How-to articles, tricks, and solutions about JAVA

Java does not have an unsigned int data type.

To decode base64 data in Java, you can use the Base64.Decoder class introduced in Java 8. Here's an example of how to use it:

In Java, objects are automatically eligible for garbage collection when they are no longer reachable.

To determine if a string is an integer in Java, you can use the isDigit() method of the Character class to check if each character in the string is a digit. Here's an example:

In Java, the wait() method is used to pause the current thread and allow other threads to execute. It is called on an object and causes the current thread to wait until another thread calls the notify() or notifyAll() method on the same object.

In the context of testing with the Mockito framework, the @Mock annotation is used to create a mock object of a class or interface, and the @InjectMocks annotation is used to inject the mock objects into a test class.

In Java, the & operator is a bitwise AND operator, and the && operator is a logical AND operator.

In Java, the break and continue statements are used to control the flow of a loop.

In Java, DTO stands for Data Transfer Object, and it is a simple object that is used to carry data between processes. DTOs are often used when transferring data over a network, or between layers of an application. They typically have private fields, and g

In the Java Persistence API (JPA), the FetchType enum is used to specify the strategy for fetching data from the database.

In Java, HashMap, LinkedHashMap, and TreeMap are all implementations of the Map interface.

The StringBuilder and StringBuffer classes in Java are used to create mutable strings. A mutable string is a string that can be modified after it is created, unlike a regular string, which is immutable and cannot be modified.

The Oracle JDK (Java Development Kit) and the OpenJDK are two implementations of the Java SE (Standard Edition) platform.

To display the current time in 12-hour format with AM/PM in Java, you can use the SimpleDateFormat class and the Calendar class.

In Java, a finally block is guaranteed to be executed, unless the virtual machine exits abruptly due to an uncaught exception or a call to System.exit.

In Java, the length of a primitive array reflects the number of allocated elements in the array. This is the maximum number of elements that the array can hold.

In Java, there is no native support for multiline strings.

Java does not have built-in support for default parameter values like some other programming languages.

No, the isEmpty() method of the java.util.List interface does not check if the list itself is null.

doGet and doPost are methods of the javax.servlet.http.HttpServlet class that are used to handle HTTP GET and POST requests, respectively.

To format a double value as a decimal in Java, you can use the DecimalFormat class from the java.text package. Here's an example of how to use it:

To download a file with Android and show the progress in a ProgressDialog, you can use the following steps:

To download a file from a Spring controller, you can use the ResponseEntity class along with the InputStreamResource class.

If you are trying to download the Java Development Kit (JDK) on Linux using wget and you are being shown the license page instead of the JDK download, it is likely because the download page has changed since the wget command was written.

To convert a List to a Set in Java, you can use the new HashSet<>(list) constructor to create a new HashSet and initialize it with the elements of the List.