java CheckerApplet 类的 init() 方法和私有的 parseSquareSize() 方法：
public
void
init
(
)
{
String
squareSizeParam
=
getParameter
(
"
squareSize
"
)
;
parseSquareSize
(
squareSizeParam
)
;
String
colorParam
=
getParameter
(
"
color
"
)
;
Color
fg
=
parseColor
(
colorParam
)
;
setBackground
(
Color
.
black
)
;
setForeground
(
fg
)
;
}
private
void
parseSquareSize
(
String
param
)
{
if
(
param
==
null
)
return
;
try
{
squareSize
=
Integer
.
parseInt
(
param
)
;
}
catch
(
Exception
e
)
{
//
保留默认值
}
}