JDK 7 introduces a try -with-resources statement, which ensures that each of the resources in try resources is properly closed at the end of the statement.
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This results in cleaner codes. By default, literal values are 'int'.
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Long literals requires suffix "L". The try -with-resources construct Before JDK 7, we need to use a try-catch-finally construct to manage resources. For example, import java.
FileReader; import java. FileWriter; import java. BufferedReader; import java. BufferedWriter; import java.
What's new for Java 7
Latest version tested: JDK 1. Cleanup happens because of new interface AutoCloseable. Its close method is invoked by JVM as soon as try block finishes. You are not supposed to call close method in your code. This should be called automatically bu JVM. Calling it manually may cause unexpected results. Java SE 7 introduced java.
JDK 1.7 Features
Path class has been a big addition which allow you to represent any path in operating system in uniform way. New APIs complements older one and provides several useful method checking, deleting, copying, and moving files. You can also create symbolic links and hard links like in linux. You also get support to watch a directory for changes. Java 7 has brought some nice enhancements in exception handling as well.
Strings in Switch:
These can be broadly divided into two features:. Suppressed exceptions, as name suggest, are exceptions thrown in the code but were ignored somehow. If you remember try-catch-finally block execution sequence and how they return any value or exceptions, you will recall that exceptions thrown in finally block are suppressed is exception is thrown in try block also.
With new features in java 7 you got control over these suppressed exceptions as well. In this feature, now you can catch multiple exceptions in single catch block. Before java 7, you was restricted to catch only one. Not much, right??
New features in java 7 - Stack Overflow
We have a habit of reading numbers in 10,00, format. Good news is that java has started supporting to write numbers in this format. Well, not exactly this but a matching format. If you remember the switch statement before java 7, it supported only int and enum types. Now with java 7 release, support for String class has also been added. Lets see using an example. The effective use of parallel cores in a Java program has always been a challenge. There were few home-grown frameworks that would distribute the work across multiple cores and then join them to return the result set.
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Java 7 has incorporated this feature as a Fork and Join framework. Basically the Fork-Join breaks the task at hand into mini-tasks until the mini-task is simple enough that it can be solved without further breakups. One important concept to note in this framework is that ideally no worker thread is idle.
They implement a work-stealing algorithm in that idle workers steal the work from those workers who are busy.