绘制面积图,则系列选择面积系列QAreaSeries 需要给系列设置上折线和下折线(QLineSeries),如果没有设置下折线,则默认x轴为下折线
When I try to use java.lang.System.console(), I get a null pointer. I can still write to out and read from in, but this only works when I run straight from my IDE. When I run the .jar file directly, n