test/java/util/Collections/CheckedListReplaceAll.java

/*
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 * 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.
 *
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 */

/*
 * @test
 * @bug     8047795 8053938
 * @summary Ensure that replaceAll operator cannot add bad elements
 * @author  Mike Duigou
 */

import java.util.*;
import java.util.function.UnaryOperator;

public class CheckedListReplaceAll {
    public static void main(String[] args) {
        List unwrapped = Arrays.asList(new Object[]{1, 2, 3});
        List<Object> wrapped = Collections.checkedList(unwrapped, Integer.class);

        UnaryOperator evil = e -> (((int) e) % 2 != 0) ? e : "evil";

        try {
            wrapped.replaceAll(evil);
            System.out.printf("Bwahaha! I have defeated you! %s\n", wrapped);
            throw new RuntimeException("String added to checked List<Integer>");
        } catch (ClassCastException thwarted) {
            thwarted.printStackTrace(System.out);
            System.out.println("Curses! Foiled again!");
        }

        unwrapped = Arrays.asList(new Object[]{});  // Empty list
        wrapped = Collections.checkedList(unwrapped, Integer.class);
        try {
            wrapped.replaceAll((UnaryOperator)null);
            System.out.printf("Bwahaha! I have defeated you! %s\n", wrapped);
            throw new RuntimeException("NPE not thrown when passed a null operator");
        } catch (NullPointerException thwarted) {
            thwarted.printStackTrace(System.out);
            System.out.println("Curses! Foiled again!");
        }
    }
}