How-to articles, tricks, and solutions about JAVA

To time the execution of a method in Java, you can use the System.nanoTime method to get the current time before and after the method is called, and then subtract the start time from the end time to get the elapsed time. Here's an example of how you can d

To update an entity using Spring Data JPA, you will need to follow these steps:

A PriorityQueue is a queue data structure that pops the element with the highest priority first.

In Java, you can use method overloading to achieve the effect of optional parameters. Method overloading is the practice of having multiple methods with the same name but different parameter lists.

To create a dictionary (or map) in Java, you can use the Map interface and its implementing classes.

To import classes in a JSP (JavaServer Page) file, you can use the <%@ page import="package.class" %> directive.

To stop a thread in Java, you can use the interrupt() method of the Thread class.

You can use the instanceof operator to determine the type of a variable in Java.

To return a JSON object from a Java Servlet, you can use the following steps:

In Java, the final keyword can be used in several contexts to declare that something cannot be changed.

The Java for-each loop, also known as the enhanced for loop, is a convenient way to iterate over the elements of an array or a collection. It eliminates the need to use an index variable to access the elements of the collection.

The default maximum heap size for the Java heap is determined by the amount of physical memory available on the system.

To set a background drawable programmatically in Android, you can use the setBackgroundDrawable method of the View class.

In JSON, certain characters must be escaped in strings.

An interface is a collection of abstract methods that define a set of functions that a class must implement.

To access a value defined in the application.properties file in Spring Boot, you can use the @Value annotation and the Environment interface.

In Java, you can add an image to a JPanel using the drawImage() method of the Graphics class. To do this, you will need to:

To add a button click event in Android Studio, follow these steps:

To add a directory to the classpath in an application run profile in IntelliJ IDEA, follow these steps:

To add a local JAR file dependency to a build.gradle file, you can use the compile fileTree() method and specify the directory where the JAR file is located.

To add a local JAR file to a Maven project, you can use the maven-install-plugin. Here's how you can do it:

To add new elements to an array in Java, you have a few options: If you know the size of the array in advance and the array is not full, you can simply assign a new value to an unused element in the array.

There are a few different ways to add one day to a date.

To append a newline to a StringBuilder object in Java, you can use the append method and pass it a newline character.

To append text to the end of an existing file in Java, you can use the Files.write() method from the java.nio.file package. This method allows you to write a sequence of characters to a file in a single operation.