Java Unsigned Number Create unsignedIntToSignedByte(final int i)

Description

Converts an unsigned integer to a signed byte (e.g., 255 becomes -1).

License

Apache License

Parameter

Parameter	Description
i	integer to convert to byte

Exception

Parameter	Description
IllegalArgumentException	if the provided integer is not inside the range [0,255].

Return

byte representation of the provided int

Declaration

public static byte unsignedIntToSignedByte(final int i) 

Method Source Code

//package com.java2s;
/*//www .  j  ava2s.c  o  m
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */

public class Main {
    /**
     * Converts an unsigned integer to a signed byte (e.g., 255 becomes -1).
     *
     * @param i integer to convert to byte
     * @return byte representation of the provided int
     * @throws IllegalArgumentException if the provided integer is not inside the range [0,255].
     * @since 1.5
     */
    public static byte unsignedIntToSignedByte(final int i) {
        if (i > 255 || i < 0) {
            throw new IllegalArgumentException(
                    "Can only convert non-negative integers between [0,255] to byte: [" + i + "]");
        }
        if (i < 128) {
            return (byte) i;
        }
        return (byte) (i - 256);
    }
}

Related

1. unsignedIntToLong(byte[] b)
2. unsignedIntToLong(byte[] bytes)
3. unsignedIntToLong(byte[] source)
4. unsignedIntToLong(int value)
5. unsignedIntToLong(Integer i)
6. unsignedIntToString(int x)
7. unsignedIntToString(int x, int radix)
8. unsignedIntValue(byte[] data, int offset)
9. unsignedLeb128Size(int value)