How to Convert String to Char Stream in Java without Using Library Functions? Last Updated : 12 Feb, 2024 Summarize Comments Improve Suggest changes Share Like Article Like Report In Java, we can convert a string to a char stream with a simple built-in method .toCharArray(). Here, we want to convert the string to a char stream without using built-in library functions. So, we will create an empty char array iterate it with string characters, and store the individual characters from the string to the char array one after the other. In this article, we will learn how to convert String to char stream in Java without using library functions. Example of String to char stream in Java Input: Hello WorldOutput: H e l l o W o r l d Input: She is IntelligentOutput: S h e i s I n t e l l i g e n t Program to Convert String to Char Stream Without Using Library Functions in JavaBelow is the implementation to convert string to char stream using charAt() method in Java. Java // Java program to convert string to charStream // Driver Class public class MyClass { // Main Function public static void main(String[] args) { // storing string String stringData = "Hello World"; // printing original string System.out.println("Stirng Data : "+stringData); // creating a character stream char[] streamChar = new char[stringData.length()]; // iterating streamChar with stringData // to store the characters from stringData to streamChar for (int n = 0; n < stringData.length(); n++) { streamChar[n] = stringData.charAt(n); } // displaying the converted char Stream System.out.print("Converted Character Stream : "); for (char chr : streamChar) { System.out.print(chr + " "); } } } OutputStirng Data : Hello World Converted Character Stream : H e l l o W o r l d Explanation of the Program:In the above program, we have firstly stored a string in a string variable.Then we have created an empty char stream with the size of string.After that we iterated the char stream with string data.By using charAt() we will be getting the individual character from string.Storing each character from the string into the char stream till the string size exceeds.Finally displaying the char stream. 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