Java example source code file (T6238612.java)

This example Java source code file (T6238612.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

error, string, t6238612

The T6238612.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
 * @summary com.sun.tools.util.List.toArray violates Collection spec
 */

import com.sun.tools.javac.util.List;

public class T6238612 {
    public static void main(String... args) {
        new T6238612().test();
    }

    boolean error = false;

    // exercise the List.toArray method for a variety of lists
    void test() {
        test(List.<String>nil());
        test(List.of("a"));
        test(List.of("a", "b", "c"));
        test(List.of("a", "b", "c", "d", "e", "f"));
        if (error)
            throw new Error("test failed");
    }

    // given a list, exercise the List.toArray method for a variety of arrays
    void test(List<String> list) {
        int n = list.size();
        if (n > 0)
            test(list, new String[0]);

        if (n > 1)
            test(list, new String[n - 1]);

        test(list, new String[n]);
        test(list, new String[n + 1]);
        test(list, new String[n + 5]);
    }

    // test the List.toArray method for a particular list and array
    void test(List<String> list, String[] array) {
        String[] result = list.toArray(array);

        if (result.length < list.size()) {
            error("returned array is too small; expected: " + list.size() + ", found: " + result.length);
            return;
        }

        if (list.size() <= array.length && result != array)
            error("new array wrongly created");

        int i = 0;
        for (String s: list)
            check(result, i++, s);

        if (i < result.length)
            check(result, i, null);
    }

    // check a specific element of an array
    void check(String[] array, int i, String expected) {
        if (!equal(array[i], expected))
                error("element " + i + " incorrect; expected: " + str(expected) + ", found: " + str(array[i]));
    }

    // check if two strings are both null or are equal
    boolean equal(String s1, String s2) {
        return (s1 == null ? s2 == null : s1.equals(s2));
    }

    String str(String s) {
        return (s == null ? "null" : '"' + s + '"');
    }

    void error(String message) {
        System.err.println(message);
        error = true;
    }
}