> '\t' == '\12'
true

> 123456789
123456789

> 123456789123456789
NumberFormatException: For input string: "123456789123456789"
  at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
  at java.lang.Integer.parseInt(Integer.java:459)
  at java.lang.Integer.valueOf(Integer.java:553)

> 2 == '2'
false

> 2 == (int) '2'
false

> (int) '2'
50

> ' ' != (char) 32
false


[.....  try several of the above with variable x  .....]

ABSTRACTION -- A _TYPE_ OF THING
int      32 bits  ... 2^32 integers ... -2^31 .. 2^31-1
double   64 bits
char     16 bits
boolean   1 bit?! ... undefined!  usually 8 bits

> Integer.MAX_VALUE              // a name!!  actually, two
2147483647

> Integer.MAX_VALUE + 1
-2147483648

> String instructor;
> System.out.println( instructor );
null
> instructor = "Eugene";
> System.out.println( instructor );
Eugene
> String lastName = new String( "Wallingford" );
> System.out.println( lastName );
Wallingford




> instructor.charAt( 4 );
> System.out.println( instructor.charAt(4) );
n
> System.out.println( instructor.indexOf('e') );
3




> String filename = "/Users/wallingf/Desktop/numb3rs-logo.jpg";
> Picture picture = new Picture( filename );
> picture.show();
> picture.negate();
> picture.show();
> picture.clearBlue();
> picture.show();
> picture.makeGrayscale();
> picture.show();




Pixel p = picture.getPixels()[0][0];
int red   = p.getRed();
int green = p.getGreen();
int blue  = p.getBlue();

int intensity = (red + blue + green) / 3;