Java try with resource statement ~ mkniit

JDK 7 introduces a new version of try statement known as try-with-resources statement. This feature add another way to exception handling with resources management,it is also referred to as automatic resource management.

Syntax

try(resource-specification)
{
//use the resource
}catch()
{...}

This try statement contains a paranthesis in which one or more resources is declare. Any object that implements java.lang.AutoCloseable or java.io.Closeable, can be passed as a parameter to try statement. A resource is an object that is used in program and must be closed after the program is finished. The try-with-resources statement ensures that each resource is closed at the end of the statement, you do not have to explicitly close the resources.

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Example without using try with Resource Statement

import java.io.*;
class Test
{
public static void main(String[] args)
{
try{
String str;
//opening file in read mode using BufferedReader stream
BufferedReader br=new BufferedReader(new FileReader("d:\\myfile.txt"));   
while((str=br.readLine())!=null)
 {
System.out.println(str);
 }      
br.close(); //closing BufferedReader stream
}catch(IOException ie)
{  System.out.println("exception");  }
 }
}

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Example using try with Resource Statement

import java.io.*;
class Test
{
public static void main(String[] args)
{
try(BufferedReader br=new BufferedReader(new FileReader("d:\\myfile.txt")))
{
String str;
while((str=br.readLine())!=null)
{
System.out.println(str);
}
}catch(IOException ie)
{  System.out.println("exception");  }
}
}

NOTE: In the above example, we do not need to explicitly call close() method to close BufferedReader stream.