Collections - Scripting in Java: Integrating with Groovy and JavaScript - page 247

// The following statement will throw an IndexOutOfBoundsException because
// it is trying to add a new element using teh array syntax. You can only
// update an element, not add a new element, using the array syntax.
// nameList[3] = "An";

print("After updating names:");
for(var i = 0, len = nameList.length; i < len; i++) {
print(nameList[i]);
}

// Sort the list in natural order
nameList.sort(null);

// Use the Array.prototype.forEach() method to print the list
print("After sorting names:");
Array.prototype.forEach.call(nameList, function (value, index, data) {
print(value);
});

After adding names:
Lu
Do
Yu
After updating names:
Su
So
Bo
After sorting names:
Bo
So
Su

The example performs several things:

• Creates an instance of the

java.util.ArrayList

• Use the

add() method of the Java List interface to add three
elements to the list

• Prints the elements using the

size() and get() method of the

List interface
Updates the elements and prints them using the Nashorn syntax •

for accessing array elements. It uses the Nashorn property length
to get the size of the list