3

CHAPTER

we examined enough Java syntax to be able to construct
application classes using assignment and simple input and output, and
to write a user class within an application. In that chapter, we focused on
the charand Stringtypes and saw how to construct expressions using the
concatenation operator. In this chapter, we continue to write applications
that use assignment and simple I/O, but we concentrate on additional
built-in data types: int,long,float, and double. These numeric types
include multiple operators that enable us to construct complex arith-
metic expressions. We show how to make expressions even more
powerful by using calls to Java’s value-returning math methods. In addi-
tion, we return to the topics of classes and methods and see how to write
a non-application class that includes a class as well as instance fields and
methods. Such classes can be stored in files separate from the applica-
tion and imported into it.

In Chapter 2,

1937

George Stibitz

develops the “Model

K,” the prototype

binary adder circuit

1937

Alan Turing

introduces the idea

of his “Turing

Machine” a

theoretical model

for a general

purpose computer

1938

Bill Hewlett and

Dave Packard begin

Hewlett-Packard in

a garage with $538

in capitol

1939

John Vincent

Atanasoff and Cliff

Berry create a

model for the

electronic-digital

computer

1943

Construction of the

ENIAC (Electronic

Numerical Integrator

and Computer)

begins at the Moore

School of Electrical

Engineering in

Philadelphia

1943

Invention of the first

all-electronic

calculating device,

the Collosus, used

by England during

World War II to

decrypt secret

messages