java中最易犯错的特殊字符示例详解

    System.out.println(        String.class.getName()+ ".class");    System.out.println(        String.class.getName().        replaceAll(".","/") + ".class");

java.lang.String.class

java/lang/String/class

////////////////.class

    System.out.println(        String.class.getName().        replaceAll("//.","/") + ".class");  

    System.out.println(        String.class.getName().        replaceAll("//Q.//E","/") + ".class");  

    System.out.println(        String.class.getName().        replaceAll(Pattern.quote("."),"/") + ".class");  

/** * Returns a literal pattern <code>String</code> for the specified * <code>String</code>. * * <p>This method produces a <code>String</code> that can be used to * create a <code>Pattern</code> that would match the string * <code>s</code> as if it were a literal pattern.</p> Metacharacters * or escape sequences in the input sequence will be given no special * meaning. * * @param s The string to be literalized * @return A literal string replacement * @since 1.5 */ public static String quote(String s) { int slashEIndex = s.indexOf("//E"); if (slashEIndex == -1) return "//Q" + s + "//E"; StringBuilder sb = new StringBuilder(s.length() * 2); sb.append("//Q"); slashEIndex = 0; int current = 0; while ((slashEIndex = s.indexOf("//E", current)) != -1) { sb.append(s.substring(current, slashEIndex)); current = slashEIndex + 2; sb.append("//E////E//Q"); } sb.append(s.substring(current, s.length())); sb.append("//E"); return sb.toString(); }

import java.util.regex.Matcher;import java.util.regex.Pattern; public class CheckSpecialCharacterString {  /** * Check whether the each character of String is special character or not using java * @author www.instanceofjava.com */ public static void main(String[] args) {String Str="Java String interview questions*$%"; String specialCharacters=" !#$%&'()*+,-./:;<=>?@[]^_`{|}"; for (int i = 0; i < Str.length(); i++) {  if (specialCharacters.contains(Character.toString(Str.charAt(i)))) {  System.out.println(Str.charAt(i)+": is a special character"); }  } } }