Spliting a String without using any built in functions in Java

In this post, we are going to see how to split a string without using any built in functions.

package com.ranga;

import java.util.ArrayList;
import java.util.List;

/**
 * Write a Java program to split a string with out using any bulit methods like
 * split(), StringTokenizer class methods.
 * 
 * @author Ranga Reddy
 * @version 1.0
 */
public class SplitString {
    public static void main(String[] args) {
        String str = "Welcome to JavabyRangaReddy blog";
        String delimiter = " "; // here delimiter is space
        List<String> list = new ArrayList<String>(); // list is used to store the words
        int i, start = 0, end = 0;
        for (i = str.indexOf(delimiter); i != -1; i = str.indexOf(delimiter, i + 1)) {
            end = i;
            list.add(str.substring(start, end)); // by using substring we can get the one word
            start = i;
        }
        list.add(str.substring(end)); // this is used to add the last word
        System.out.println(list); // print the list
        
        // Converting list to array of strings
        String words[] = (String[]) list.toArray(new String[list.size()]);
        for (String word : words) {
            System.out.println(word.trim());
        }
    }
}

Output:

[Welcome,  to,  JavabyRangaReddy,  blog]
Welcome
to
JavabyRangaReddy
blog