w3docs logo
  1. Snippets
    2. ›
  2. java

How-to articles, tricks, and solutions about JAVA

Why is my Spring @Autowired field null?

There are several reasons why an @Autowired field in a Spring bean might be null:

java null nullpointerexception spring autowired

Why is processing a sorted array faster than processing an unsorted array in Java?

Processing a sorted array can be faster than processing an unsorted array because certain algorithms and operations have a lower average time complexity when the input is already sorted.

java performance c++ cpu-architecture branch-prediction

Why is subtracting these two times (in 1927) giving a strange result?

Without more context, it is difficult to say why subtracting two times would give a strange result. Here are a few potential explanations:

java date timezone

Why is the Java main method static?

In Java, the main method is declared as static because the JVM (Java Virtual Machine) needs to be able to invoke it without creating an instance of the class that contains it.

java static program-entry-point

Why is there no SortedList in Java?

There is no SortedList class in the Java standard library because the List interface already provides a way to store elements in a specific order.

java collections sorting

Why use getters and setters/accessors?

Getters and setters, also known as accessors, are methods that are used to get and set the values of an object's properties.

java oop setter getter abstraction

Why would a "java.net.ConnectException: Connection timed out" exception occur when URL is up?

A java.net.ConnectException: Connection timed out error can occur when a Java application is unable to establish a network connection to the specified host.

java urlconnection connection connectexception