Java Reference
In-Depth Information
7).toList()"));
out.println("The sum of : " + l + " is
: "
+
el.eval("list.stream().sum()"));
}
}
String concatenation operator (
+=
)
The
+=
operator returns the concatenation of operands located on either side of the
operator. For example,
1 += 2
returns 12 while
1 + 2
returns 3. To welcome a new
connected student to our website we only need to locate the following expression
somewhere in a web page:
#{'Welcome' += studentBean.lastName}
.
Assignment operator (
=
)
The
A = B
expression assigns the value of
B
to
A
. To make this possible,
A
must be
a writable property. The assignment operator (
=
) can be used to change the value
of a property. For example, the
#{studentBean.identity = '96312547'
} ex-
pression assigns the value
96312547
to property
studentBean.identity
.
Note
The assignment operator returns a value and it is right-associative. The expres-
sion
a = b = 8 * 3
is the same as
a = (b = 8 * 3)
.
Semi-colon operator (
;
)
The semi-colon operator can be used like the comma operator in C or C++. When
two expressions exp1 and exp2 are separated by a semi-colon operator, the first ex-
pression is evaluated before the second, and it is the result of the second expression
that is returned. The first expression may be an intermediate operation, such as in-
crementation, whose result will be used in the last expression.
