import com.google.gwt.cell.client.NumberCell; //导入依赖的package包/类
private Column<OrderDataDto, Number> createAmountColumn() {
	return new Column<OrderDataDto, Number>(new NumberCell(numberFormat)) {

		@Override
		public Number getValue(OrderDataDto orderData) {
			return orderData.getAmount();
		}
	};
}
 

import com.google.gwt.cell.client.NumberCell; //导入依赖的package包/类
public UsageColumn() {
	super(new NumberCell());
	setHorizontalAlignment(HasHorizontalAlignment.ALIGN_LOCALE_END);
	setSortable(true);
}
 

import com.google.gwt.cell.client.NumberCell; //导入依赖的package包/类
public IntegerCsvColumn(int col) {
	super(new NumberCell());
	this.col = col;

}