February 2014
Intermediate to advanced
160 pages
4h 59m
English
Content preview from Functional Programming in Java
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Picking an Element
It’s reasonable to expect that picking one element from a collection would be simpler than picking multiple elements. But there are a few complications. Let’s look at the complexity introduced by the habitual approach and then bring in lambda expressions to solve it.
Let’s create a method that will look for an element that starts with a given letter, and print it.
| collections/fpij/PickAnElement.java | |
| | public static void pickName( |
| | final List<String> names, final String startingLetter) { |
| | String foundName = null; |
| | for(String name : names) { |
| | if(name.startsWith(startingLetter)) { |
| | foundName = name; |
| | break; |
| | } |
| | } |
| | System.out.print(String.format("A name starting with %s: ", startingLetter)); ... |