Using Integer Wrapper Class for String-to-Int Conversion in Java

Java boasts a comprehensive standard library that presents numerous techniques for turning a String into an int. Notably, the parseInt method from the Integer wrapper class is renowned for its efficiency and widespread use. Fundamentally, this function treats the input string as a signed decimal number, making it adept at deciphering both positive and negative number strings. Nevertheless, not all strings transition smoothly to integers. Strings that deviate from the standard format or include unrecognizable characters result in the parseInt method launching a NumberFormatException. This exception indicates a discrepancy during the conversion. Given this exception's implications, wrapping the transformation in a try-catch block is vital when handling strings from uncertain sources like user entries or external datasets. This approach lets developers manage unforeseen issues and prevents the program from unexpected crashes. In this Java String to Int Example, we created a String and converted it to Int. Click Execute to run the Java String to Int Example online and see the result.
Using Integer Wrapper Class for String-to-Int Conversion in Java Execute
public class StringToIntDemo {
    public static void main(String[] args) {
        String numberString = "12345";

        try {
            int number = Integer.parseInt(numberString);
            System.out.println("Converted integer value: " + number);
        } catch (NumberFormatException e) {
            System.out.println("Error: The given string '" + numberString + "' is not a valid integer representation.");
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