JAVA EE: Java Tutorial : Java Exception handling (The Try with resources statement)

Thursday, 30 June 2016

Java Tutorial : Java Exception handling (The Try with resources statement)

Click here to watch in Youtube :
https://www.youtube.com/watch?v=NmAH9C2O9gg&list=UUhwKlOVR041tngjerWxVccw

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Java Tutorial : Java Exception handling (The Try with resources statement)

TryWithResourcesDemo.java

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class TryWithResourcesDemo
{

    public static void main(String[] args) throws Exception
    {
        TryWithResourcesDemo tryWithResourcesDemo = new TryWithResourcesDemo();
        String firstLine = tryWithResourcesDemo.readFirstLineFromFile("myfile.txt");
        System.out.println("firstLine = "+firstLine);
            
    }

    public String readFirstLineFromFile(String path)
            throws IOException
    {
        try (BufferedReader br = new BufferedReader(new FileReader(
                path)))
        {
            return br.readLine();
        }
    }

}

Output

firstLine = Peter

FinallyDemo.java

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class FinallyDemo
{

    public static void main(String[] args) throws IOException
    {
        FinallyDemo finallyDemo = new FinallyDemo();
        String firstLine = finallyDemo.readFirstLineFromFile("myfile.txt");
        System.out.println("firstLine = "+firstLine);

    }
    
    public String readFirstLineFromFile(String path)
            throws IOException
    {
        BufferedReader br = new BufferedReader(new FileReader(path));
        try
        {
            return br.readLine();
        }
        finally
        {
             if (br != null)
             {
                 br.close();
             }
        }
    }
}