// DrJava saved history v2
3 + 8
// The line above is a java expression.
// This is a comment.  Java ignores lines starting with //
7 + 9
3 * 6
5 / 3
// That is not the result that we expect!
// Java has different types.  In the expression above,
// the operands are integers, so the result is an integer.
8 / 2
5.0 / 3.0
5.0 / 3
3 + 7.0 / 3
// Java has an order of precedence for the operations
// Java has 8 primitive types.
// Two of the Java types: int and double
true
jen
false
// another type: boolean
// two values: true, false
true && false
// &&: AND operator
// evaluates to true if both operands are true,
// and false otherwise
true && true
// ||: OR operator
true || false
false || true
true || true
// || evalates to true if at least of the operands 
// is true, and evaluates to false otherwise
true && 9
true && 1
// !: NOT
!true
!false
!true || false || true
!(true || false) || false
// use parentheses to specify the order of precedence
a
'a'
// 'a' is an example of a character literal
'z'
// this is another type: char
')'
"this is a String"
'a' + 'p'
(int) 'a'
// the expression above converts a char to an int
(char) 97
// This conversion from one type to another is called typecasting.
// The types so far: int, double, boolean, char
1.0 / 3.0
1.0f / 3.0f
// This type is called float.  double has twice as many
// significant digits as float.
1.0 / 3.0f
(float) 1.0 / 3.0f
7.0 / 3