Other ways to obtain `int[].class`?

Question

I would like to obtain int[].class from Matlab. Unfortunately, Matlab does not allow this syntax. Simultaneously, I allows to call any Java functions or access static members as is.

For example, I can't call

int.class

but can

java.lang.Integer.TYPE

Is it possible to find int[].class somewhere in JDK API in the same way?

Or ... `java.lang.reflect.Array.newInstance(Integer.TYPE, 0).getClass()` — Stephen C, Mar 22 '18 at 11:15
Also see https://stackoverflow.com/q/13392160/2891664 and https://stackoverflow.com/q/4901128/2891664. — Radiodef, Mar 22 '18 at 17:22

ernest_k · Accepted Answer · 2018-03-24T13:36:17.783

3

So I tried this in a jshell:

int[].class.getName()

And that yielded:

[I

And tried to reverse it:

Class.forName("[I")

And that seemed to parse it: class [I

So you could try Class.forName("[I"). And that seems to work just fine:

Class.forName("[I").isArray() // outputs true

edited Mar 24 '18 at 13:36

answered Mar 22 '18 at 11:16

ernest_k

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score 1 · Answer 2 · answered Mar 22 '18 at 22:35

You can use the Apache Commons package in order to achieve your goal. Signally, ClassUtils.getClass is what you are looking for:

>> org.apache.commons.lang.ClassUtils.getClass('int[]')

 ans = 
       class [I

For the sake of analyzing things deeply:

>> ans.get()

              Annotation: 0
             Annotations: [0×1 java.lang.annotation.Annotation[]]
          AnonymousClass: 0
                   Array: 1
           CanonicalName: 'int[]'
                   Class: [1×1 java.lang.Class]
             ClassLoader: []
                 Classes: [0×1 java.lang.Class[]]
           ComponentType: [1×1 java.lang.Class]
            Constructors: [0×1 java.lang.reflect.Constructor[]]
     DeclaredAnnotations: [0×1 java.lang.annotation.Annotation[]]
         DeclaredClasses: [0×1 java.lang.Class[]]
    DeclaredConstructors: [0×1 java.lang.reflect.Constructor[]]
          DeclaredFields: [0×1 java.lang.reflect.Field[]]
         DeclaredMethods: [0×1 java.lang.reflect.Method[]]
          DeclaringClass: []
          EnclosingClass: []
    EnclosingConstructor: []
         EnclosingMethod: []
                    Enum: 0
           EnumConstants: []
                  Fields: [0×1 java.lang.reflect.Field[]]
       GenericInterfaces: [2×1 java.lang.Class[]]
       GenericSuperclass: [1×1 java.lang.Class]
               Interface: 0
              Interfaces: [2×1 java.lang.Class[]]
              LocalClass: 0
             MemberClass: 0
                 Methods: [9×1 java.lang.reflect.Method[]]
               Modifiers: 1041
                    Name: '[I'
                 Package: []
               Primitive: 0
        ProtectionDomain: [1×1 java.security.ProtectionDomain]
                 Signers: []
              SimpleName: 'int[]'
              Superclass: [1×1 java.lang.Class]
               Synthetic: 0
          TypeParameters: [0×1 java.lang.reflect.TypeVariable[]]

Other ways to obtain `int[].class`?

2 Answers2