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Android NDK - Type Signatures

1.The JNI uses the Java VM’s representation of type signatures.

Type Signature Java Type
Z boolean
B byte
C char
S short
I int
J long
F float
D double
L fully-qualified-class fully-qualified-class
[ type type[]
( arg-types ) ret-type method type

2.其中前几个基本类型比较好理解,只对对象和数组进行举例:

Type Signature Java Type
Ljava/lang/String; String
[ I int[]
[ Ljava/lang/Object; Object[]
  • 对象类型:以”L”开头,以”;”结尾,中间是用”/“ 隔开。如上表第1个
  • 数组类型:以”[“开,。如上表(n维数组的话,则是前面多少个”[“而已,如”[[I”表示“int[][]”)
  • 对象数组类型:同数组类型

3.还有就是方法的signature,举几个例子:

signature Java Type
()Ljava/lang/String; String func()
(ILjava/lang/String;)I int func(int a, String b)
([I)V void func(int[] arr)