Java Reference
In-Depth Information
Table 2-5. Java statements
Statement
Purpose
Syntax
expression
side efects
var
=
expr
;
expr
++;
method
();
new
Type
( );
a
x
compound
group statements
{
statements
}
empty
do nothing
;
labeled
name a statement
label
:
statement
variable
declare a variable
[final]
type
name
[=
value
]
[
,
name
[=
value
]] …;
conditional
if (
expr
)
statement
[ else
statement
]
if
conditional
switch (
expr
) {
[ case
expr
:
statements
] …
[ default
:
statements
]
}
switch
loop
while (
expr
)
statement
while
loop
do
statement
while (
expr
);
do
simpliied loop
for (
init
;
test
;
increment
)
statement
for
foreach
collection iteration
for (
variable
:
iterable
)
statement
exit block
break [
label
] ;
break
restart loop
continue [
label
] ;
continue
end method
return [
expr
] ;
return
critical section
synchronized (
expr
) {
statements
}
synchronized
throw exception
throw
expr
;
throw
handle exception
try {
statements
}
[ catch (
type
name
) {
state
ments
} ] ..
.
[ finally {
statements
} ]
try
verify invariant
assert
invariant
[
:
error
];
assert
Expression Statements
As we saw earlier in the chapter, certain types of Java expressions have side effects.
In other words, they do not simply evaluate to some value; they also change the
