Java String Pad Zero zeroPad(final String s, final int fieldLength)

Description

Prepend the given string with zeros.

License

Apache License

Parameter

Parameter	Description
s	the given string
fieldLength	desired total field length including the given string

Return

the given string prepended with zeros.

Declaration

public static final String zeroPad(final String s, final int fieldLength) 

Method Source Code

//package com.java2s;
/*/*from w ww  .j a  v  a2s.c  om*/
 * Copyright 2015-16, Yahoo! Inc.
 * Licensed under the terms of the Apache License 2.0. See LICENSE file at the project root for terms.
 */

public class Main {
    /**
     * Prepend the given string with zeros. If the given string is equal or greater than the given
     * field length, it will be returned without modification.
     * @param s the given string
     * @param fieldLength desired total field length including the given string
     * @return the given string prepended with zeros.
     */
    public static final String zeroPad(final String s, final int fieldLength) {
        return characterPad(s, fieldLength, '0', false);
    }

    /**
     * Prepend or postpend the given string with the given character to fill the given field length.
     * If the given string is equal or greater than the given field length, it will be returned
     * without modification.
     * @param s the given string
     * @param fieldLength the desired field length
     * @param padChar the desired pad character
     * @param postpend if true append the pacCharacters to the end of the string.
     * @return prepended or postpended given string with the given character to fill the given field
     * length.
     */
    public static final String characterPad(final String s, final int fieldLength, final char padChar,
            final boolean postpend) {
        final char[] chArr = s.toCharArray();
        final int sLen = chArr.length;
        if (sLen < fieldLength) {
            final char[] out = new char[fieldLength];
            final int blanks = fieldLength - sLen;

            if (postpend) {
                for (int i = 0; i < sLen; i++) {
                    out[i] = chArr[i];
                }
                for (int i = sLen; i < fieldLength; i++) {
                    out[i] = padChar;
                }
            } else { //prepend
                for (int i = 0; i < blanks; i++) {
                    out[i] = padChar;
                }
                for (int i = blanks; i < fieldLength; i++) {
                    out[i] = chArr[i - blanks];
                }
            }

            return String.valueOf(out);
        }
        return s;
    }
}

Related

1. zeroPad(String encodeString, int padding)
2. zeroPad(String encodeString, int padding)
3. zeropad(String number, int size)
4. zeroPad(String s, int fieldLength)