How to Replace StringBufferInputStream with StringReader in Java?

How do I replace StringBufferInputStream with StringReader in Java?

String str = "Hello, World!";
StringReader stringReader = new StringReader(str);

In Java, StringBufferInputStream has been deprecated since JDK 1.1. The preferred approach for reading strings as streams is to use StringReader. This change encourages developers to use more efficient and safer APIs. Below are the steps for replacing StringBufferInputStream with StringReader along with code examples.

import java.io.StringReader;

public class Example {
    public static void main(String[] args) {
        String str = "Hello, World!";
        StringReader reader = new StringReader(str);
        int data;
        while ((data = reader.read()) != -1) {  
            System.out.print((char) data);  
        }
        reader.close();  
    }
}

Causes

• StringBufferInputStream is considered outdated as it relies on StringBuffer, which is not thread-safe for reading streams.
• StringReader provides a more flexible and simpler approach for reading character-based streams from strings.

Solutions

• Identify instances of StringBufferInputStream in your codebase.
• Replace instances with StringReader, which accepts a String as input for stream creation.
• Adjust any associated stream handling code to work with the new StringReader instance.

Mistake: Not closing the StringReader after use.

Solution: Always close the StringReader to free system resources.

Mistake: Using StringReader with non-character-based input.

Solution: Ensure the input for StringReader is a valid String, as it does not handle byte streams.