Java Reference
In-Depth Information
import java .awt.geom. ;
class Square extends Rectangle2D .Double
{
private boolean isX = false ;
private boolean isO = false ;
public boolean isCharacter( char c)
{
if (c == 'x' )
{
return isX;
if (c == 'o' )
{
return isO;
return false ;
}
public void placeCharacter( char c)
{
if (c == 'x' )
{
isX = true ;
isO = false ;
if (c == 'o' )
{
isO = true ;
isX = false ;
}
}
public void clear()
{
isX = false ;
isO = false ;
}
public boolean hasValue()
{
return (isX ||
isO) ;
}
{
public Square( double x, double y, double dx , double dy)
super (x, y, dx, dy) ;
}
public void draw(Graphics2D g2 , Image xImage , Image oImage)
{
g2 . draw( super . getBounds2D() ) ;
if (isX) {
g2 . drawImage(xImage , ( int )getX()+1,( int )getY()+1,( int )
getWidth() 2, ( int )getHeight() 2, null );
if (isO) {
g2 . drawImage(oImage , ( int )getX()+1,( int )getY()+1,( int )
getWidth() 2, ( int )getHeight() 2, null );
}
}
}
The class keeps track of two Boolean variables that determine if the square is an X and
if the square is an O . Note that we could not have created just a single Boolean variable
because we have three states: the square is an X ,itisan O , and it is empty. The isCharacter

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