Java tutorial
//package com.java2s; /* * Copyright (C) 2011-2015 Markus Junginger, greenrobot (http://greenrobot.de) * * 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. */ public class Main { public static StringBuilder appendColumns(StringBuilder builder, String tableAlias, String[] columns) { int length = columns.length; for (int i = 0; i < length; i++) { appendColumn(builder, tableAlias, columns[i]); if (i < length - 1) { builder.append(','); } } return builder; } public static StringBuilder appendColumns(StringBuilder builder, String[] columns) { int length = columns.length; for (int i = 0; i < length; i++) { builder.append('"').append(columns[i]).append('"'); if (i < length - 1) { builder.append(','); } } return builder; } public static StringBuilder appendColumn(StringBuilder builder, String column) { builder.append('"').append(column).append('"'); return builder; } public static StringBuilder appendColumn(StringBuilder builder, String tableAlias, String column) { builder.append(tableAlias).append(".\"").append(column).append('"'); return builder; } }