随机数

您的最终代码如下：

import java.util.Random; 

function changeBookAuthor(int $id, string $newName){ 
    if(!$newName){ 

    Random random = new Random(); 
    int randomInt = random.nextInt(10); 

    throw new MyAppException('No author name was provided', randomInt); 
    } 

    $book = Books::find($id); 

    if(!$book){ 

    Random random = new Random(); 
    int randomInt = random.nextInt(10); 

    throw new MyAppException('The provided book id could not be found', randomINT); 
    } 
//.. 
} 

下面是网站，我从得到的信息：http://alvinalexander.com/blog/post/java/create-some-random-numbers

Answer 2

我个人使用不同类型的异常而不是异常代码。

例如：

try{ 
    ... 
} catch (PDOException e1){ 
    // Show a message that we could not do SQL work 
} catch (NumberFormatException e2){ 
    // Show a message that input was not a valid number 
} catch (Exception e){ 
    // I'm not sure what was wrong but definitely there was some thing wrong 
} 

但是，如果你仍然想的随机数，去https://www.random.org，还有一些数生成器，复制值，并将其定义为在代码中的常数（我猜您正在使用PHP ）