How-to articles, tricks, and solutions about JAVA-STREAM
Find first element by predicate
To find the first element in a list that matches a certain condition, you can use the stream() method to create a stream from the list, and then use the filter() method to specify the condition that the element should satisfy. Finally, you can use the fin
How to convert a Java 8 Stream to an Array?
To convert a Java 8 Stream to an array, you can use the toArray() method of the Stream interface.
How to sum a list of integers with java streams?
You can use the reduce() operation in the Java Streams API to sum the elements of a list of integers.
How to use a Java8 lambda to sort a stream in reverse order?
To use a Java 8 lambda to sort a stream in reverse order, you can use the sorted() method of the Stream interface and pass a lambda function that compares the elements in reverse order.
Java 8 Distinct by property
To get a list of distinct elements by a property in Java 8, you can use the distinct() method of the Stream interface and the map() method to extract the property from each element.
Java 8 Iterable.forEach() vs foreach loop
In Java 8, the Iterable.forEach() method is a default method that allows you to iterate over the elements of an Iterable (such as a List or Set) and perform a specific action on each element.
Java 8 List<V> into Map<K, V>
To convert a List<V> into a Map<K, V> in Java 8, you can use the toMap() method of the Collectors class from the java.util.stream package.
Using streams to convert a list of objects into a string obtained from the toString method
You can use the map and collect methods of the Stream class to achieve this.