In many situations working with Java object, we need define toString(), equals() or hashCode() method. These methods can be added to the Java object automatically by using Project Lombok. In this tutorial, I will show you all about this! First of all, we need a… Read More
In this tutorial, I will show you how we can use Project Lombok to generate Getter, Setter methods or the constructors in a Java object automatically. OK, first of all, we need to create an example Maven project. with Project Lombok dependency as below:
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<dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.24</version> <scope>provided</scope> </dependency> |
In this tutorial, I will show you how we can install Project Lombok plugin into IntelliJ IDEA on macOS. – First of all, we need open our IntelliJ IDEA. – Go to IntelliJ IDEA -> Preferences… and then Plugins – Press Browse repositories… to search… 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
To filter a Map using Stream and Lambda Expression in Java, we will use the filter() method of Stream object which will be retrieved from Entry object of Map object with Lambda Expression as filter a List. How is it in details? Let learn together in… Read More
In this tutorial, I will show you how to order elements in a Map object using the Stream object and the Collectors object in Java by key and by value. For example, we have a Map object like this:
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Map<String, Integer> studentMap = new HashMap<>(); studentMap.put("Khanh", 31); studentMap.put("Thanh", 25); studentMap.put("Dung", 35); |
Prior to Java 8, to… Read More
Like RAML, the Swagger specification, or OpenAPI specification, is a specification used to define RESTful Web Service APIs. Springfox is a library used to create the RESTful API documentation in Spring, implement the Swagger specification. In this tutorial, let’s find out how to create RESTful… Read More
Sometime, your default Java machine and your Eclipse IDE couldn’t run using same Java version. For example, your default Java machine is Java 9 but the latest Eclipse IDE can only run on Java 8. So, how can we deal with this situation? In this… Read More
Stream is a new Java object, was introduced from Java 8. It helps us can manipulate on collections and arrays easier and more efficient. So what is it? In this article, I will introduce with you all about the Stream in Java. First, consider the… Read More
Since Java 8, we have ability to convert an object into another type by using map() method of Stream object with Lambda Expression. In this tutorial, I will show to you all some examples about it. Note that, map() method is an intermediate operation in… Read More
