import com.vaadin.data.util.DefaultItemSorter; //导入依赖的package包/类
@SuppressWarnings("serial")
public static ItemSorter getCaseInsensitiveItemSorter() {
    return new DefaultItemSorter(new DefaultPropertyValueComparator() {

        @Override
        public int compare(Object o1, Object o2) {
            if ((o1 instanceof String) && (o2 instanceof String)) {
                return ((String) o1).compareToIgnoreCase((String) o2);
            } else {
                return super.compare(o1, o2);
            }
        }
    });
}
 

import com.vaadin.data.util.DefaultItemSorter; //导入依赖的package包/类
public DemoItemSorter() {
    super(new DefaultItemSorter.DefaultPropertyValueComparator());
}
 

import com.vaadin.data.util.DefaultItemSorter; //导入依赖的package包/类
@Override
public void sort(Object[] propertyId, boolean[] ascending) {
	ItemSorter itemSorter = new DefaultItemSorter();
       itemSorter.setSortProperties((Sortable) this, propertyId,ascending);
       Collections.sort(this.items, itemSorter);
}