File IO Practice

import java.nio.file.Path;
import java.nio.file.Files;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.file.NoSuchFileException;
public class Copy
{
    public static void main(String[] args)
    {

        Path p = Path.of(args[0]);
        //try with resources closes the file for you
        try(
            BufferedReader br = Files.newBufferedReader(p);
        )

        {
            String line = "";
            while( (line = br.readLine()) != null)
            {
                System.out.println(line);
            }
        }
        catch(NoSuchFileException ex)
        {
            System.err.printf("File %s not found.\n", 
               Path.toAbsolutePath(p));
        }
        catch(IOException ex)
        {
            ex.printStackTrace();
        }
    }
}

import java.nio.file.Path;
import java.nio.file.Files;
import java.io.BufferedReader;
import java.io.IOException;
import java.nio.file.NoSuchFileException;
public class WC
{
    public static void main(String[] args)
    {

        Path p = Path.of(args[0]);
        //try with resources closes the file for you
        try(BufferedReader br = Files.newBufferedReader(p);)
        {
            String line = "";
            int words = 0;
            int lines = 0;
            int chars = 0;
            while( (line = br.readLine()) != null)
            {
                //System.out.println(line);
                lines++;
                chars += 1 + line.length();
                words +=  line.split("\\s+").length;
            }
            System.out.printf("chars: %s\n", chars);
            System.out.printf("lines: %s\n", lines);
            System.out.printf("words: %s\n", words);
        }
        catch(NoSuchFileException ex)
        {
            System.err.printf("File %s not found.\n", p);
        }
        catch(IOException ex)
        {
            ex.printStackTrace();
        }
    }
}

import java.util.function.Predicate;
import java.nio.file.Path;
import java.nio.file.Files;
public class Filter
{
    private Predicate predicate;
    private Path filePath;
    public Filter(Predicate predicate, Path filePath)
    {
        this.predicate = predicate;
        this.filePath = filePath;
    }
    /**
     *  Puts all lines for which the predicate evaluates to true
     *  to stdout
     */
    public void  process()
    {
    }
    /**
     *  Puts all lines for which the predicate evaluates to true
     *  to the path specified by dest
     *  @return true if file is written to successfully
     *  and false if it fails.
     */
    public boolean process(Path dest)
    {
        return false;
    }
}

Spelunking Time

Sooprize! It's a small-group project! Groups will be formed using mateFools.py. Savor its delicious source code! It's ancient Python 2, 'cause that's all I have on this server.

#!/usr/bin/env python
from sys import argv
import random
with open(argv[1], "r") as fp:
    roster = fp.readlines()
    random.shuffle(roster)
    roster = [k.strip() for k in roster]
with open("fools.html", "w") as fp :
    fp.write("<table class=\"center-table\">\n")
    fp.write("<tr><th>Partner I</th><th>Partner II</th></tr>\n")
    n = len(roster)
    for k in range(0, 2*(n//2), 2):
        fp.write("<tr><td>%s</td><td>%s</td></tr>\n" %(roster[k], roster[k + 1]))
    fp.write("</table>\n")
    if len(roster) % 2 != 0:
        odd_man_out = roster[len(roster) - 1]
        fp.write("odd man out:  " + odd_man_out + "\n")
        fp.write("random row: %s\n"% (1 + random.choice(range(0, (n//2)))))

Ship of Fools

This table will give the groups. I will run this program right in class.

Here is a little shell code; you can snag it on the left.

import java.nio.file.Path;
import java.nio.file.Files;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.file.NoSuchFileException;
public class Copy
{
    public static void main(String[] args)
    {

        Path p = Path.of(args[0]);
        //try with resources closes the file for you
        try(
            BufferedReader br = Files.newBufferedReader(p);
        )

        {
            String line = "";
            while( (line = br.readLine()) != null)
            {
                System.out.println(line);
            }
        }
        catch(NoSuchFileException ex)
        {
            System.err.printf("File %s not found.\n", 
               Path.toAbsolutePath(p));
        }
        catch(IOException ex)
        {
            ex.printStackTrace();
        }
    }
}