Learning Journey Based on Android ndk-JNI Data Type

Based on Android ndk Learning Journey ----- JNI Data Type

Classic old-fashioned Process , LearningProgramming LanguageThings , Learn the most basic data types first , JNI This is also true. JNI Defines a series of basic data types and reference data types and Java .

 

1, Basic Data Type

The following table describesJavaBasic data types andJNISpace occupied by the correspondence between basic data types.

Just observe and you will find,Actually, it's just the basic data type.,JNIThe basic data type is onlyJavaThere are multiple Basic Data Types'J'Only

Of course, JNIAndJavaNot inJsize,Definition:

Typedef jint jsize;

ActuallyJsizeInteger is used to describe basic metrics and sizes, and there is no mystery.

2 , Reference Data Type

JNIReference Type AndJavaCorresponding Relationship As follows:
Tree hierarchy chart:

 

AndJavaSame, JobjectIs of all reference types Father. It's easy to understand ? Haha. AboutJthrowable, JNIThere is also a thread concept.

3,
The jvalue type

JvalueIs a collection of basic and referenced data types.,It is defined as follows:

Typedef Union jvalue {

Jboolean Z;

Jbyte
B;

 
JcharC;

Jshort
S;

Jint
I;

Jlong
J;

Jfloat
F;

JdoubleD;

Jobject 
L;

}
Jvalue;

 

 

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