I. Concepts

What is a resource? An object that implements java.lang.AutoCloseable or java.io.Closeable is called a resource. Some Java resource classes: - java.io.BufferedReader.BufferedReader - java.net.Socket.Socket - java.sql.Statement ... try-with-resources statement ensures that each resource is closed after completed execution of the statement.

II. Practice

For see benifits of try-with-resources statement, JavaSampleApproach makes an sample with BufferedReader for reading a text file.

1. Use Java6 or early version and Problems

package com.javasampleapproach.trywithresources;
import java.io.BufferedReader;

import java.io.FileReader;

import java.io.IOException;
public class ReadFileByJava6OrEarly {

public static void main(String[] args) {

BufferedReader br = null;

try {

br = new BufferedReader(new FileReader(“C://readfile/input.txt”));

String line;

while (null != (line = br.readLine())) {

// process each line of File

System.out.println(line);

}

} catch (IOException e) {

e.printStackTrace();

} finally {

try {

if (null != br)

br.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

}

More at:

https://grokonez.com/java/java-advanced/java-7-try-with-resources-statement

Java 7 – try-with-resources Statement