Java7 introduced many features that simplifies coding which are overhead in older Java versions. In this blog we will see the feature called Automatic Resource Management.
This is really a good feature in Java7 which close the resources like IO streams automatically. Everything you need to do is implement java.lang.AutoCloseable.
try-with-resources Statement
try-with-resources statement simply has the instantiation of any AutoClosable type in try statement with or without catch/finally block and it will be closed regardless of whether the try statement completes normally or abruptly. For example check the following code:
public String readMyFile(String path) throws IOException{
try(BufferReader reader=new BufferedReader(new FileReader(path)){
return reader.readLine()
}
}
The java.io.BufferedReader in Java 7 or later, implements the interface java.lang.AutoCloseable so that it will be automatically closed once the execution is done.
Note: A try-with-resources statement can have catch and finally blocks just like an ordinary try statement. In a try-with-resources statement, any catch or finally block is run after the resources declared have been closed.