String
internalJoin(String sep, Collection pieces) internal Join
StringBuilder sb = new StringBuilder();
boolean skipSep = true;
Iterator<Object> iter = pieces.iterator();
while (iter.hasNext()) {
if (skipSep) {
skipSep = false;
} else {
sb.append(sep);
...
boolean
isDisjoint(Collection a, Collection b) Returns true if
Collections are disjoint each other.
if (a == null || b == null)
return true;
Collection<?> tester = (a.size() < b.size()) ? a : b;
Collection<?> testant = (a.size() < b.size()) ? b : a;
for (Object o : tester) {
if (testant.contains(o))
return false;
return true;
String
join(AbstractCollection s, String delimiter) Join a Collection of Strings using a delimiter
if (s == null || s.isEmpty()) {
return "";
Iterator<String> iter = s.iterator();
StringBuilder builder = new StringBuilder(iter.next());
while (iter.hasNext()) {
builder.append(delimiter).append(iter.next());
return builder.toString();
StringBuilder
join(CharSequence separator, Collection col) join
final StringBuilder result = new StringBuilder();
if (col != null) {
for (Iterator<?> it = col.iterator(); it.hasNext();) {
result.append(it.next());
if (it.hasNext()) {
result.append(separator);
return result;
String
join(Collection c, String d) join
String result = "";
boolean isFirst = true;
for (Object o : c) {
result += (isFirst ? "" : d) + o.toString();
isFirst = false;
return result;
String
join(Collection c, String delim) join
if (c == null || c.isEmpty())
return "";
else if (c.size() == 1)
return String.valueOf(c.iterator().next());
StringBuffer result = new StringBuffer();
for (Iterator i = c.iterator(); i.hasNext();)
result.append(delim).append(i.next());
return result.substring(delim.length());
...