/*license*\ XBN-Java: Copyright (C) 2014, Jeff Epstein (aliteralmind __DASH__ github __AT__ yahoo __DOT__ com) This software is dual-licensed under the: - Lesser General Public License (LGPL) version 3.0 or, at your option, any later version; - Apache Software License (ASL) version 2.0. Either license may be applied at your discretion. More information may be found at - http://en.wikipedia.org/wiki/Multi-licensing. The text of both licenses is available in the root directory of this project, under the names "LICENSE_lgpl-3.0.txt" and "LICENSE_asl-2.0.txt". The latest copies may be downloaded at: - LGPL 3.0: https://www.gnu.org/licenses/lgpl-3.0.txt - ASL 2.0: http://www.apache.org/licenses/LICENSE-2.0.txt \*license*/ package com.github.xbn.examples.list.non_xbn; import java.util.ArrayList; import java.util.Arrays; import java.util.List; import java.util.Map; import java.util.TreeMap; /** <p>Adding multiple values per-key in a boolean-keyed map.</p> <p>{@code java com.github.xbn.examples.list.non_xbn.BooleanKeyedMapXmpl}</p> * @since 0.1.0 * @author Copyright (C) 2014, Jeff Epstein ({@code aliteralmind __DASH__ github __AT__ yahoo __DOT__ com}), dual-licensed under the LGPL (version 3.0 or later) or the ASL (version 2.0). See source code for details. <a href="http://xbnjava.aliteralmind.com">{@code http://xbnjava.aliteralmind.com}</a>, <a href="https://github.com/aliteralmind/xbnjava">{@code https://github.com/aliteralmind/xbnjava}</a> **/ public class BooleanKeyedMapXmpl { public static final void main(String[] ignored) { System.out.println("<Boolean,String>:"); Map<Boolean,String> mbs = new TreeMap<Boolean,String>(); mbs.put(true, "hello"); mbs.put(false, "goodbye"); mbs.put(null, "Kermit The Frog"); System.out.println("true: " + mbs.get(true)); System.out.println("false: " + mbs.get(false)); //NullPointerException: //System.out.println("null: " + mbs.get(null)); System.out.println(); System.out.println("<Boolean,ArrayList<String>>:"); Map<Boolean,List<String>> mbls = new TreeMap<Boolean,List<String>>(); mbls.put(true, new ArrayList<String>()); mbls.put(false, new ArrayList<String>()); mbls.put(null, new ArrayList<String>()); List<String> lsTrue = mbls.get(true); lsTrue.add("hello1"); lsTrue.add("hello2"); lsTrue.add("hello3"); lsTrue.add("hello4"); lsTrue.add("hello5"); List<String> lsFalse = mbls.get(false); lsFalse.add("goodbye1"); lsFalse.add("goodbye2"); lsFalse.add("goodbye3"); lsFalse.add("goodbye4"); lsFalse.add("goodbye5"); List<String> lsNull = mbls.get(null); lsNull.add("Kermit The Frog1"); lsNull.add("Kermit The Frog2"); lsNull.add("Kermit The Frog3"); lsNull.add("Kermit The Frog4"); lsNull.add("Kermit The Frog5"); System.out.println("true: " + Arrays.deepToString(lsTrue.toArray())); System.out.println("false: " + Arrays.deepToString(lsFalse.toArray())); System.out.println("false: " + Arrays.deepToString(lsNull.toArray())); } }