Java String abbreviate and show ...

public class Main {
    public static void main(String[] argv) throws Exception {
        String str = "demo2s.com";
        int maxWidth = 6;
        System.out.println(abbreviate(str, maxWidth));
    }//w  ww . ja  v a2  s .co m
    public static final String EMPTY = "";


    public static String abbreviate(String str, int maxWidth) {
        return abbreviate(str, 0, maxWidth);
    }

    /**
     * <p>Abbreviates a String using ellipses. This will turn
     * "Now is the time for all good men" into "...is the time for..."</p>
     *
     * <p>Works like <code>abbreviate(String, int)</code>, but allows you to specify
     * a "left edge" offset.  Note that this left edge is not necessarily going to
     * be the leftmost character in the result, or the first character following the
     * ellipses, but it will appear somewhere in the result.
     *
     * <p>In no case will it return a String of length greater than
     * <code>maxWidth</code>.</p>
     *
     * <pre>
     * abbreviate(null, *, *)                = null
     * abbreviate("", 0, 4)                  = ""
     * abbreviate("abcdefghijklmno", -1, 10) = "abcdefg..."
     * abbreviate("abcdefghijklmno", 0, 10)  = "abcdefg..."
     * abbreviate("abcdefghijklmno", 1, 10)  = "abcdefg..."
     * abbreviate("abcdefghijklmno", 4, 10)  = "abcdefg..."
     * abbreviate("abcdefghijklmno", 5, 10)  = "...fghi..."
     * abbreviate("abcdefghijklmno", 6, 10)  = "...ghij..."
     * abbreviate("abcdefghijklmno", 8, 10)  = "...ijklmno"
     * abbreviate("abcdefghijklmno", 10, 10) = "...ijklmno"
     * abbreviate("abcdefghijklmno", 12, 10) = "...ijklmno"
     * abbreviate("abcdefghij", 0, 3)        = IllegalArgumentException
     * abbreviate("abcdefghij", 5, 6)        = IllegalArgumentException
     * </pre>
     *
     * @param str  the String to check, may be null
     * @param offset  left edge of source String
     * @param maxWidth  maximum length of result String, must be at least 4
     * @return abbreviated String, <code>null</code> if null String input
     * @throws IllegalArgumentException if the width is too small
     * @since 2.0
     */
    public static String abbreviate(String str, int offset, int maxWidth) {
        if (str == null) {
            return null;
        }
        if (maxWidth < 4) {
            throw new IllegalArgumentException("Minimum abbreviation width is 4");
        }
        if (str.length() <= maxWidth) {
            return str;
        }
        if (offset > str.length()) {
            offset = str.length();
        }
        if ((str.length() - offset) < (maxWidth - 3)) {
            offset = str.length() - (maxWidth - 3);
        }
        if (offset <= 4) {
            return str.substring(0, maxWidth - 3) + "...";
        }
        if (maxWidth < 7) {
            throw new IllegalArgumentException("Minimum abbreviation width with offset is 7");
        }
        if ((offset + (maxWidth - 3)) < str.length()) {
            return "..." + abbreviate(str.substring(offset), maxWidth - 3);
        }
        return "..." + str.substring(str.length() - (maxWidth - 3));
    }
}

/*
 * Licensed 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.
 */

//package com.demo2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        String s = "www.demo2s.com";
        int len = 2;
        System.out.println(abbr(s, len));
    }/*from  ww w  . ja v a2s  .  co m*/

    public static String abbr(String s, int len) {
        int length = length(s);
        if (length <= len) {
            return s;
        }
        return s.substring(0, len - 3) + "...";
    }

    public static int length(String s) {
        return s != null ? s.length() : 0;
    }
}

//package com.demo2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        String str = "www.demo2s.com";
        int maxWidth = 6;
        System.out.println(abbreviate(str, maxWidth));
    }/*from  ww w  .  j  ava 2s  . co  m*/

    public static String abbreviate(String str, int offset, int maxWidth) {
        if (str == null) {
            return null;
        }
        if (maxWidth < 4) {
            throw new IllegalArgumentException("Minimum abbreviation width is 4");
        }
        if (str.length() <= maxWidth) {
            return str;
        }
        if (offset > str.length()) {
            offset = str.length();
        }
        if ((str.length() - offset) < (maxWidth - 3)) {
            offset = str.length() - (maxWidth - 3);
        }
        if (offset <= 4) {
            return str.substring(0, maxWidth - 3) + "...";
        }
        if (maxWidth < 7) {
            throw new IllegalArgumentException("Minimum abbreviation width with offset is 7");
        }
        if ((offset + (maxWidth - 3)) < str.length()) {
            return "..." + abbreviate(str.substring(offset), maxWidth - 3);
        }
        return "..." + str.substring(str.length() - (maxWidth - 3));
    }

    public static String abbreviate(String str, int maxWidth) {
        return abbreviate(str, 0, maxWidth);
    }
}