How Can I Reliably Identify Integer Strings in Java?

How to Identify Integer Strings in Java

Determining if a string within an array represents an integer can be a critical skill in programming applications. This question focuses on splitting an infix expression into arrays of integers and operators, showcasing the nuances of string parsing.

While the respondent suggests a straightforward approach of iterating through the string for digit validation, a more practical solution involves utilizing Java's own utilities. The Scanner class provides an hasNextInt(int radix) method that robustly verifies integerity based on the specified radix.

For example, the code snippet below demonstrates the usage:

public static boolean isInteger(String s, int radix) {
    Scanner sc = new Scanner(s.trim());
    if (!sc.hasNextInt(radix)) return false;
    sc.nextInt(radix);
    return !sc.hasNext();
}

Alternatively, the question suggests a questionable practice of using Integer.parseInt(s) and parsing exceptions for true falsity. While this method may seem convenient, it's strongly discouraged due to potential vulnerabilities and unpredictability.

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