Java Integer Format format(int c)

Description

Format character for debugging output, which it is prefixed with "0x", padded left with '0' and either 4 or 6 hex characters in width according to whether it is in the BMP or not.

License

Apache License

Parameter

Parameter	Description
c	character code

Return

formatted character string

Declaration

public static String format(int c)

Method Source Code

//package com.java2s;
/*// ww  w  .  j  ava 2 s . 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 {
    /**
     * Format character for debugging output, which it is prefixed with "0x", padded left with '0'
     * and either 4 or 6 hex characters in width according to whether it is in the BMP or not.
     * @param c character code
     * @return formatted character string
     */
    public static String format(int c) {
        if (c < 1114112) {
            return "0x"
                    + padLeft(Integer.toString(c, 16), (c < 65536) ? 4 : 6,
                            '0');
        } else {
            return "!NOT A CHARACTER!";
        }
    }

    /**
     * Pad a string S on left out to width W using padding character PAD.
     * @param s string to pad
     * @param width width of field to add padding
     * @param pad character to use for padding
     * @return padded string
     */
    public static String padLeft(String s, int width, char pad) {
        StringBuffer sb = new StringBuffer();
        for (int i = s.length(); i < width; i++) {
            sb.append(pad);
        }
        sb.append(s);
        return sb.toString();
    }
}