Question

I want to split string without using split . can anybody solve my problem I am tried but
I cannot find the exact logic.

Answer 1

I’m going to assume that this is homework, so I will only give snippets as hints:

Finding indices of all occurrences of a given substring

Here’s an example of using indexOf with the fromIndex parameter to find all occurrences of a substring within a larger string:

String text = "012ab567ab0123ab";

// finding all occurrences forward: Method #1
for (int i = text.indexOf("ab"); i != -1; i = text.indexOf("ab", i+1)) {
    System.out.println(i);
} // prints "3", "8", "14"

// finding all occurrences forward: Method #2
for (int i = -1; (i = text.indexOf("ab", i+1)) != -1; ) {
    System.out.println(i);
} // prints "3", "8", "14"

String API links

• int indexOf(String, int fromIndex)
  • Returns the index within this string of the first occurrence of the specified substring, starting at the specified index. If no such occurrence exists, -1 is returned.

Related questions

• Searching for one string in another string

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Extracting substrings at given indices out of a string

This snippet extracts substring at given indices out of a string and puts them into a List<String>:

String text = "0123456789abcdefghij";

List<String> parts = new ArrayList<String>();
parts.add(text.substring(0, 5));
parts.add(text.substring(3, 7));
parts.add(text.substring(9, 13));
parts.add(text.substring(18, 20));

System.out.println(parts); // prints "[01234, 3456, 9abc, ij]"

String[] partsArray = parts.toArray(new String[0]);

Some key ideas:

• Effective Java 2nd Edition, Item 25: Prefer lists to arrays
  • Works especially nicely if you don’t know how many parts there’ll be in advance

String API links

• String substring(int beginIndex, int endIndex)
  • Returns a new string that is a substring of this string. The substring begins at the specified beginIndex and extends to the character at index endIndex - 1.

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• Fill array with List data