Java String Slice slice(String input, int index, int length)

Description

Returns a substring starting at the given index for the given length.

License

Open Source License

Parameter

Parameter	Description
input	The string to be sliced.
index	The zero-based starting index of the slice.
length	The length in characters of the slice.

Return

The resulting substring.

Declaration

public static String slice(String input, int index, int length) 

Method Source Code

//package com.java2s;
/*/*w w w.  j a  v a  2  s  .com*/
 * The MIT License (MIT)
 *
 * Copyright (c) 2012 Lachlan Dowding
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

public class Main {
    /**
     * Returns a substring starting at the given index for the given length.
     *
     * @param input  The string to be sliced.
     * @param index  The zero-based starting index of the slice.
     * @param length The length in characters of the slice.
     * @return The resulting substring.
     */
    public static String slice(String input, int index, int length) {
        if (input == null || input.equals(""))
            return input;

        String output = "";
        int inputLength = input.length(), endIndex = 0;

        // support reverse length
        if (length < 0) {
            // support reverse indexing
            if (index < 0) {
                endIndex = index + inputLength + 1;
            } else {
                if (index >= inputLength)
                    index = inputLength - 1;
                endIndex = index + 1;
            }
            index = endIndex + length;
        } else {
            // support reverse indexing
            if (index < 0)
                index += inputLength;
            endIndex = index + length;
        }

        if (index < inputLength && endIndex > 0) {
            if (index < 0)
                index = 0;
            if (endIndex > inputLength)
                endIndex = inputLength;

            output = input.substring(index, endIndex);
        }

        return output;
    }

    /**
     * Returns the length or number of characters of the string.
     *
     * @param string The string to be measured.
     * @return The length of the given string.
     */
    public static int length(String string) {
        int length = 0;
        if (string != null)
            length = string.length();
        return length;
    }
}

Related

1. slice(int theNum, String[] theStringArray)
2. slice(String contents, int CONTENT_COLUMN_SIZE)
3. slice(String line)
4. slice(String value, int beginOffset, int endOffset, boolean trim)
5. sliceAndMatch(String fstring, String rstring)
6. sliceLength(int start, int stop, long step)