gistfile1.java

package java112.labs1;

import java.io.*;

/**
 * @author Eric Knapp
 * class DemoIoTwo
 * 
 */
public class DemoIoTwo {
    
    private static final int COMMAND_ARGUMENTS_COUNT_WITH_FILE_NAME = 2;
    
    public void run(String[] arguments) {
        
        if (arguments.length != COMMAND_ARGUMENTS_COUNT_WITH_FILE_NAME) {
            System.out.println("Hey! Add a file name.");
            return;
        }
        
        BufferedReader input = null;
        
        try {
            
            input = new BufferedReader(new FileReader(arguments[0]));
            displaySomeLines(input);
            
        } catch (java.io.FileNotFoundException notFound) {
            notFound.printStackTrace();
        } catch (IOException ioException) {
            ioException.printStackTrace();
        } catch (Exception exception) {
            exception.printStackTrace();
        } finally {
            try {
                if (input != null){
                    input.close();
                }
            } catch (Exception exception) {
                exception.printStackTrace();
            }
            
        }
         
    }
    
    private void displaySomeLines(BufferedReader input) 
            throws IOException, Exception {
        
        String line = null;
        
        while (input.ready()) {
            line = input.readLine();
            System.out.println(line);
        }
    }
    
    
    
    
    
    
    public static void main(String[] args) {
        DemoIoTwo lab = new DemoIoTwo();
        lab.run(args);
    }
    
}