Java example source code file (Decode.java)

This example Java source code file (Decode.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

decode, empty, numberformatexception, okay, out, raw, result, runtimeexception, string

The Decode.java Java example source code

/*
 * Copyright (c) 1998, 2007, 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 4136371 5017980 6576055
 * @summary Test Short.decode method
 * @author madbot
 * @author Joseph D. Darcy
 */

/**
 * There are six methods in java.lang.Short which transform strings
 * into a short or Short value:
 *
 * public Short(String s)
 * public static Short decode(String nm)
 * public static short parseShort(String s, int radix)
 * public static short parseShort(String s)
 * public static Short valueOf(String s, int radix)
 * public static Short valueOf(String s)
 *
 * However, of these only decode has a nontrivial implementation
 * in that class.
 */
public class Decode {

    private static void check(String ashort, short expected) {
        short sh = (Short.decode(ashort)).shortValue();
        if (sh != expected)
            throw new RuntimeException("Short.decode failed. String:" +
                                                ashort + " Result:" + sh);
    }

    private static void checkFailure(String val, String message) {
        try {
            short n = (Short.decode(val)).shortValue();
            throw new RuntimeException(message);
        } catch (NumberFormatException e) { /* Okay */}
    }

    public static void main(String[] args) throws Exception {
        check(new String(""+Short.MIN_VALUE), Short.MIN_VALUE);
        check(new String(""+Short.MAX_VALUE), Short.MAX_VALUE);

        check("10",   (short)10);
        check("0x10", (short)16);
        check("0X10", (short)16);
        check("010",  (short)8);
        check("#10",  (short)16);

        check("+10",   (short)10);
        check("+0x10", (short)16);
        check("+0X10", (short)16);
        check("+010",  (short)8);
        check("+#10",  (short)16);

        check("-10",   (short)-10);
        check("-0x10", (short)-16);
        check("-0X10", (short)-16);
        check("-010",  (short)-8);
        check("-#10",  (short)-16);

        check(Integer.toString((int)Short.MIN_VALUE), Short.MIN_VALUE);
        check(Integer.toString((int)Short.MAX_VALUE), Short.MAX_VALUE);

        checkFailure("0x-10",   "Short.decode allows negative sign in wrong position.");
        checkFailure("0x+10",   "Short.decode allows positive sign in wrong position.");

        checkFailure("+",       "Raw plus sign allowed.");
        checkFailure("-",       "Raw minus sign allowed.");

        checkFailure(Integer.toString((int)Short.MIN_VALUE - 1), "Out of range");
        checkFailure(Integer.toString((int)Short.MAX_VALUE + 1), "Out of range");

        checkFailure("", "Empty String");
    }
}