9

CHAPTER

this book we have said that a construct could
cause an exception. Until now, we have handled exceptions by forwarding
them to “someone else.” In this chapter, we stop passing the buck and ex-
amine how to handle exceptions within our code. We also show you how
to generate exceptions of your own.
In Chapters 4 and 5, we introduced the Java statements for the se-
lection and loop control structures. In some cases, we considered more
than one way of implementing these structures. For example, selection
may be implemented by an ifstructure. Although the if-(then)is suffi-
cient to implement any selection structure, Java also provides the if-else
for the sake of convenience—the two-way branch is used frequently in
programming.
This chapter introduces several new statements that are also
nonessential to, but nonetheless convenient for, programming. The switch
statement makes it easier to write selection structures that have many
branches. Two new looping statements,forand do, make it easier to pro-
gram certain types of loops. The breakand continuestatements are con-
trol statements that are used as part of larger looping and selection
structures.
Finally, we examine the remaining operators in Java and study their
place in the precedence hierarchy.

Several times throughout

1972

Steve Wozniak

makes free phone

calls using his

invention, the “blue

box”

1973

Xerox PARC’s

experimental Alto

personal computer,

featuring a mouse,

a graphical user

interface, and

connection to a local

area network,

becomes operational

1973

Ten thousand

components are

placed on a 1-

square-cm chip

through large-scale

integration

1973

Eckert and

Mauchley’s ENIAC

patent is invali-

dated, and John

Vincent Atanasoff is

federally recognized

as the inventor of

the modern

computer

1974

Charles Simonyi

writes the first

WYSIWYG (“What

You See Is What

You Get”) program

entitled Bravo

1974

The first World

Computer Chess

Tournament takes

place in Stockholm;

the winner is the

program Kaissa