Stream map 使用

public static void main(String[] args) {
List l = Lists.newArrayList();
ChartDataView c = new ChartDataView();
for(int i=0;i<5;i++){
c.setDimension1("a"+i);
c.setDimension2("b"+i);
l.add(c);
}
String collect = l.stream().map(v -> v.getDimension1()).collect(Collectors.joining(", "));
System.out.println(collect);

}