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2

I'm wrapping an Axis web service in a Springboot microservice and stumbled on some code that does not make sense.

Class cls = AmountInfo[].class;

What class is returned above ?

java compilation

share|improve this question

edited Mar 27 at 16:07

ernest_k

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asked Mar 27 at 16:06

VankuisherVankuisher

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• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possible duplicate of How does array class work in Java?
  
  – vincrichaud
  Mar 27 at 16:08
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That's what would be called the AmountInfo array class, and that's different from the class of AmountInfo
  
  – ernest_k
  Mar 27 at 16:09
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  By the way int.class is an other exotic class.
  
  – Joop Eggen
  Mar 27 at 16:10
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  "What class is returned above" - why did not you call "System.out.println(cls.getName())"?
  
  – Alexei Kaigorodov
  Mar 27 at 17:18
  

  
  
  
  

add a comment | 

2

I'm wrapping an Axis web service in a Springboot microservice and stumbled on some code that does not make sense.

Class cls = AmountInfo[].class;

What class is returned above ?

java compilation

share|improve this question

edited Mar 27 at 16:07

ernest_k

27k44 gold badges3232 silver badges5555 bronze badges

asked Mar 27 at 16:06

VankuisherVankuisher

9666 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possible duplicate of How does array class work in Java?
  
  – vincrichaud
  Mar 27 at 16:08
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That's what would be called the AmountInfo array class, and that's different from the class of AmountInfo
  
  – ernest_k
  Mar 27 at 16:09
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  By the way int.class is an other exotic class.
  
  – Joop Eggen
  Mar 27 at 16:10
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  "What class is returned above" - why did not you call "System.out.println(cls.getName())"?
  
  – Alexei Kaigorodov
  Mar 27 at 17:18
  

  
  
  
  

add a comment | 

I'm wrapping an Axis web service in a Springboot microservice and stumbled on some code that does not make sense.

Class cls = AmountInfo[].class;

What class is returned above ?

java compilation

share|improve this question

edited Mar 27 at 16:07

ernest_k

27k44 gold badges3232 silver badges5555 bronze badges

asked Mar 27 at 16:06

VankuisherVankuisher

9666 bronze badges

Class cls = AmountInfo[].class;

share|improve this question

edited Mar 27 at 16:07

ernest_k

27k44 gold badges3232 silver badges5555 bronze badges

asked Mar 27 at 16:06

VankuisherVankuisher

9666 bronze badges

share|improve this question

edited Mar 27 at 16:07

ernest_k

27k44 gold badges3232 silver badges5555 bronze badges

asked Mar 27 at 16:06

VankuisherVankuisher

9666 bronze badges

edited Mar 27 at 16:07

ernest_k

27k44 gold badges3232 silver badges5555 bronze badges

edited Mar 27 at 16:07

ernest_k

27k44 gold badges3232 silver badges5555 bronze badges

asked Mar 27 at 16:06

VankuisherVankuisher

9666 bronze badges

asked Mar 27 at 16:06

VankuisherVankuisher

9666 bronze badges

1 Answer
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1

Here's what the docs of java.lang.Class have to say about this:

Every array also belongs to a class that is reflected as a Class object that is shared by all arrays with the same element type and number of dimensions.

Just as the a Class object for the type AmountInfo, there is a Class for the array 1D array type AmountInfo[], just as there is also a type for the 2D array type AmountInfo[][], etc.

A Class of an array type returns true when isArray() is invoked on it. AmountInfo[].class is equivalent to AmountInfo.class.arrayType(). And you can use it with the reflection API the same way you can use a normal class (example below):

//Creating a 1D array of AmountInfo type
jshell> Array.newInstance(AmountInfo.class, 2)
$65 ==> AmountInfo[2] null, null 

// Creating a 2D array of AmountInfo type
jshell> Array.newInstance(AmountInfo[].class, 2)
$66 ==> AmountInfo[2][] null, null 

share|improve this answer

answered Mar 27 at 16:31

ernest_kernest_k

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1

Here's what the docs of java.lang.Class have to say about this:

Every array also belongs to a class that is reflected as a Class object that is shared by all arrays with the same element type and number of dimensions.

Just as the a Class object for the type AmountInfo, there is a Class for the array 1D array type AmountInfo[], just as there is also a type for the 2D array type AmountInfo[][], etc.

A Class of an array type returns true when isArray() is invoked on it. AmountInfo[].class is equivalent to AmountInfo.class.arrayType(). And you can use it with the reflection API the same way you can use a normal class (example below):

//Creating a 1D array of AmountInfo type
jshell> Array.newInstance(AmountInfo.class, 2)
$65 ==> AmountInfo[2] null, null 

// Creating a 2D array of AmountInfo type
jshell> Array.newInstance(AmountInfo[].class, 2)
$66 ==> AmountInfo[2][] null, null 

share|improve this answer

answered Mar 27 at 16:31

ernest_kernest_k

27k44 gold badges3232 silver badges5555 bronze badges

add a comment | 

1

Here's what the docs of java.lang.Class have to say about this:

Every array also belongs to a class that is reflected as a Class object that is shared by all arrays with the same element type and number of dimensions.

Just as the a Class object for the type AmountInfo, there is a Class for the array 1D array type AmountInfo[], just as there is also a type for the 2D array type AmountInfo[][], etc.

A Class of an array type returns true when isArray() is invoked on it. AmountInfo[].class is equivalent to AmountInfo.class.arrayType(). And you can use it with the reflection API the same way you can use a normal class (example below):

//Creating a 1D array of AmountInfo type
jshell> Array.newInstance(AmountInfo.class, 2)
$65 ==> AmountInfo[2] null, null 

// Creating a 2D array of AmountInfo type
jshell> Array.newInstance(AmountInfo[].class, 2)
$66 ==> AmountInfo[2][] null, null 

share|improve this answer

answered Mar 27 at 16:31

ernest_kernest_k

27k44 gold badges3232 silver badges5555 bronze badges

add a comment | 

Here's what the docs of java.lang.Class have to say about this:

Every array also belongs to a class that is reflected as a Class object that is shared by all arrays with the same element type and number of dimensions.

Just as the a Class object for the type AmountInfo, there is a Class for the array 1D array type AmountInfo[], just as there is also a type for the 2D array type AmountInfo[][], etc.

A Class of an array type returns true when isArray() is invoked on it. AmountInfo[].class is equivalent to AmountInfo.class.arrayType(). And you can use it with the reflection API the same way you can use a normal class (example below):

//Creating a 1D array of AmountInfo type
jshell> Array.newInstance(AmountInfo.class, 2)
$65 ==> AmountInfo[2] null, null 

// Creating a 2D array of AmountInfo type
jshell> Array.newInstance(AmountInfo[].class, 2)
$66 ==> AmountInfo[2][] null, null 

share|improve this answer

answered Mar 27 at 16:31

ernest_kernest_k

27k44 gold badges3232 silver badges5555 bronze badges

//Creating a 1D array of AmountInfo type
jshell> Array.newInstance(AmountInfo.class, 2)
$65 ==> AmountInfo[2] null, null 

// Creating a 2D array of AmountInfo type
jshell> Array.newInstance(AmountInfo[].class, 2)
$66 ==> AmountInfo[2][] null, null 

share|improve this answer

answered Mar 27 at 16:31

ernest_kernest_k

27k44 gold badges3232 silver badges5555 bronze badges

answered Mar 27 at 16:31

ernest_kernest_k

27k44 gold badges3232 silver badges5555 bronze badges

answered Mar 27 at 16:31

ernest_kernest_k

27k44 gold badges3232 silver badges5555 bronze badges