import java.io.*;
import javax.swing.JFileChooser;

public class IO
{    
    public static void print(Object string)
    {
        System.out.print(string);
    }
    
    public static void println(Object string)
    {
        System.out.println(string);
    }
    
    public static String readln() throws IOException
    {
        BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
        return stdin.readLine();
    }
    
    public static String readlnFromFile(String file) throws IOException
    {
        String readedString = "";
        
        try {
            BufferedReader stdin = new BufferedReader(new FileReader(file));
            readedString = stdin.readLine();
        } catch (IOException ex) {
            
        }
        
        return readedString;
    }
    
    public static String readlnFromUserSelectedFile() throws IOException
    {    
        String readedString = "";
        File file;
        
        JFileChooser fileChooser = new JFileChooser();
        fileChooser.setDialogTitle("Select file to read from");
        fileChooser.showOpenDialog(null);
        
        file = fileChooser.getSelectedFile();
        
        try {
            BufferedReader stdin = new BufferedReader(new FileReader(file));
            readedString = stdin.readLine();
        } catch (IOException ex) {
            
        }
        
        return readedString;
    }
    
    public static void writeToFile(String file, String string) throws IOException
    {
        try {
            BufferedWriter stdout = new BufferedWriter(new FileWriter(file));
            stdout.write(string);
            stdout.close();
        } catch (IOException ex) {
            
        }
    }
    
    public static void writeToUserSelectedFile(String string) throws IOException
    {
        File file;
        
        JFileChooser fileChooser = new JFileChooser();
        fileChooser.setDialogTitle("Select file to write to");
        fileChooser.showOpenDialog(null);
        
        file = fileChooser.getSelectedFile();
        
        try {
            BufferedWriter stdout = new BufferedWriter(new FileWriter(file.getName()));
            stdout.write(string);
            stdout.close();
        } catch (IOException ex) {
            
        }
    }
}

public class Test
{
    public static void main(String args[])
    {
        IO.println("Hello!");
    }
}