Here you can find the source of zeroPadLeft(String s, final int len)
Parameter | Description |
---|---|
s | a parameter |
len | a parameter |
public static String zeroPadLeft(String s, final int len)
//package com.java2s; public class Main { public static final String STR_EMP = ""; private static final char[][] ZERO_POOL = new char[65][]; /**//from w w w . ja v a2 s . c o m * * @param s * @param len * @return */ public static String zeroPadLeft(String s, final int len) { s = s.trim(); if (s.length() > len) { return s; } int fll = len - s.length(); final char[] charArray = new char[len]; int index = 0, res = fll / 65; while (res > 0) { System.arraycopy(ZERO_POOL[64], 0, charArray, index, 64); index += 65; res--; } res = fll; fll = fll % 65; if (fll > 0) { System.arraycopy(ZERO_POOL[fll], 0, charArray, index, ZERO_POOL[fll].length); } s.getChars(0, s.length(), charArray, res); return new String(charArray); } /** * * @param s * @param c * @return */ public static String trim(final String s, final String c) { final int length = s.length(); if (c == null) { return s; } final int cLength = c.length(); if (c.length() == 0) { return s; } int start = 0; int end = length; boolean found = false; int i; for (i = 0; !found && i < length; i++) { char ch = s.charAt(i); found = true; for (int j = 0; found && j < cLength; j++) { if (c.charAt(j) == ch) { found = false; } } } if (!found) { return STR_EMP; } start = i - 1; found = false; for (i = length - 1; !found && i >= 0; i--) { char ch = s.charAt(i); found = true; for (int j = 0; found && j < cLength; j++) { if (c.charAt(j) == ch) { found = false; } } } end = i + 2; return s.substring(start, end); } /** * * @param s * @param c * @return */ public static String trim(final String s, final char c) { final int length = s.length(); int cLength = 1; int start = 0; int end = length; boolean found = false; int i; for (i = 0; !found && i < length; i++) { char ch = s.charAt(i); found = true; for (int j = 0; found && j < cLength; j++) { if (c == ch) { found = false; } } } if (!found) { return STR_EMP; } start = i - 1; found = false; for (i = length - 1; !found && i >= 0; i--) { char ch = s.charAt(i); found = true; for (int j = 0; found && j < cLength; j++) { if (c == ch) { found = false; } } } end = i + 2; return s.substring(start, end); } }