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
The concept of transaction in the database is an important concept that all programmers should know because we will work a lot with this concept. In this article, I would like to talk to you about this concept! For the sake of illustration, let’s take… Read More
In this tutorial, I will show you the way to reset MySQL root password in macOS. Note: I work with MySQL 5.7.x for this tutorial, First of all, we need stop MySQL server using MySQL Start/Stop Configuration as below: Then, open Terminal and start MySQL… Read More
Normally, before Java 8, when we want to filter a List, we will iterate through the List and base on the condition we want to filter, we can have a new List on demand. For example, I have a List containing some student names as… Read More
Normally, before Java 8, when we want to sort a List object, we will use Comparator object. For example:
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package com.huongdanjava.javaexample; import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.List; public class Example { public static void main(String[] args) { List<String> names = new ArrayList<>(); names.add("Thanh"); names.add("Khanh"); names.add("Tan"); Collections.sort(names, new Comparator<String>() { @Override public int compare(String s1, String s2) { return s1.compareTo(s2); } }); for (String s : names) { System.out.println(s); } } } |
Result: Since Java 8, we have another way to do the sorting a List object. That is: using sort() method in List object with Lambda… Read More
In this tutorial, I will show you all how using Lambda Expression to foreach a Map object in Java. OK, let’s get started! Same like List object, the forEach () method is also added to the Map object since Java 8, which gives us more… Read More
In this tutorial, I will show you all how using Lambda Expression to foreach a List object in Java. OK, let’s get started! Usually from Java 7 and earlier, whenever you want to print out elements in a List object, for example:
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List<String> names = new ArrayList<>(); names.add("Khanh"); names.add("Tan"); names.add("Thanh"); |
We usually… Read More
In this tutorial, I would like to introduce to you all how to use properties in Spring with @Value annotation. First of all, we need a Maven project for example: I will use Java 17 for this example:
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<properties> <maven.compiler.source>17</maven.compiler.source> <maven.compiler.target>17</maven.compiler.target> </properties> |
Spring framework dependency:
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<dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>6.0.3</version> </dependency> |
HelloWorld class:… Read More
