The following is a series of posts about "functional programming in Java" which is the result of my understanding by reading the book " Java 8 in Action: Lambdas, Streams, and Functional-style Programming, by Alan Mycroft and Mario Fusco ". 1. Why functional programming? 2. Functional programming in Java 8 3. Java 8 - Using Functions as Values 4. Java 8 - Persistent data structure In general, the phrase "functional-style programming" means the behavior of functions should be like that of mathematical-style functions - no side effects. In programmers' point of views, functions may be used like other values: passed as arguments, returned as result, and stored in data structures . That means we can use the :: operator to create a method reference, and lambda expressions to directly express function values . For example: //method reference Function<String, Integer> strToInt = Integer::parseInt; //lambda expression Comparator<Integer&g
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