» CS 145 Lecture 21 – 2-D arrays, Image

CS 145 Lecture 21 – 2-D arrays, Image

April 20, 2012 by Chris Johnson. Filed under cs145, lectures, spring 2012.

Agenda

2-D arrays (or arrays of arrays)
writing an image
portable graymap

Code

Birthday2.java

package preexam2;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class Birthday2 {

  public static void main(String[] args) throws FileNotFoundException {

    File file = new File("/home/user/bdays.csv");
    Scanner in = new Scanner(file);

    int[][] counters = new int[12][31];

    while (in.hasNextInt()) {
      int month = in.nextInt();
      int day = in.nextInt();

      ++counters[month - 1][day - 1];
    }

    in.close();

    for (int m = 0; m < counters.length; ++m) {
      for (int d = 0; d < counters[m].length; ++d) {
        if (counters[m][d] > 1) {
          System.out.println("we've a repeat at " + (m + 1) + "/" + (d + 1) + "!");
        }
      }
    }

//    for (int i = 0; i < counters.length; ++i) {
//      if (counters[i] > 1) {
//        System.out.println("we've a repeat at " + i + "!");
//        System.out.println("That is " + indexToMonthDay(i));
//      }
//    }

  }
}

Artiste.java

package prefinal;

import java.io.FileNotFoundException;

public class Artiste {
  public static void main(String[] args) throws FileNotFoundException {
    Image image = new Image(480, 320);

    image.noise();

    image.writeToPGM("/home/user/blarb.pgm");
  }
}