使用Scanner或NumberFormat进行安全转换：

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import java.text.NumberFormat; import java.text.ParseException; import java.util.Scanner; String userInput = "123"; // Incorrect: using parseInt directly int number = Integer.parseInt(userInput); // This may throw NumberFormatException

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// Correct: using Scanner for safe conversion try (Scanner scanner = new Scanner(userInput)) { if (scanner.hasNextInt()) { int numberCorrect = scanner.nextInt(); // Continue with operations using numberCorrect } else { // Handle the case when the conversion fails } }

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// Correct: using NumberFormat for safe conversion try { NumberFormat format = NumberFormat.getInstance(); Number numberObj = format.parse(userInput); int numberCorrect = numberObj.intValue(); // Continue with operations using numberCorrect } catch (ParseException | ClassCastException e) { // Handle the case when the conversion fails e.printStackTrace(); }

处理小数和浮点数：

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String decimalString = "12.34"; // Incorrect: using parseInt for decimal string int number = Integer.parseInt(decimalString); // This will throw NumberFormatException

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// Correct: using Double.parseDouble for decimal string try { double numberCorrect = Double.parseDouble(decimalString); // Continue with operations using numberCorrect } catch (NumberFormatException e) { // Handle the case when the conversion fails e.printStackTrace(); }

国际化和本地化：

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String localizedNumberString = "1.234,56"; // Example for German locale // Incorrect: using parseInt without considering locale int number = Integer.parseInt(localizedNumberString); // This will throw NumberFormatException

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// Correct: using NumberFormat with locale for safe conversion try { NumberFormat format = NumberFormat.getInstance(Locale.GERMANY); Number numberObj = format.parse(localizedNumberString); int numberCorrect = numberObj.intValue(); // Continue with operations using numberCorrect } catch (ParseException | ClassCastException e) { // Handle the case when the conversion fails e.printStackTrace(); }