下面是完整的Java代码示例,实现了判断字符串是否为数字或字母的功能: publicclassStringUtil{publicstaticbooleanisAlphaNumeric(Stringstr){for(charc:str.toCharArray()){if(Character.isDigit(c)||Character.isLetter(c)){continue;}else{returnfa
另外一种方法是逐个遍历字符串中的字符并判断其是否为字母或数字,我们可以使用Character.isLetterOrDigit方法。以下是相应的代码示例: publicclassStringValidator{publicstaticbooleanisAlphanumeric(Stringstr){if(str==null||str.isEmpty()){returnfalse;}for(charc:str.toCharArray()){if(!Character.isLetterOrDigit...
The Character class wraps a value of the primitive type char in an object. An object of class Character contains a single field whose type is char. In addition, this class provides a large number of static methods for determining a character's category (lowercase letter, digit, etc.) and...
The "Mathematical Alphanumeric Symbols" Unicode Block. [Android.Runtime.Register("MATHEMATICAL_ALPHANUMERIC_SYMBOLS")] public static Java.Lang.Character.UnicodeBlock MathematicalAlphanumericSymbols { get; } Property Value Character.UnicodeBlock Attributes RegisterAttribute Remarks Portions of this page are...
a: old character that we need to replace. b: new character which needs to replace the old character. Return Value: Resultant string after replacements. In this approach, we loop over the string and find whether the current character is non-alphanumeric or not using its ASCII value (as we...
public class PalindromeIgnoreNonAlphanumeric { public static void main(String[] args) { //可以使用javax.swing.JOptionPane类中的showInputDialog()方法提示用户输入字母或者数字串 String s = JOptionPane.showInputDialog("请输入输入字符串:"); //调用isPalindromeByBuffer()方法 ...
public static final class Character.UnicodeBlock extends Character.Subset A family of character subsets representing the character blocks in the Unicode specification. Character blocks generally define characters used for a specific script or purpose. A character is contained by at most one Unicode block...
{Lower} A lower-case alphabetic character: [a-z] \p{Upper} An upper-case alphabetic character:[A-Z] \p{ASCII} All ASCII:[\x00-\x7F] \p{Alpha} An alphabetic character:[\p{Lower}\p{Upper}] \p{Digit} A decimal digit: [0-9] \p{Alnum} An alphanumeric character:[\p{Alpha}\p...
digit Succeeds if the next character is a digit. The character intr Parses an integer. The integer dble Parses a double. The double string(s) Parses the supplied string. The string alphaNum Parses an alphanumeric string. The string regex(regex) Parses a string matching the supplied regex...
Numeric digit Use \d+ for an integer; see Using regexes in Java: Test for a Pattern \D A nondigit character \s Whitespace Space, tab, etc., as determined by java.lang.Character.isWhitespace() \S A nonwhitespace character See Program: Apache Logfile Parsing Unicode blocks (representative ...