BLOCKS AND STATEMENTS

The

while

 Statement

14.10

class Twomany {

static void howMany(int k) {

switch (k) {

case 1:

System.out.println("one");

break;

//

exit the switch

case 2:

System.out.println("two");

break;

//

exit the switch

case 3:

System.out.println("many");

break;

//

not needed, but good style

}

}

public static void main(String[] args) {

howMany(1);

howMany(2);

howMany(3);

}

}

This program prints:

one

two

many

14.10   The

while

 Statement

The

while

 statement executes an

Expression

 and a

Statement

 repeatedly until the

value of the

Expression

 is

false

.

WhileStatement:

while (

Expression

 )

Statement

WhileStatementNoShortIf:

while (

Expression

 )

StatementNoShortIf

The

Expression

 must have type

boolean

, or a compile time error occurs.

A

while

 statement is executed by first evaluating the

Expression

. If evalua 

tion of the

Expression

 completes abruptly for some reason, the

while

 statement

completes abruptly for the same reason. Otherwise, execution continues by mak 

ing a choice based on the resulting value:

If the value is

true

, then the contained

Statement

 is executed. Then there is a

choice:

N

If execution of the

Statement

 completes normally, then the entire

while

statement is executed again, beginning by re evaluating the

Expression

.

277