Java Utililty Methods String Sub String

List of utility methods to do String Sub String

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Description

The list of methods to do String Sub String are organized into topic(s).

Method

StringsubStr(String str, int len)
sub Str 
if (isEmpty(str)) {
    return "";
if (str.length() >= len) {
    return str.substring(0, len) + "..";
} else {
    return str;
Stringsubstr(String str, int length)
safe substring, without exception 
if (str == null) {
    return str;
if (length < str.length()) {
    return str.substring(0, length);
return str;
StringsubStr(String str, int limit)
sub Str 
String result = str.substring(0, 17);
int subLen = 17;
for (int i = 0; i < limit; i++) {
    if (limit < getEncodingByteLen(
            str.substring(0, (subLen + i) > str.length() ? str.length() : (subLen)))) {
        result = str.substring(0, subLen + i - 1);
        break;
    if ((subLen + i) > str.length()) {
        result = str.substring(0, str.length() - 1);
        break;
return result;
StringsubStr(String str, int maxLen)
sub Str 
if (str == null) {
    return null;
if (maxLen < 1) {
    return str;
if (str.length() > maxLen) {
    return str.substring(0, maxLen) + "...";
...
Stringsubstr(String str, int startIndex, int length)
substr 
return substring(str, startIndex, startIndex + length);
Stringsubstr(String substr1, String substr2)
substr 
String substr = "";
int size = Math.min(substr1.length(), substr2.length());
for (int i = 0; i < size; i++) {
    if (substr1.charAt(i) == substr2.charAt(i))
        substr += substr1.charAt(i);
    else
        break;
return substr;
Stringsubstr(String what, int begin, int end)
substr 
if (begin > end) {
    return "";
return what.substring(Math.max(0, begin), Math.min(end, what.length() - 1));
Objectsubstr(StringBuffer buf)
substr 
return (buf == null || buf.length() <= 1 ? "" : buf.substring(0, buf.length() - 1));
double[]substract(double[] a, double[] b)
Subtract the second array from the first one and returns the result. 
double[] out = new double[a.length];
for (int i = 0; i < a.length; i++) {
    out[i] = a[i] - b[i];
return out;
double[]substract(double[] a, double[] b)
substract 
if (a.length != b.length) {
    throw new IllegalArgumentException("Arrays must be equal length");
double[] c = new double[a.length];
for (int i = 0; i < a.length; i++) {
    c[i] = a[i] - b[i];
return c;
...