publicclassStringValidator{publicstaticbooleanisAlphaNumeric(StringinputString){// 判断字符串是否为空if(inputString.isEmpty()){returnfalse;}// 遍历字符串的每一个字符char[]charArray=inputString.toCharArray();for(charc:charArray){// 判断字符是否为字母或数字if(Character.isLetterOrDigit(c)){// 字符...
publicstaticbooleancontainsAlphaNumeric(Stringstr){char[]charArray=str.toCharArray();booleanhasAlpha=false;booleanhasNumeric=false;for(charc:charArray){if(Character.isLetter(c)){hasAlpha=true;}if(Character.isDigit(c)){hasNumeric=true;}}returnhasAlpha&&hasNumeric;}// 测试方法publicstaticvoidmain(Str...
isAlphanumericSpace(String) isAlphaSpace(String) isAsciiPrintable(String) isBlank(String) isEmpty(String) isNotBlank(String) isNotEmpty(String) isNumeric(String) isNumericSpace(String) isWhitespace(String) join(Object[]) join(Object[], char) join(Object[], String) join(Iterator, char) join(Iter...
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...
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 = '" ...
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 StringUtils.isAlpha("a2bdefg"); 返回结果:false ...
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...
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 program that checks if a string is a pangram or not is given as follows: Open Compiler public class Example { public static void main(String[] args) { String str = "The quick brown fox jumps over the lazy dog"; boolean[] alphaList = new boolean[26]; int index = 0; int flag...
9 printf("You entered the alphanumeric character %c\n", c); 10 11 return 0; 12 } isalnum()用法 (5)isalpha() 语法: #include <ctype.h> int isalpha(char ch); 功能:如果参数是字母字符,函数返回非零值,否则返回零值 1 #include <ctype.h> ...