In this tutorial, we will learn how to create threads in Java. Here, we have examples, in which we are creating threads by extending the Thread class and by implementing the Runnable interface.
In particular, a thread may not be restarted once it has completed execution. //example, create three threads to download pic from specificate URL concurrly import org.apache.commons.io.FileUtils; import java.io.File; import java.io.IOException; import java.net.URL; public class Picture...
import javax.imageio.ImageIO; import javax.swing.*; import java.awt.*; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; To read an image from the file system, we create an object from the BufferedImage class and use the ImageIO.read() method. The...
StringBuilderis another tool for strings that are done easier in Java. While many would useStringBuffer, it is not as quick to use as StringBuilder. To check for yourself, instantiate a new StringBuilder and call the append method to add new parts to the string. Once all the working parts ...
Exception in thread "main" java.util.NoSuchElementException: No value present at java.util.Optional.get(Optional.java:135) at Test.main(Test.java:8) Let’s understand the above code. Iterated an array using stream API in java8, Stream is another way to iterate the enumerated object types...
One of its many options allows us to capture a heap dump. If we right-click on a Java process and select the“Heap Dump”option, the tool will create a heap dump and open it in a new tab: Notice that we can find the path of the file created in the“Basic Info”section. ...
In Java How to remove elements from ArrayList while iterating? The list.remove(s) will throws java.util.ConcurrentModificationException, if you remove an
I have many functions which I use in my projects from different classes.Which is the most correct ways to create a helper functions.ThanksAll replies (7)Wednesday, February 18, 2015 9:35 AM ✅Answered | 1 vote1 If your helper library is quite big , you can subcategories into namespace...
Someone just create the file 'example1'. This simple example illustrates how to begin accessing NIO's language facilities in Java. It also introduces NIO.2'sWatcherclass, which is considerably more straightforward and easy-to-use for change notification than the traditional I/O solution based on...
1. String to JSON Object using Gson The Gson is an open-source library to deal with JSON in Java programs. It comes from none other than Google, which is also behind Guava, a common purpose library for Java programmers. You can convert JSON String to Java object in just 2 lines by us...