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 int[], it needs to be represented as such "[I". If multiple arrays double[][][] is required to be represented as such "[[[D]. In other words, each square bracket begins, representing an array dimension. After multiple boxes, is the type of the array.

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

Like "ljava/lang/string;" is the presentation type string;

"[I" means int[];

"[Ljava/lang/object;" is to express object[].

The Jni method descriptor, which places the argument in parentheses, places the return type behind the parentheses, as follows:

(parameter descriptor) return type

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

For example "() ljava/lang/string;" is to represent 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
Voi D	V
Objects Object	start with "L" with ";" At the end, the middle is a "/"   separated package and class name. For example: ljava/lang/string; if it is a nested class, then the $ is used to represent nesting. For example   "(ljava/lang/string; landroid/os/fileutils$filestatus;) Z "

Another shorthand for an array type is represented by "[" plus a shorthand for the corresponding type as shown in Table A.

For example: [I represents int [];[ L/java/lang/objects means objects[], in addition. The label of a reference type (other than an array of basic types) has a last ";"

For example:

"() V" means void Func ();

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

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