Class structure
Feature	Joos 0	Joos 1	Joos 2	Java 1.3
extends		X	X	X
implements		X	X	X
static method declaration		X	X	X
class import		X	X	X
package import		X	X	X
package		X	X	X
public interfaces			X	X
static field declaration			X	X
package private interfaces				X
omitted final field initializer				X
multiple types per file				X
interface constants				X
Unicode input				X
nested types				X
Method and field access
Feature	Joos 0	Joos 1	Joos 2	Java 1.3
external call		X	X	X
implicit this for fields		X	X	X
implicit this for methods		X	X	X
access static field		X	X	X
call static methods		X	X	X
non-this field access		X	X	X
method overloading		X	X	X
array length		X	X	X
implicit this class for static fields			X	X
implicit this class for static methods			X	X
closest match method overloading			X	X
array method call			X	X
super method call				X
non-static access of static field				X
non-static access of static method				X
Modifiers
Feature	Joos 0	Joos 1	Joos 2	Java 1.3
public classes	X	X	X	X
protected fields	X	X	X	X
public constructors	X	X	X	X
public methods	X	X	X	X
public fields		X	X	X
protected methods		X	X	X
abstract		X	X	X
final classes		X	X	X
final methods		X	X	X
protected constructors		X	X	X
final field declaration			X	X
synchronized				X
transient				X
strictfp				X
native				X
volatile				X
package private classes				X
package private methods				X
package private fields				X
private methods				X
private fields				X
final formals				X
final locals				X
Constructors
Feature	Joos 0	Joos 1	Joos 2	Java 1.3
implicit super call	X	X	X	X
field initializers	X	X	X	X
constructor overloading		X	X	X
omitted constructor			X	X
explicit super call			X	X
closest match constructor overloading			X	X
this call			X	X
instance initializers				X
static initializers				X
Method structure
Feature	Joos 0	Joos 1	Joos 2	Java 1.3
nested blocks		X	X	X
arbitrary return		X	X	X
omitted void return		X	X	X
arbitrary local declaration		X	X	X
omitted local initializer			X	X
local variable in own initializer			X	X
multiple variables per declaration				X
Control flow
Feature	Joos 0	Joos 1	Joos 2	Java 1.3
if	X	X	X	X
while	X	X	X	X
for (simple)		X	X	X
for (general)				X
do-while				X
switch				X
break				X
continue				X
labeled statement				X
synchronized statement				X
Exceptions
Feature	Joos 0	Joos 1	Joos 2	Java 1.3
throws		X	X	X
throw			X	X
try/catch				X
finally				X
Types
Feature	Joos 0	Joos 1	Joos 2	Java 1.3
boolean	X	X	X	X
int	X	X	X	X
char		X	X	X
byte		X	X	X
short		X	X	X
array		X	X	X
multi array			X	X
long				X
float				X
double				X
Literals and names
Feature	Joos 0	Joos 1	Joos 2	Java 1.3
int literals	X	X	X	X
boolean literals	X	X	X	X
string literals	X	X	X	X
null literal	X	X	X	X
char literals		X	X	X
character escapes		X	X	X
compound names		X	X	X
class literals				X
octal and hex literals				X
long literals				X
floating point literals				X
array data				X
Operations
Feature	Joos 0	Joos 1	Joos 2	Java 1.3
arithmetic operations	X	X	X	X
comparison operations	X	X	X	X
eager boolean operations	X	X	X	X
implicit string concatenation	X	X	X	X
lazy boolean operations		X	X	X
instanceof		X	X	X
primitive casts		X	X	X
reference casts		X	X	X
bitwise operations			X	X
increment and decrement			X	X
assignment operations				X
unary plus				X
choice				X
bit shift				X
implicit integer constant casts				X