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Java example source code file (NullAtEnd.java)
The NullAtEnd.java Java example source code/* * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code 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 General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ /* * @test * @bug 5018254 * @summary Test null-allowing Comparators * @author Martin Buchholz */ import java.util.*; import java.util.concurrent.*; public class NullAtEnd { static volatile int passed = 0, failed = 0; static void fail(String msg) { failed++; new AssertionError(msg).printStackTrace(); } static void pass() { passed++; } static void unexpected(Throwable t) { failed++; t.printStackTrace(); } static void check(boolean condition, String msg) { if (condition) passed++; else fail(msg); } static void check(boolean condition) { check(condition, "Assertion failure"); } private static boolean eq(Object x, Object y) { return x == null ? y == null : x.equals(y); } private static final Comparator<String> NULL_AT_END = new Comparator<String>() { /** * Allows for nulls. Null is greater than anything non-null. */ public int compare(String x, String y) { if (x == null && y == null) return 0; if (x == null && y != null) return 1; if (x != null && y == null) return -1; return x.compareTo(y); } }; public static void main(String[] args) { try { SortedMap<String,String> m1 = new TreeMap<String,String>(NULL_AT_END); check(eq(m1.put("a", "a"), null)); check(eq(m1.put("b", "b"), null)); check(eq(m1.put("c", "c"), null)); check(eq(m1.put(null, "d"), null)); SortedMap<String,String> m2 = new TreeMap Other Java examples (source code examples)Here is a short list of links related to this Java NullAtEnd.java source code file: |
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