Java Utililty Methods String Split by Line

ArrayList<String> items = new ArrayList<String>();
int start, end;
int sep_size = separator.length();
start = 0;
end = line.indexOf(separator);
while (end != -1) 
    items.add(line.substring(start, end));
...

LinkedList<String> list = new LinkedList<String>();
if (line != null) {
    int start = 0;
    int end = 0;
    int separatorLen = separator.length();
    while ((end = line.indexOf(separator, start)) >= 0) {
        list.add(line.substring(start, end));
        start = end + separatorLen;
...

assertNotNull("line", line);
assertNotNull("separator", separator);
if (line.length() == 0)
    return new String[0];
int separatorLength = separator.length();
List list = new ArrayList();
int previousIndex = 0;
for (int index = line.indexOf(separator); index != -1; index = line.indexOf(separator, previousIndex)) {
...

if (separator == null || separator.equals(" ")) {
    return line.split("\\s+");
} else {
    String[] strs = line.split(separator);
    List<String> r = new ArrayList<>();
    for (String s : strs) {
        if (!s.isEmpty())
            r.add(s);
...

if (line == null || seperator == null || seperator.length() == 0)
    return null;
ArrayList<String> list = new ArrayList<String>();
int pos1 = 0;
int pos2;
for (;;) {
    pos2 = line.indexOf(seperator, pos1);
    if (pos2 < 0) {
...

List<String> strs = null;
if (line == null || sptr == null || line.isEmpty())
    return strs;
strs = new ArrayList<String>();
int pos = line.indexOf(sptr);
if (sptr.isEmpty() || pos == -1) {
    strs.add(line);
    return strs;
...

List<String> result = null;
if (backslashesAreLiteral) {
    result = splitArgumentsBackslashesAreLiteral(commandLine);
} else {
    result = splitArgumentsBackslashesAreNotLiteral(commandLine);
return result;

List<String> result = null;
if (commandLine != null) {
    result = new ArrayList<String>();
    char[] c = commandLine.toCharArray();
    boolean readingQuotes = false;
    StringBuilder buffer = new StringBuilder();
    for (int i = 0; i < c.length; i++) {
        char cc = c[i];
...

if (line == null) {
    return (new String[0]);
int start = 0;
int state = 0;
List L = new LinkedList();
for (int i = 0; i < line.length(); i++) {
    char c = line.charAt(i);
...

String newLine = line;
Vector temp = new Vector();
while (true) {
    int separatorIndex = newLine.indexOf(sep);
    if (separatorIndex == -1) {
        String lastNum = newLine.substring(separatorIndex + 1);
        temp.addElement(lastNum.trim());
        break;
...