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How-to articles, tricks, and solutions about JAVA-8

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.

java arrays java-8 java-stream

How to get milliseconds from LocalDateTime in Java 8

To get the milliseconds from a LocalDateTime object in Java 8, you can use the toInstant method and the toEpochMilli method.

java datetime java-8 java-time milliseconds

How to install Java 8 on Mac

To install Java 8 on macOS, follow these steps:

java macos java-8 installation

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.

java java-8 java-stream

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 java-8 java-stream lambda

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 collections java-8 java-stream distinct-values

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 java-8 java-stream for-loop

Java 8 Lambda function that throws exception?

In Java 8, you can use a lambda expression to create a functional interface that throws an exception.

java java-8 lambda

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.

java java-8 java-stream lambda

Java 8: Difference between two LocalDateTime in multiple units

To find the difference between two LocalDateTime objects in multiple units, you can use the Duration class.

java date datetime java-8 difference