Java Number Max Value maxValueUnsigned(int bits)

Description

Get the maximum value representable in a bits bit unsigned integer.

License

Open Source License

Declaration

public static long maxValueUnsigned(int bits) 

Method Source Code

//package com.java2s;
/*/* w  w w . j  a  v  a2  s.c om*/
 * Copyright (c) 2011, 2013, 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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.
 */

public class Main {
    /**
     * Get the maximum value representable in a {@code bits} bit unsigned integer.
     */
    public static long maxValueUnsigned(int bits) {
        return getNbitNumberLong(bits);
    }

    /**
     *
     * @param n Number of bits that should be set to 1. Must be between 0 and 64 (inclusive).
     * @return A number with n bits set to 1.
     */
    public static long getNbitNumberLong(int n) {
        assert n >= 0 && n <= 64;
        if (n < 64) {
            return (1L << n) - 1;
        } else {
            return 0xFFFFFFFFFFFFFFFFL;
        }
    }
}

Related

1. maxInt(float a, float b)
2. maxLimit(float value, float max)
3. maxVal(int numbits)
4. maxValue(byte length)
5. maxValue(int bits)