Java™ Native Interface: Programmer’s Guide and Specification, The

Chapter 12. JNI Types

This chapter specifies the standard data types defined by the JNI. C and C++ code should include the header file jni.h before referring to these types.

Primitive and Reference Types

The JNI defines a set of C/C++ types that correspond to the primitive and reference types in the Java programming language.

Primitive Types

The following table describes the primitive types in the Java programming language and the corresponding types in the JNI. Like their counterparts in the Java programming language, all primitive types in the JNI have well-defined sizes.

Java Language Type	Native Type	Description
boolean	jboolean	unsigned 8 bits
byte	jbyte	signed 8 bits
char	jchar	unsigned 16 bits
short	jshort	signed 16 bits
int	jint ...