NumberFormatException: For Input String: "" - 解决空字符串转数字错误

The error message "NumberFormatException: For input string: "" indicates that there is an attempt to convert an empty string to a numeric value.\n\nTo fix this issue, you need to check if the string is empty before performing any numeric operations. Here's an example of how you can write a non-empty check in Java:\n\njava\nString input = ""; // The input string\n\nif (!input.isEmpty()) {\n // Perform numeric operations here\n int number = Integer.parseInt(input);\n // ... rest of the code\n} else {\n // Handle the case when the string is empty\n System.out.println("Input string is empty!");\n}\n\n\nIn this example, the isEmpty() method is used to check if the string is empty. If the string is not empty, you can proceed with the numeric operations. Otherwise, you can handle the empty case appropriately.