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Java example source code file (ListTypeCheckTest.java)

This example Java source code file (ListTypeCheckTest.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

arraylist, class, exception, illegalargumentexception, listtypechecktest, management, method, reflection, util

The ListTypeCheckTest.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 6250772
 * @summary Test that *List objects are checked after asList is called.
 * @author Eamonn McManus
 * @run clean ListTypeCheckTest
 * @run build ListTypeCheckTest
 * @run main ListTypeCheckTest
 */

import java.lang.reflect.*;
import java.util.*;
import javax.management.*;
import javax.management.relation.*;

/* For compatibility reasons, the classes AttributeList, RoleList,
 * and RoleUnresolvedList all extend ArrayList<Object> even though
 * logically they should extend ArrayList<Attribute> etc.  They are
 * all specified to have a method asList() with return type
 * List<Attribute> etc, and to refuse to add any object other than
 * an Attribute etc once this method has been called, but not before.
 */
public class ListTypeCheckTest {
    public static void main(String[] args) throws Exception {
        Class[] classes = {
            AttributeList.class, RoleList.class, RoleUnresolvedList.class,
        };
        for (Class c : classes)
            test((Class<? extends ArrayList>) c);
    }

    private static void test(Class<? extends ArrayList> c) throws Exception {
        System.out.println("Testing " + c.getName());
        ArrayList al = c.newInstance();
        test(al);
    }

    private static void test(ArrayList al) throws Exception {
        test(al, true);
        al.clear();
        Method m = al.getClass().getMethod("asList");
        m.invoke(al);
        test(al, false);
    }

    private static void test(ArrayList al, boolean allowsBogus) throws Exception {
        for (int i = 0; i < 5; i++) {
            try {
                switch (i) {
                    case 0:
                        al.add("yo");
                        break;
                    case 1:
                        al.add(0, "yo");
                        break;
                    case 2:
                        al.addAll(Arrays.asList("foo", "bar"));
                        break;
                    case 3:
                        al.addAll(0, Arrays.asList("foo", "bar"));
                        break;
                    case 4:
                        al.set(0, "foo");
                        break;
                    default:
                        throw new Exception("test wrong");
                }
                if (!allowsBogus)
                    throw new Exception("op allowed but should fail");
            } catch (IllegalArgumentException e) {
                if (allowsBogus)
                    throw new Exception("got exception but should not", e);
            }
        }
    }
}

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