Java example source code file (BoundsCheck.java)

This example Java source code file (BoundsCheck.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

boundscheck, bytearrayoutputstream, dummyfilterstream, filteroutputstream, indexoutofboundsexception, ioexception, nullpointerexception, runtimeexception, test

The BoundsCheck.java Java example source code

/*
 * Copyright (c) 1999, 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 4176379
   @summary Ensure that FilterOutputStream.write(byte[], int, int) with
            negative len, throws appropriate exception.
 */

import java.io.*;

public class BoundsCheck {
    static class DummyFilterStream extends FilterOutputStream {

        public DummyFilterStream(OutputStream o) {
            super(o);
        }

        public void write(int val) throws IOException {
            super.write(val + 1);
        }
    }

    public static void main(String[] args) throws Exception {
        byte data[] = {90, 91, 92, 93, 94, 95, 96, 97, 98, 99};
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        DummyFilterStream dfs = new DummyFilterStream(bos);
        boolean caughtException = false;

        // -ve length
        try {
            dfs.write(data, 0, -5);
        } catch (IndexOutOfBoundsException ie) {
            caughtException = true;
        } finally {
            if (!caughtException)
                throw new RuntimeException("Test failed");
        }

        // -ve offset
        caughtException = false;
        try {
            dfs.write(data, -2, 5);
        } catch (IndexOutOfBoundsException ie) {
            caughtException = true;
        } finally {
            if (!caughtException)
                throw new RuntimeException("Test failed");
        }

        // off + len > data.length
        caughtException = false;
        try {
            dfs.write(data, 6, 5);
        } catch (IndexOutOfBoundsException ie) {
            caughtException = true;
        } finally {
            if (!caughtException)
                throw new RuntimeException("Test failed");
        }

        // null data
        caughtException = false;
        try {
            dfs.write(null, 0, 5);
        } catch (NullPointerException re) {
            caughtException = true;
        } finally {
            if (!caughtException)
                throw new RuntimeException("Test failed");
        }
    }
}