Here you can find the source of toJson()
public static String toJson()
//package com.java2s; /*/* ww w.j a va 2s .c om*/ * Copyright 2007-2011 Nicolas Zozol * * 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 { /** * Problem of Json is that we need to distinguish * @return */ public static String toJson() { throw new UnsupportedOperationException("Not supported yet."); } }