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Java example source code file (CheckedQueue.java)

This example Java source code file (CheckedQueue.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

arrayblockingqueue, checkedqueue, classcastexception, exception, illegalstateexception, integer, method, nullpointerexception, object, reflection, string, threading, threads, util

The CheckedQueue.java Java example source code

/*
 * Copyright (c) 2011, 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 5020931
 * @summary Unit test for Collections.checkedQueue
 */

import java.lang.reflect.Method;
import java.util.Collections;
import java.util.Iterator;
import java.util.Queue;
import java.util.concurrent.ArrayBlockingQueue;

public class CheckedQueue {
    static int status = 0;

    public static void main(String[] args) throws Exception {
        new CheckedQueue();
    }

    public CheckedQueue() throws Exception {
        run();
    }

    private void run() throws Exception {
        Method[] methods = this.getClass().getDeclaredMethods();

        for (int i = 0; i < methods.length; i++) {
            Method method = methods[i];
            String methodName = method.getName();

            if (methodName.startsWith("test")) {
                try {
                    Object obj = method.invoke(this, new Object[0]);
                } catch(Exception e) {
                    throw new Exception(this.getClass().getName() + "." +
                            methodName + " test failed, test exception "
                            + "follows\n" + e.getCause());
                }
            }
        }
    }

    /**
     * This test adds items to a queue.
     */
    private void test00() {
        int arrayLength = 10;
        ArrayBlockingQueue<String> abq = new ArrayBlockingQueue(arrayLength);

        for (int i = 0; i < arrayLength; i++) {
            abq.add(new String(Integer.toString(i)));
        }
    }

    /**
     * This test tests the CheckedQueue.add method.  It creates a queue of
     * {@code String}s gets the checked queue, and attempt to add an Integer to
     * the checked queue.
     */
    private void test01() throws Exception {
        int arrayLength = 10;
        ArrayBlockingQueue<String> abq = new ArrayBlockingQueue(arrayLength + 1);

        for (int i = 0; i < arrayLength; i++) {
            abq.add(new String(Integer.toString(i)));
        }

        Queue q = Collections.checkedQueue(abq, String.class);

        try {
            q.add(new Integer(0));
            throw new Exception(this.getClass().getName() + "." + "test01 test"
                    + " failed, should throw ClassCastException.");
        } catch(ClassCastException cce) {
            // Do nothing.
        }
    }

    /**
     * This test tests the CheckedQueue.add method.  It creates a queue of one
     * {@code String}, gets the checked queue, and attempt to add an Integer to
     * the checked queue.
     */
    private void test02() throws Exception {
        ArrayBlockingQueue<String> abq = new ArrayBlockingQueue(1);
        Queue q = Collections.checkedQueue(abq, String.class);

        try {
            q.add(new Integer(0));
            throw new Exception(this.getClass().getName() + "." + "test02 test"
                    + " failed, should throw ClassCastException.");
        } catch(ClassCastException e) {
            // Do nothing.
        }
    }

    /**
     * This test tests the Collections.checkedQueue method call for nulls in
     * each and both of the parameters.
     */
    private void test03() throws Exception {
        ArrayBlockingQueue<String> abq = new ArrayBlockingQueue(1);
        Queue q;

        try {
            q = Collections.checkedQueue(null, String.class);
            throw new Exception(this.getClass().getName() + "." + "test03 test"
                    + " failed, should throw NullPointerException.");
        } catch(NullPointerException npe) {
            // Do nothing
        }

        try {
            q = Collections.checkedQueue(abq, null);
            throw new Exception(this.getClass().getName() + "." + "test03 test"
                    + " failed, should throw NullPointerException.");
        } catch(Exception e) {
            // Do nothing
        }

        try {
            q = Collections.checkedQueue(null, null);
            throw new Exception(this.getClass().getName() + "." + "test03 test"
                    + " failed, should throw NullPointerException.");
        } catch(Exception e) {
            // Do nothing
        }
    }

    /**
     * This test tests the CheckedQueue.offer method.
     */
    private void test04() throws Exception {
        ArrayBlockingQueue<String> abq = new ArrayBlockingQueue(1);
        Queue q = Collections.checkedQueue(abq, String.class);

        try {
            q.offer(null);
            throw new Exception(this.getClass().getName() + "." + "test04 test"
                    + " failed, should throw NullPointerException.");
        } catch (NullPointerException npe) {
            // Do nothing
        }

        try {
            q.offer(new Integer(0));
            throw new Exception(this.getClass().getName() + "." + "test04 test"
                    + " failed, should throw ClassCastException.");
        } catch (ClassCastException cce) {
            // Do nothing
        }

        q.offer(new String("0"));

        try {
            q.offer(new String("1"));
            throw new Exception(this.getClass().getName() + "." + "test04 test"
                    + " failed, should throw IllegalStateException.");
        } catch(IllegalStateException ise) {
            // Do nothing
        }
    }

    private void test05() {

    }
}

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