How to Fix the BufferedReader Infinite Loop in Java Code

Learn how to resolve the infinite loop error in your Java code when using BufferedReader for input. Get practical tips and an improved code solution.
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This video is based on the question https://stackoverflow.com/q/66622861/ asked by the user 'Marvin Raymund Popioco' ( https://stackoverflow.com/u/15392665/ ) and on the answer https://stackoverflow.com/a/66632286/ provided by the user 'the Hutt' ( https://stackoverflow.com/u/15273968/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving the BufferedReader Infinite Loop in Java

If you are working with Java and using BufferedReader to read input from the console, you might have encountered an infinite loop scenario. This can be quite frustrating, especially when you are unsure how to exit the loop appropriately. In this guide, we will discuss the problem and provide you with a clear solution so you can continue coding without any hurdles.

Understanding the Problem

The primary issue arises from the way the BufferedReader interacts with input streams. In a typical scenario, you may want to continuously receive input from the user until a certain condition is met—such as receiving a specific input signal to terminate the program. However, with incorrect loop conditions, you may accidentally create an infinite loop that never terminates, as shown in the following example:

[[See Video to Reveal this Text or Code Snippet]]

What Went Wrong?

In this code snippet, notice that the semicolon (;) following the while loop creates an empty body for the loop. This means the loop will keep reading input indefinitely until it hits an end-of-stream condition, which is not the intended behavior and results in an infinite loop without any output or prompt to the user.

Providing a Solution

To correct this problem, we need to refactor the code so that the loop behaves as intended. Below is a working example of how you can implement a loop to read two integers from the user, calculate their sum, and display the result without falling into an infinite loop.

Improved Code Example

[[See Video to Reveal this Text or Code Snippet]]

How It Works

Reading Input: The BufferedReader reads the input from the console.

Loop Condition: The do-while structure allows you to execute the body of the loop at least once and continue looping until specified conditions are met.

Check for Input: If the user inputs anything (not null and not blank), the program splits the input into two strings, converts them to integers, and calculates the sum.

Exiting the Loop: If the user simply presses Enter without providing any values, the loop will exit gracefully.

Conclusion

By modifying your loop structure and ensuring you properly handle input conditions, you can effectively avoid infinite loops when working with BufferedReader in Java. This solution not only makes your code more robust but also enhances user experience by providing clear exit options.

Happy coding, and may your loops always terminate!

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