Java tutorial
package mrcg.domain; /* * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.util.ArrayList; import java.util.List; import org.apache.commons.lang.StringUtils; public class Index { private List<String> columns = new ArrayList<String>(); public void addColumn(String column) { columns.add(column); } public void addColumns(List<Object> list) { for (Object o : list) addColumn(o.toString()); } public String getName() { return StringUtils.join(columns, "_"); } public String getColumnList() { return StringUtils.join(columns, "_"); } }