Whitelist.java


Below is the syntax highlighted version of Whitelist.java.


/******************************************************************************
 *  Compilation:  javac Whitelist.java
 *  Execution:    java Whitelist whitelist.txt < data.txt
 *  Dependencies: StaticSetOfInts.java In.java StdOut.java
 *
 *  Data files:   https://algs4.cs.princeton.edu/11model/tinyW.txt
 *                https://algs4.cs.princeton.edu/11model/tinyT.txt
 *                https://algs4.cs.princeton.edu/11model/largeW.txt
 *                https://algs4.cs.princeton.edu/11model/largeT.txt
 *
 *  Whitelist filter.
 *
 *
 *  % java Whitelist tinyW.txt < tinyT.txt
 *  50
 *  99
 *  13
 *
 *  % java Whitelist largeW.txt < largeT.txt | more
 *  499569
 *  984875
 *  295754
 *  207807
 *  140925
 *  161828
 *  [367,966 total values]
 *
 ******************************************************************************/

package edu.princeton.cs.algs4;

/**
 *  The {@code Whitelist} class provides a client for reading in
 *  a set of integers from a file; reading in a sequence of integers
 *  from standard input; and printing to standard output those 
 *  integers not in the whitelist.
 *  <p>
 *  For additional documentation, see <a href="https://algs4.cs.princeton.edu/12oop">Section 1.2</a> of
 *  <i>Algorithms, 4th Edition</i> by Robert Sedgewick and Kevin Wayne.
 *
 *  @author Robert Sedgewick
 *  @author Kevin Wayne
 */
public class Whitelist {

    // Do not instantiate.
    private Whitelist() { }

    /**
     * Reads in a sequence of integers from the whitelist file, specified as
     * a command-line argument. Reads in integers from standard input and
     * prints to standard output those integers that are not in the file.
     *
     * @param args the command-line arguments
     */
    public static void main(String[] args) {
        In in = new In(args[0]);
        int[] white = in.readAllInts();
        StaticSETofInts set = new StaticSETofInts(white);

        // Read key, print if not in whitelist.
        while (!StdIn.isEmpty()) {
            int key = StdIn.readInt();
            if (!set.contains(key))
                StdOut.println(key);
        }
    }
}

/******************************************************************************
 *  Copyright 2002-2016, Robert Sedgewick and Kevin Wayne.
 *
 *  This file is part of algs4.jar, which accompanies the textbook
 *
 *      Algorithms, 4th edition by Robert Sedgewick and Kevin Wayne,
 *      Addison-Wesley Professional, 2011, ISBN 0-321-57351-X.
 *      http://algs4.cs.princeton.edu
 *
 *
 *  algs4.jar is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  algs4.jar is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with algs4.jar.  If not, see http://www.gnu.org/licenses.
 ******************************************************************************/


Last updated: Sat Nov 18 09:23:11 EST 2017.