// DrJava saved history v2 Tutorial 2 Jan 5, 18:00
44
// int double - types of values
// boolean
false
! fals
! false
!true
// ! is the NOT (negation) operator
AND: (&&)
// AND: (&&)
true && true
false && false
// OR: (||)
fale || true
false || true
5 == 6
// == means "are they equal?"
5 != 6
5 > 6
5 < 6
// Why bother with booleans? One reason: Results of comparions (equal/greater
// than, etc.) are always a boolean value and we very often need to 
// know how things compare (are the tips greater than the minimum wage?)
(4>3) && (4>=5)
(4>3) && (4<=5)
true + false
// Error messages are in red
// Java is very, very careful about types
40 + false
4 && 332
// another type: char
'b'
5.99
(int) 5.99
// int type is narrower than double - every int is (can be
// represented as) a double, but not vice versa
(double) 5
(int) 'b'
(int) 'B'
(int) '$'
(int) ' '
'b' + 'B'
b = 'b' + 'B';
b
// double, int, boolean, char
mikey = 99;
mikey = 99
mikey
'mikey'
"mikey"
// String is indicated by double quotes around a sequence of characters
mikey= mikey + 99;
mikey
foo= false
!foo
mikey - 2
!mikey
!196
// now for something completely different
import javax.swing.*;
j= new JFrame();
j.show();
j.hide();
// j.show() -- a method call on j
j.show();
j.setTitle(" I am a new window");