考虑以下代码:
if (xPoint > 0 && yPoint > 0) {
m_navigations = Directions.SouthEast;
}
else if (xPoint > 0 && yPoint < 0) {
m_navigations = Directions.NorthEast;
}
else if (xPoint < 0 && yPoint > 0) {
m_navigations = Directions.SouthWest;
}
else if (xPoint < 0 && yPoint < 0) {
m_navigations = Directions.NorthWest;
}
else if (xPoint == 0 && yPoint < 0) {
m_navigations = Directions.North;
}
else if (xPoint == 0 && yPoint > 0) {
m_navigations = Directions.South;
}
else if (xPoint > 0 && yPoint == 0) {
m_navigations = Directions.East;
}
else if (xPoint < 0 && yPoint == 0) {
m_navigations = Directions.West;
}
这很丑陋,我想使用 switch case ,但我该如何使用switch
with 2
变量?
我想到了类似的事情this- @Frits van Campen 的答案,但我需要使用>
and <
运营商...
Thanks
你可以用枚举做任何事情。我为前两个值创建了示例,您可以继续其余的。
public enum Direction
{
SouthEast(1,1),
NorthEast(1,-1);
int _xPoint, _yPoint;
Direction(int xPoint, int yPoint)
{
_xPoint = xPoint;
_yPoint = yPoint;
}
public static Direction getDirectionByPoints(int xPoint, int yPoint)
{
for (Direction direction : Direction.values())
{
if( Integer.signum(xPoint) == direction._xPoint
&& Integer.signum(yPoint) == direction._yPoint )
{
return direction;
}
}
throw new IllegalStateException("No suitable Direction found");
}
}
所以你可以直接调用:
m_navigations = Direction.getDirectionByPoints(xPoint,yPoint);
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