void criticalMethod(String userName) { // perform security checks if (!isAlphaNumeric(userName)) { throw new SecurityException(); } // do some secondary tasks initializeDatabase(); // critical task connection.executeUpdate("UPDATE Customers SET Status = 'Active' " + " WHERE UserName = '" +...
If it is non-alphanumeric, we replace all its occurrences with empty characters using the String.replace() method.Code:/*Java program to remove non-alphanumeric characters withMethod 2: Using String.replace()*/public class Main {// Function to remove the non-alphanumeric characters and pr...
在调用isAlphaNumeric()方法进行安全性检查期间，userName 的值仍然有可能被criticalMethod()方法的调用者...
How to check if String is empty in Java? Golang Program to Check if a String is Numeric C++ Program to Check if a String is Numeric Swift Program to Check if a String is Numeric Haskell Program to Check if a String is Numeric Golang Program to Check if the String is Alphanumeric Jav...
public static boolean isAlphanumeric(String str);只由字母和数字组成 public static boolean isAlphanumericSpace(String str);只由字母数字和空格组成 public static boolean isNumeric(String str);只由数字组成 public static boolean isNumericSpace(String str);只由数字和空格组成 ...
1. Java regex non-alphanumeric Below is a Java regex to check for non-alphanumeric characters. StringNonAlphanumeric.java packagecom.mkyong.regex.string;publicclassStringNonAlphanumeric{publicstaticvoidmain(String[] args){Stringstr="!@#$%";if(str.matches("^[^a-zA-Z0-9]+$")) { ...
A string is a data type found in computer programming that consists of alphanumeric characters (letters and numbers). A string can be described as a sequence of characters, words, or other meaningful symbols. The characters in a string are stored together as one unit and can be manipulated ...
2. Mask Only Alphanumeric Characters in a String If we want tomask a formatted string, we can tweak the regex accordingly. For example, the following function will only convert the alphanumeric characters in a formatted string except for the last 4 characters. So if the string is a formatte...
要在Java中将InputStream转换为String,可以使用以下方法: 使用Scanner类: 代码语言:java 复制 importjava.io.InputStream;importjava.util.Scanner;publicclassInputStreamToString{publicstaticvoidmain(String[]args){InputStreaminputStream=System.in;// 这里可以替换为您的InputStream实例Scannerscanner=newScanner(input...
import java.util.Date; import java.util.List; import java.util.Random; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; public class StringUtil { private static Random random = new Random((new Date()).getTime()); /** * generates an alphanumeric string based on specified len...