This method was added from Java 9.
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default Stream<T> dropWhile(Predicate<? super T> predicate) |
This method also has the parameter Predicate interface and its function is the opposite of the takeWhile() method. This method also passes each element in your Stream object from left to right and ignores all elements that… Read More
This method was added from Java 9.
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default Stream<T> takeWhile(Predicate<? super T> predicate) |
The parameter of this method is the Predicate interface and this method takes the elements in your Stream object from left to right, until the condition of the Predicate object is no longer fulfilled. Example:
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package com.huongdanjava.javastream; import java.util.stream.Stream; public class Example { public static void main(String[] args) { Stream.of(1,2,3,4,5,6,7,8,9,10) .takeWhile(i -> i < 5) .forEach(System.out::println); } } |
In… Read More
Multithreading is the notion of handling program actions that do not take place in the program’s main Thread, which is handled by many different Threads. This concept will make the processing of the program faster. We have many ways to implement multithreading in Java, but… Read More
Reactive Streams are a concept that defines the mechanism for handling streams asynchronously with non-blocking back pressure. Back pressure here, we can understand that there is too much work to do at the same time, then it should lead to overload. Non-blocking back pressure means… Read More
If you have ever worked with some languages like Python, Scala, you may know we can write code and execute code for those languages using only the command line. This will allow us to test some code without having to do a lot of things,… Read More
In the previous tutorial about NullPointerException in Java, I have presented to you some cases where NPE can occur and how to deal with them to avoid. From Java 8, we have another way to avoid NullPointerException, that will use the Optional object. What is… Read More
Immutable Collection likes an Immutable Object, once created, we can not edit anything on that Object or Collection. From Java 8 and earlier, to initialize an Immutable Collection like List, Set, or Map, we will use the unmodifiableXXX() methods in the java.util.Collections class. For example,… Read More
In Java, we know that two types of data are primitive and object. So, Lambda Expression is defined as an anonymous function, what is its data type? In this tutorial, let’s find out together! OK, as I mentioned earlier, Lambda Expression is used with a… Read More
Serialization is a concept that allows us to convert the state of a Java object into a certain format so that this Java object can be stored somewhere and then it will be used by another process. Normally, when using Serialization, our Java object will… Read More
When working with Stream in Java, sometime we can have a Stream with datatype of a List, Set or Array of object. For example:
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List<String> students1 = new ArrayList<>(); students1.add("Khanh"); List<String> students2 = new ArrayList<>(); students2.add("Thanh"); students2.add("Dung"); List<List<String>> students = Arrays.asList(students1, students2); Stream<List<String>> stream = students.stream(); |
Here, we have List of List of String object and when convert into Stream object, we have Stream of List… Read More
