Java Utililty Methods String Pad Left

String leftAlignedPaddedString(String input, int length)
Utility to return a left-aligned version of a string padded to the number of characters specified.

if (length <= 0) {
 return null;
StringBuilder output = new StringBuilder();
char space = ' ';
if (input != null) {
 if (input.length() < length) {
 output.append(input);
...

byte[] leftPad(byte[] data, int size, byte pad)
Pad a byte array with leading bytes.

if (size <= data.length) {
 return data;
byte[] newData = new byte[size];
for (int i = 0; i < size; i++) {
 newData[i] = pad;
for (int i = 0; i < data.length; i++) {
...

String leftPad(final String input, final int size)
left Pad

int pads = size - input.length();
if (pads <= 0)
 return input;
StringBuilder out = new StringBuilder();
for (int i = pads; i > 0; i--)
 out.append(' ');
return out.append(input).toString();

String leftPad(final String numStr, final int numDigits)
Left pad given number string with zeros.

StringBuffer buff = new StringBuffer(numStr);
int delta = numDigits - numStr.length();
for (int i = 0; i < delta; i++) {
 buff.insert(0, '0');
return buff.toString();

String leftPad(final String str, final int size, String padStr)

Left pad a String with a specified String.

Pad to a size of size .

 StringUtils.leftPad(null, *, *) = null StringUtils.leftPad("", 3, "z") = "zzz" StringUtils.leftPad("bat", 3, "yz") = "bat" StringUtils.leftPad("bat", 5, "yz") = "yzbat" StringUtils.leftPad("bat", 8, "yz") = "yzyzybat" StringUtils.leftPad("bat", 1, "yz") = "bat" StringUtils.leftPad("bat", -1, "yz") = "bat" StringUtils.leftPad("bat", 5, null) = " bat" StringUtils.leftPad("bat", 5, "") = " bat" 

if (str == null) {
 return null;
if (isEmpty(padStr)) {
 padStr = " ";
final int padLen = padStr.length();
final int strLen = str.length();
...

String leftPad(final String value, final int length, final char paddingChar)
left Pad

final StringBuilder sb = new StringBuilder(value);
while (sb.length() < length) {
 sb.insert(0, paddingChar);
return sb.toString();

void leftPad(long value, char padChar, int maxDigits, StringBuilder buf)
Left-pads values where 0 <= n.

int digits = (value == 0) ? 1 : (int) Math.log10(value) + 1;
for (int i = 0; i < maxDigits - digits; i++) {
 buf.append(padChar);
buf.append(value);

String leftPad(Object obj, char pad, int len)
left Pad

if (obj == null)
 return null;
String str = obj.toString();
int padLen = len - str.length();
if (padLen <= 0)
 return str;
StringBuilder b = new StringBuilder();
for (int i = 0; i < padLen; i++)
...

String leftPad(String _str, int _size, char _padChar)
left Pad

if (_str == null) {
 return null;
int pads = _size - _str.length();
if (pads <= 0) {
 return _str; 
return padding(pads, _padChar).concat(_str);
...

String leftPad(String aStr, int aLen)
Right-justify a String in a field, padding left with blank.

return replicate(' ', aLen - aStr.length()) + aStr;