Java Number Minus minus(Number n)

Description

Negate a number

License

Open Source License

Declaration

public static Number minus(Number n) 

Method Source Code

//package com.java2s;
/*// w  w  w.  j a  v a 2 s . co  m
 * This file is part of FFMQ.
 *
 * FFMQ is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * FFMQ 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with FFMQ; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

public class Main {
    /**
     * Negate a number
     */
    public static Number minus(Number n) {
        Number value = normalize(n);
        Class<?> type = value.getClass();

        if (type == Long.class)
            return Long.valueOf(-n.longValue());

        return new Double(-n.doubleValue());
    }

    public static Number normalize(Number value) {
        Class<?> type = value.getClass();
        if (type == Long.class || type == Double.class)
            return value;

        if (isIntegerType(type))
            return Long.valueOf(value.longValue());
        else
            return new Double(value.doubleValue());
    }

    private static boolean isIntegerType(Class<?> type) {
        return type == Byte.class || type == Short.class || type == Integer.class || type == Long.class;
    }
}

Related

1. minus(double[] a)
2. minus(double[] p, double[] q)
3. minus(double[][] x, double[][] y, double[][] r)
4. minus(int flags, int set)
5. minus(Integer a, Integer b)
6. minus(Number n)
7. minus(String bigger, String smaller)
8. minus(String second, String first)
9. minus128(int v)