Java Puzzlers笔记--puzzle 20: What's my Class? String.replaceAll()的使用

package com.javapuzzlers
public class Me{
   public static void main(String[] args){
      System.out.println(Me.class.getName().replaceAll(".","/") + ".class");
   }
}

Solution:

               显示：///////////////////.class

              replaceAll中的特别规则表达式："."代表所有字符，所以上面的程序把所有字符转成：“/”;

TID:

        String.replaceAll takes a regular expression as its first parameter.

         The regular expression "." matches any single character, and so every character of the class name is replaced by a slash producing the output we saw.

Correctly:

package com.javapuzzlers
public class Me{
   public static void main(String[] args){
      System.out.println(Me.class.getName().replaceAll("//.","/") + ".class");
   }
}

or in release 5.0 :

package com.javapuzzlers
public class Me{
   public static void main(String[] args){
      System.out.println(Me.class.getName().replaceAll(Pattern.quote("."),"/") + ".class");
   }
}