Java 8 has introduced a new way to loop over a List or Collection, by using the forEach() method of the new Stream class. You can iterate over any Collection e.g. List, Set, or Map by converting them into a java.util.sttream.Stream instance and then calling the forEach() method. This method performs given operation on every element of Stream, which can be either simply printing it or doing something else. Since stream can be sequential or parallel, the behavior of if this method is not deterministic if used with a parallel stream. One more thing to remember about the forEach() method is that it's a terminal operation, which means you cannot reuse the Stream after calling this method. It will throw IllegalStateException if you try to call another method on this Stream.
How to read File into String in Java 7, 8 with Example
Many times you want to read contents of a file into String, but, unfortunately, it was not a trivial job in Java, at least not until JDK 1.7. In Java 8, you can read a file into String in just one line of code. Prior to the release of new File IO API, you have to write a lot of boilerplate code e.g. open an input stream, convert that input stream into a Reader, and then wrap that into a BufferedReader and so on. Of course, JDK 1.5's Scanner class did provide some breathing space but it was still not as simple as it should be, like in Python or Ruby. By using Java 7 new File API and Java 8's new features like lambda expression and stream API, Java is now close to Python or other utility languages, when it comes to reading the file into String.
3 Examples of Parsing HTML File in Java using Jsoup
HTML is the core of the web, all the pages you see on the internet are HTML, whether they are dynamically generated by JavaScript, JSP, PHP, ASP or any other web technology. Your browser actually parse HTML and render it for you. But what would you do, if you need to parse an HTML document and find some elements, tags, attributes or check if a particular element exists or not from Java program. If you have been in Java programming for some years, I am sure you have done some XML parsing work using parsers like DOM and SAX, but there is also good chance that you have not done any HTML parsing work. Ironically, there are few instances when you need to parse HTML documents from core Java application, which doesn't include Servlet and other Java web technologies.
Maven JAR Artifiact Dependency Search Not Working in Eclipse - Solved
Recently I face a strange issue while using Maven in Eclipse via M2Eclipse plugin. I have created a Maven Java project in Eclipse and subsequently tried to add Spring framework as a dependency, to my surprise, nothing was happening. Eclipse was not able to search dependency in Maven central repository. I was surprised because I have never faced this issue while I was using the M2Eclipse plugin for a long time. After some trial and error, I realized that this is my brand new workspace and I am running with Eclipse Luna, the newest version of Eclipse which I had just downloaded a couple days of the back. My first hunch was that Eclipse might not able to connect to the Internet, and to verify that I tried connecting the Eclipse market place, and boom it was working fine.
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