Here you can find the source of toString(Object object, String nullStr)
public static String toString(Object object, String nullStr)
//package com.java2s; /**//from w ww. j a v a 2s . c o m * Copyright (c) 2015 The Solmix Project * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This software is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * http://www.gnu.org/licenses/ * or see the FSF site: http://www.fsf.org. */ import java.util.Arrays; public class Main { public static String toString(Object object) { return toString(object, ""); } public static String toString(Object object, String nullStr) { if (object == null) { return nullStr; } else if (object instanceof Object[]) { return Arrays.deepToString((Object[]) object); } else if (object instanceof int[]) { return Arrays.toString((int[]) object); } else if (object instanceof long[]) { return Arrays.toString((long[]) object); } else if (object instanceof short[]) { return Arrays.toString((short[]) object); } else if (object instanceof byte[]) { return Arrays.toString((byte[]) object); } else if (object instanceof double[]) { return Arrays.toString((double[]) object); } else if (object instanceof float[]) { return Arrays.toString((float[]) object); } else if (object instanceof char[]) { return Arrays.toString((char[]) object); } else if (object instanceof boolean[]) { return Arrays.toString((boolean[]) object); } else { return object.toString(); } } }