JAVA EE: Java Tutorial : Java Exception handling (Specifying the exceptions thrown by a method)

Thursday 30 June 2016

Java Tutorial : Java Exception handling (Specifying the exceptions thrown by a method)

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Java Tutorial : Java Exception handling (Specifying the exceptions thrown by a method)

ThorwsDemo.java

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

public class ThorwsDemo
{

    public static void main(String[] args)
    {
        ThorwsDemo throwsDemo = new ThorwsDemo();

        try
        {
            String firstLine = throwsDemo
                    .readFirstLineFromFile("myfile.txt");
            System.out.println("firstLine = " + firstLine);
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }

    }

    public String readFirstLineFromFile(String path)
            throws IOException

    {
        BufferedReader br = new BufferedReader(new FileReader(path));
        String line = br.readLine();
        br.close();
        return line;
    }

}

Output

java.io.FileNotFoundException: myfile.txt (The system cannot find the file specified)
    at java.io.FileInputStream.open0(Native Method)
    at java.io.FileInputStream.open(FileInputStream.java:195)
    at java.io.FileInputStream.<init>(FileInputStream.java:138)
    at java.io.FileInputStream.<init>(FileInputStream.java:93)
    at java.io.FileReader.<init>(FileReader.java:58)
    at ThorwsDemo.readFirstLineFromFile(ThorwsDemo.java:29)
    at ThorwsDemo.main(ThorwsDemo.java:15)