Java_jni Field Descriptor "([ljava/lang/string;) V" (Android)

jni Field Descriptor "([ljava/lang/string;) V

"([ljava/lang/string;) V" It is an encoding of function return values and parameters. This encoding is called the Jni field descriptor (javanative Interface fielddescriptors). 、

An array of int[], it needs to be expressed as such "[I".

If more than one array double[][][] is required to be represented as such "[[[D]. That is, each square bracket starts with an array of dimensions. After more than one box, it is the type of the array.

If a descriptor that begins with an L is a class descriptor , it is followed by the string of the class, and then the semicolon ";" ends.

such as "ljava/lang/string;" is the expression type string;

"[I" means int[];

"[Ljava/lang/object;] is the expression object[].

The Jni method descriptor is mainly to place the parameters in parentheses, followed by the return type after the parentheses, as follows:

(parameter descriptor) return type

When a function does not need to return a parameter type, it is represented by "V".

such as "() ljava/lang/string;" is the expression string f ();

"(Iljava/lang/class;) J" means long f (int i, Class c);

"([B) V" means void String (byte[] bytes);

Java type	Symbol
Boolean	Z
Byte	B
Char	C
Short	S
Int	I
Long	J
Float	F
Double	D
Void	V
Objects Object	Start with "L", with ";" End, the middle is a "/" separated by the package and the class name. For example: ljava/lang/string; if it is a nested class, use $ to represent nesting. For example "(ljava/lang/string; landroid/os/fileutils$filestatus;) Z "

In addition, the shorthand for the array type is expressed as "[" plus the shorthand form of the corresponding type shown in Table A.

Like what:

[I means int [];

[l/java/lang/objects; means objects[],

Other than that. A reference type (other than an array of primitive types) is marked with a ";" at the end.

For example:

"() V" means void Func ();

"(II) V" denotes void Func (int, int);

"(ljava/lang/string; ljava/lang/string;) I ". Represents int Func (string,string)

"

Java_jni Field Descriptor "([ljava/lang/string;) V" (Android)