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Java StringBufferInputStream Class - GeeksforGeeks

Last Updated : 21 Apr, 2025

The StringBufferInoutStream class in Java allows us to create an input stream from a string, so that we can read bytes from it. It only works with the lower 8 bits of each character, It can not handle the full range of character values. Instead of using this class, the best approach is to use ByteArrayInputStream, which does not have this limitation, it can read the full range of character values.

Note: The StringBufferInputStream has been deprecated by Oracle.

The Declaration of the StringBufferInputStream class is below:

public class StringBufferInputStream extends InputStream

This class consists of one constructor, with the help of which we can create an object of this class.

1. StringBufferInputStream(String str): This constructor is used to create a string input stream to read data from a specified string.

Syntax:

StringBufferInputStream(String str)

Example:

// Demonstrating the working 
// of StringBufferInputStream(String str)
import java.io.*;

public class Geeks{
    public static void main(String[] args) {
        
        // Creating a String to be used with StringBufferInputStream
        String str = "Hello, World!";

        // Creating StringBufferInputStream from the String
        StringBufferInputStream is = new StringBufferInputStream(str);

        // Reading bytes from the StringBufferInputStream
        int data;
        try {
            while ((data = is.read()) != -1) {
                // Print each byte as a character
                System.out.print((char) data);
            }
            is.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

The image below demonstrates the methods of PipedWriter class.

Now, we are going to discuss about each method one by one in detail:

1. read(): This method is used to reads a byte of data from the input stream

Syntax:

public int read()

• Parameter: This method does not take any parameter.
• Return Type: This method returns the read character as an integer otherwise returns -1, when the end of the stream is reached.

2. read(byte[] buffer, int offset, int maxlen): This method is used to read a specific number of characters from a buffer.

Syntax:

public int read(byte[] buffer, int offset, int maxlen)

• Parameter: This method takes three parameters, which are listed below:
  • buffer: It is an array to store characters
  • offset: It is the starting position from where to store character
  • maxlen: It is the maximum number of characters to read.
• Return Type: This method returns the maximum number of character to read otherwise returns -1 when the end of the stream is reached.

3. reset(): This method is used to reset the stream and because of this the reading starts from the beginning.

Syntax:

public void reset()

• Parameter: This method does not take any parameter.
• Return Type: This method does not return anything.

4. skip(long n): This method is used to skip and ignore some characters in the input stream.

Syntax:

public long skip(long n)

• Parameter: This method takes a single paramter n, which is the number of bytes to skip
• Return Type: This method returns the actuall number of bytes skipped.

5. available(): This method tells how many characters are left to read in the input stream

Syntax:

public int available()

• Parameter: This method does not take any parameter
• Return Type: This method returns the number of characters that can be read from the input stream.

Now, in the below example we willl see the working of all the methods.

Example:

// Demonstrating the working of 
// read(), read(byte[] buffer, int offset, int maxlen),
// reset(), skip(long n), available()
import java.io.*;

public class Geeks {
    public static void main(String[] args) throws IOException {
        
        String s1 = "Hello Geeks";
        String s2 = "GeeksForGeeks";

        StringBufferInputStream b1 = new StringBufferInputStream(s1);
        StringBufferInputStream b2 = new StringBufferInputStream(s2);

        // available()
        System.out.println("Use of available() 1: " + b1.available());

        int a;
        System.out.println("Use of read() method:");
        while ((a = b1.read()) != -1) {
            char c = (char) a;
            System.out.println(c);

            // skip()
            b1.skip(1);
        }

        System.out.println("Use of available() 2: " + b2.available());

        byte[] byteBuffer = new byte[15];
        b2.read(byteBuffer, 1, 2);

        int b;
        System.out.print("Remaining characters after partial read: ");
        while ((b = b2.read()) != -1) {
            System.out.print((char) b);
        }

        // reset()
        b1.reset();
        System.out.print("\nAfter reset(): ");
        int i;
        while ((i = b1.read()) != -1) {
            System.out.print((char) i);
        }
    }
}

Use of available() 1: 11
Use of read() method:
H
l
o
G
e
s
Use of available() 2: 13
Remaining characters after partial read: eksForGeeks
After reset(): Hello Geeks

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