test.java

import java.io.File;
import java.io.FileInputStream;
import javax.swing.JFileChooser;


public class Program
{
	public static void main(String[] args)
	{
		JFileChooser filer = new JFileChooser();
		int i = filer.showOpenDialog(null);
		if(i == 0)
		{
			File file1 = filer.getSelectedFile();
			try
			{
				{
					FileInputStream fin = new FileInputStream(file1);
					for(int k = 0; k < 20; k++)
					{
						int a = fin.read();
						int b = fin.read();
						byte[] bb = new byte[]{(byte)a, (byte)b};
						System.out.print(new String(bb, "SJIS"));
					}
					System.out.println();
					fin.close();
				}
			}
			catch(Exception e)
			{
				e.printStackTrace();
			}
		}
	}

}