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Java Program to Convert String to InputStream

  • Last Updated : 12 Jun, 2021

Given a string, the task is to convert the string to InputStream which is shown in the below illustrations.


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Input  : String : "Geeks for Geeks"
Output : Input Stream : Geeks for Geeks 
Input  : String : "A computer science portal"
Output : Input stream :  A computer science portal 

In order to reach the goal, we need to use ByteArrayInputStream. So let us discuss how it’s done?

We can convert a String to an InputStream object by using the ByteArrayInputStream class. The ByteArrayInputStream is a subclass present in InputStream class. In ByteArrayInputStream there is an internal buffer present that contains bytes that reads from the stream.


  1. Get the bytes of the String.
  2. Create a new ByteArrayInputStream using the bytes of the String
  3. Assign the ByteArrayInputStream object to an InputStream variable.
  4. Buffer contains bytes that read from the stream.
  5. Print the InputStream.



// Java Program to Convert String to InputStream
// Using ByteArrayInputStream
// Importing required libraries
import java.nio.charset.Charset;
// Main class
public class GFG {
    // main driver method
    public static void main(String[] args) throws IOException {
        // Custom inout string as an input
        String string = "Geeks for Geeks";
        // Printing the above string
        System.out.print("String : " + string);
        // Now, using ByteArrayInputStream to
        // get the bytes of the string, and
        // converting them to InputStream
        InputStream stream = new ByteArrayInputStream(string.getBytes
        // Creating an object of BufferedReader class to
        // take input
        BufferedReader br = new BufferedReader(new InputStreamReader(stream));
        // Printing the input stream
        // using rreadLine() method
        String str = br.readLine();
        System.out.print("\nInput stream : ");
        // If string is not NULL
        while (str != null) {
            // Keep taking input
            str = br.readLine();


String : Geeks for Geeks
Input stream : Geeks for Geeks


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