Java Interfaces (msg srv)

ROS Java Interfaces

1. Background

More info on official About ROS Interfaces

2. Message Description Specification

2.1.1 Field Types

built-in-types currently supported:

Type name	C++	Java	DDS type
bool	bool	boolean	boolean
byte	uint8_t	byte	octet
char	char	char	char
float32	float	float	float
float64	double	double	double
int8	int8_t	byte	octet
uint8	uint8_t	byte	octet
int16	int16_t	short	short
uint16	uint16_t	short*	unsigned short
int32	int32_t	int	long
uint32	uint32_t	int*	unsigned long
int64	int64_t	long	long long
uint64	uint64_t	long*	unsigned long long
string	std::string	java.lang.String	string

• Java doesn't provided unsigned type...

Every built-in-type can be used to define arrays:

Type name	C++	Java	DDS type
static array	std::array<T, N>	java.util.ArrayList< T >	T[N]
unbounded dynamic array	std::vector	java.util.ArrayList< T >	sequence
bounded dynamic array	custom_class<T, N>	java.util.ArrayList< T >	sequence<T, N>
bounded string	std::string	java.lang.String	string

*All types that are more permissive than their ROS definition enforce the ROS constraints in range and length by software