传递类型的问题

[36387893]

private static void setPointNull(Point p)
{
p = null;
}

public static void main(String[] args)
{
Point p = new Point(2,3);
setPointNull(p);
System.out.print(p);
}
输出为java.awt.Point[x=2,y=3].
请解答,谢谢

[pauliuyou]

private static void setPointNull(Point p)
{
p.x =0;
p.y =0;

}

public static void main(String[] args)
{
Point p = new Point(2,3);
setPointNull(p);
System.out.print(p);
}
至于你想要的功能,只能在同一个方法里实现,不能通过别的方法来实现.

[yy80680169]

UP

[treeroot]

parameters are transfered by value in java!

[classjava]

private static void setPointNull(Point p)
{
p = null;
}

public static void main(String[] args)
{
Point p = new Point(2,3);
setPointNull(p); //这里只是传了一个副本给她
System.out.print(p);
}