teaching machines

public class Greeter {
  public static void main(String[] args) {
    String s = "Hello, Merle!";
  }

  public static void greet(String s) {
    System.out.println(s);
  }
}

public class Rectangler {
  public static void main(String[] args) {
    String dimensions = "50x100";
    Scanner in = new Scanner(dimensions);
    in.useDelimiter("x");
    int width = in.nextInt();
    int height = in.nextInt();
    getRectangleArea(width * height);
  }

  public static int getRectangleArea(int width, int height) {
    return width * height;
  }
}

public class RectanglerRedux {
  public static void main(String[] args) {
    int w = 20;
    int h = 10;
    int perimeter = getRectanglePerimeter(w, h);
    System.out.println(perimeter);
  }

  public static int getRectanglePerimeter(int width, int height) {
    width = 30;
    height = 70;
    return 2 * width + 2 * height;
  }
}

public class Ellipsis {
  public static void main(String args) {
    String ellipsis = dots(3);
    System.out.println(ellipsis);
  }

  public static String dots(int n) {
    String lotsOfDots = "............................................";
    String someDots = lotsOfDots.substring(0, n);
    return someDots;
  }
}

public class Growth {
  public static void main(String[] args) {
    int x = 10;
    x = double(x);
    x = double(x);
    x = triple(x);
    System.out.println(x);
  }

  public static int double(int y) {
    return y + y;
  }

  public static int triple(int y) {
    int x = y + y + y;
    return x;
  }
}

public class Half {
  public static void main(String args) {
    String message = "Cursive is character-building";
    int length = message.length();
    System.out.println(halve(length));
  }

  public static double halve(double x) {
    return x / 2;
  }
}

public class Unnamed {
  public static void main(String args) {
    int n = 1834523423;
    int x = unnamed(n);
  }

  public static int unnamed(int z) {
    String zAsString = "" + z;
    String y = zString.replace("2", "");
    int a = zAsString.length() - y.length();
    return a;
  }
}

public class Middle {
  public static void main(String args) {
    char a = 'a';
    char e = 'e';
    char middle = average(a, e);
    System.out.println(middle);
  }

  public static char average(char c1, char c2) {
    return (c1 + c2) / 2;
  }
}

public class Negater {
  public static void main(String[] args) {
    int n = 10;
    negate(n);
    System.out.println(n);
  }

  public static int negate(int n) {
    n = -n;
  }
}

public class Wolves {
  public static void main(String[] args) {
    int x = 4;
    x = wolves(x);
  }

  public static void wolves(int n) {
    n += 30; /* same as n = n + 30 */
  }
}

public class Hide {
  public static void main(String[] args) {
    String puzzle = "Respect covers the empty hole where love should be.";
    puzzle = hide(puzzle, 'e');
    puzzle = hide(puzzle, 't');
    System.out.println(puzzle);
  }

  public static String hide(String message, char letter) {
    message.replace(letter, '_');
    return message; 
  }
}

public class Mousing {
  private static int x = 0;

  public static void main(String[] args) throws AWTException {
    Robot roboto = new Robot();

    int x = 0;
    shift(roboto); 
    shift(roboto); 
    shift(roboto); 
  }

  public static int shift(Robot xj9000) {
    x = x + 10;
    xj9000.mouseMove(x, 0);
    xj9000.delay(3000);
  }
}

public class StringLength {
  public static void main(String[] args) {
    String text = "abc";
    int length = length(text);
    System.out.println(length);
  }

  public static int length(String s) {
    /* s is 'a' + "bc", so the length is 1 + length("bc") */
    return 1 + s.substring(1);
  }
}