Java Reference
In-Depth Information
The employee makes more than 50,000:
#{elExampleManagedBean.displayResult(x -> x.wage gt 50000)}
Next, you'll take a look at the eLExampleManagedBean.displayResult method, which accepts
a javax.el.LambdaExpression as a parameter.
public boolean displayResult(javax.el.LambdaExpression le){
Employee e = new Employee(); // Grab an employee instance
if (le.invoke(e)){
return true;
} else {
return false;
Collections Enhancements
Collections have been reworked for EL 3.0, bringing them more in line with Java SE 8. Collections (sets, maps, and
lists) can be constructed dynamically in EL. EL collections can be constructed from literals or from EL expressions.
This can be a huge advantage when dynamically constructing a collection. In this section, I will briefly cover examples
for creating and using each type of collection.
Sets are surrounded by curly braces, as in {} , and elements of the set are separated by commas. The following are
examples of Set objects:
{a, b, c}
{1, "two", 3}
{a * b, 3, 5 * c}
Maps are key-value pairs, just like in the Java language. They are surrounded by curly braces, as in {} , just like Set
objects. In a Map element, a colon is used to separate the key from the value. The following are examples of Map
{"one":1, "two":2, 3:"three"}
{"first":"Josh", "last":"Juneau}
Lists are very similar to Set objects, but they have a different syntax because they are enclosed by brackets, [] , rather
than braces. The following are examples of List objects:
[a, b, c]
[1, "two", 3]
[d, [e, f, g, h], x]
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