Java Utililty Methods String Multiply

if (factor < 0)
    throw new IllegalArgumentException();
final StringBuilder sb = new StringBuilder();
for (int i = 0; i < factor; i++)
    sb.append(str);
return sb.toString();

final int factorInt = factor.intValue();
if (factor == 0)
    return "";
if (factor == 1)
    return s;
final StringBuilder sb = new StringBuilder(s.length() * factorInt);
for (int i = 0; i < factorInt; ++i) {
    sb.append(s);
...

if (times < 0) {
    throw new IllegalArgumentException();
if (times == 0) {
    return "";
final StringBuilder builder = new StringBuilder(string.length() * times);
for (int i = 0; i < times; i++) {
...

String s = "";
for (int i = 0; i < times; i++) {
    s += original;
return s;

StringBuffer buf = new StringBuffer(self.length() * reps);
for (int i = 0; i < reps; i++) {
    buf.append(self);
return buf.toString();

String result = "0";
String str1 = str11.replace(".", "");
String str2 = str22.replace(".", "");
if (str1.length() > str2.length()) {
    str2 = compare1(str1, str2);
} else if (str1.length() < str2.length()) {
    str1 = compare1(str2, str1);
char[] ch1 = new char[str1.length()];
reverse(str1, ch1);
char[] ch2 = new char[str2.length()];
reverse(str2, ch2);
String[] res = new String[ch1.length * ch1.length];
int r = 0;
for (int i = 0; i < ch1.length; i++) {
    for (int j = 0; j < ch2.length; j++) {
        res[r] = String.valueOf(morePlus(ch1[i] - '0', ch2[j] - '0'));
        for (int k = 0; k <= i + j; k++) {
            if (k > 0) {
                res[r] = res[r] + "0";
        if (r < res.length) {
            r++;
for (String s : res) {
    result = sum(result, s);
int index0 = -1;
for (int i = 0; i < result.length(); i++) {
    if (result.charAt(0) == '0')
        if (result.charAt(i) == '0' && result.charAt(i + 1) != '0') {
            index0 = i;
if (index0 != -1) {
    result = result.substring(index0 + 1);
int index = 0;
if (str11.contains(".") || str22.contains(".")) {
    int index1 = str11.indexOf(".");
    int len1 = str11.length() - 1 - index1;
    int index2 = str22.indexOf(".");
    int len2 = str22.length() - 1 - index2;
    index = result.length() - (len1 + len2);
    StringBuilder ss = new StringBuilder(result);
    ss.insert(index, ".");
    result = ss.toString();
return result;

final StringBuilder ret = new StringBuilder();
for (int i = 0; i < count; i++) {
    ret.append(s);
return ret.toString();

String outStr = "";
for (int i = 0; i < count; i++) {
    outStr += sourceStr;
return outStr;

return Integer.toString(Integer.parseInt(strMultiplicand) * multiplier);