-1

我正在做一个来自 coursera 的作业，我正在编写一张地图，该地图显示标记以指出发生地震的地点。因此，如果地震发生在 2000 年之后，我想将标记的颜色更改为黄色，如果在 2000 年之前，我想将标记的颜色更改为灰色2000.在我的代码中，我使用 PointFeature 作为 ArrayList 中的数据类型，它存储诸如年份到标记改变颜色的信息。我正在使用展开地图。

 List<PointFeature> bigEqs = new ArrayList<PointFeature>();
 Location valLoc = new Location(-38.14f,-73.03f);   
 Feature valEq = new PointFeature(valLoc);
 bigEqs.add((PointFeature) valEq);
 valEq.addProperty("title", "Valvidivia,Chile");
 valEq.addProperty("magnitude","9.5");
 valEq.addProperty("date", "May 22,1960");
 valEq.addProperty("year", "1960");
      
 Location valLoc1 = new Location(60.59f,-147.848f);
 Feature alaskaEq = new PointFeature(valLoc1);
 bigEqs.add((PointFeature) alaskaEq);
 alaskaEq.addProperty("title", "Prince William Sound ,Southern Alaska");
 alaskaEq.addProperty("magnitude","9.2");
 alaskaEq.addProperty("date", "March 28,1964");
 alaskaEq.addProperty("year", "1964");
   
 Location valLoc2 = new Location(3.30f,95.98f);
 Feature sumantraEq = new PointFeature(valLoc2);
 bigEqs.add((PointFeature) sumantraEq);
 sumantraEq.addProperty("title", "Sumatra-Andaman Islands ");
 sumantraEq.addProperty("magnitude", " 9.1");
 sumantraEq.addProperty("date", " December 26,2004");
 sumantraEq.addProperty("year", " 2004");
   
   
 Location valLoc3 = new Location(38.30f,142.37f);
 Feature japanEq = new PointFeature(valLoc3);
 bigEqs.add((PointFeature) japanEq);
 japanEq.addProperty("title", "Tohuku(Eastern coast of Honshu) ,Japan");
 japanEq.addProperty("magnitude", " 9.1");
 japanEq.addProperty("date", "November 3 , 2011 ");
 japanEq.addProperty("year", "2011 ");
   
 Location valLoc4 = new Location(52.62f,159.78f);
 Feature kamchatkaEq = new PointFeature(valLoc4);
 bigEqs.add((PointFeature) kamchatkaEq);
 kamchatkaEq.addProperty("title", "Kamchatka,Russia ");
 kamchatkaEq.addProperty("magnitude", " 9.0");
 kamchatkaEq.addProperty("date", "April 24,1952 ");
 kamchatkaEq.addProperty("year", " 1952");
 
 List<Marker> markers1 = new ArrayList<Marker>();
 for(PointFeature eq:bigEqs) {
       markers1.add(new SimplePointMarker(eq.getLocation(),eq.getProperties()));
       
  }  for(Marker mk:markers1) {
     if(  mk.getProperty("year")>2000) {
         mk.setColor(color(255,255,0));
     }else {
         mk.setColor(color(128,128,128));
     }
     map.addMarker(mk);
 }

但它显示错误：它不能在这里将 obj 转换为 int，if( mk.getProperty("year")>2000)

4

1 回答 1

1

由于年份是一个数字，因此如果将其解析为 int 它将起作用。

例子：

if(Integer.parseInt(mk.getProperty("year"))>2000)

这将起作用。

于 2020-06-27T01:33:51.960 回答