渚?/p>
4-1
public
class
ComputerCircleArea {
public
static
void
main (String
args
[ ]){
double
radius
;
double
area
;
radius
=163.16;
area
=3.14*
radius
*
radius
;
System.
out
.printf(
"
鍗婂緞鏄?/p>
%5.3f
鐨勫渾鐨勯潰绉?/p>
:\n%5.3f\n"
,
radius
,
area
);
}
}
渚?/p>
4-2
class
Circle{
double
radius
;
double
getArea(){
double
area
=3.14*
radius
*
radius
;
return
area
;
}
}
public
class
Example4_2 {
public
static
void
main(String[]
args
) {
//
TODO
Auto-generated method stub
Circle
circle
;
circle
=
new
Circle();
circle
.
radius
=163.16;
double
area
=
circle
.getArea();
System.
out
.printf(
"
鍗婂緞鏄?/p>
%5.3f
鐨勫渾鐨勯潰绉?/p>
:\n%5.3f\n"
,
circle
.
radius
,
area
);
}
}
渚?/p>
4-3
class
Lader{
double
above
,
bottom
,
height
;