That's why the filter (Predicate condition) accepts a Predicate object, which provides a function that is applied to a condition. The filter method essentially selects elements based on a condition you provide. ![]() For example, if your list contains numbers and you only want numbers, you can use the filter method to only select a number that is fully divisible by two. The filter method, as its name suggests, filters elements based upon a condition you gave it. It is also an intermediate Stream operation, which means you can call other Stream methods, like a filter, or collect on this to create a chain of transformations. Then, the map() function will do the transformation for you. For example, by using the map() function, you can convert a list of String into a List of Integer by applying the Integer.valueOf() method to each String on the input list.Īll you need is a mapping function to convert one object to the other. That's why the Stream.map(Function mapper) takes a function as an argument. In simple words, the map() is used to transform one object into other by applying a function. The map() function is a method in the Stream class that represents a functional programming concept. Even though I have previously blogged about both the map() and filter(), I am writing again to expand on the concept in layman's language to provide even better understanding for everyone. Hello, guys! Many of my readers emailed me, asking to write a post about the map and filter function of Java 8, because they found it difficult to use and understand. Note: When you purchase through links on our site, we may receive an affiliate commission.
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