Java Zero Format zeroPrepend(long num, int digits)

Description

Return the string prepended with 0s.

License

Open Source License

Declaration

private static String zeroPrepend(long num, int digits) 

Method Source Code

//package com.java2s;

public class Main {
    private static final String BLOCK_OF_ZEROS = "000000";

    /**//from  ww w  .  j a va  2s.  com
     * Return the string prepended with 0s. Tested as 10x faster than String.format("%06d", ...); Exposed for testing.
     */
    private static String zeroPrepend(long num, int digits) {
        final String hash = Long.toString(num);
        if (hash.length() >= digits) {
            return hash;
        } else {
            final int zeroCount = digits - hash.length();
            final StringBuilder buffer = new StringBuilder(digits).append(BLOCK_OF_ZEROS, 0, zeroCount)
                    .append(hash);

            return buffer.toString();
        }
    }
}

Related

1. zeroOrderBessel(float num)
2. zeroOrMore(String... patterns)
3. zeroOut(byte[] array)
4. ZeroPoleFilter(float In[], int In_idx, float ZeroCoef[], float PoleCoef[], int PoleCoef_idx, int lengthInOut, int orderCoef, float Out[], int Out_idx)
5. zeroPrefix(String str, int width)
6. ZeroRemover(String[] a)
7. zeros(int n)
8. zeros(int size)
9. zerosInt(int len)