"JAVA", "ReplaceAll", "cheat"

There is a method in the Java string class called: ReplaceAll, on the surface, he means to replace all the regex with replacement.

1      Public string ReplaceAll (string regex, string replacement) {2         return Pattern.compile (regex). Matcher (this). ReplaceAll (replacement); 3     }

But in fact, it does not:

1      Public Static void Main (string[] args) {2         String str= "AAA"; 3         System.out.println (Str.replaceall ("AA", "a")); 4     }

The result is:

Aa

So, this method is deceptive.

The real replaceall should be this:

1  void replaceall (String str, string regex, string replacement) {2         if (Str.contains (regex)) {3             str = Str.replaceall (regex, replacement); 4             replaceall (str, regex, replacement); 5         Else {6            System.out.println (str); 7         }8     }

Test.java

1  Public classTest {2 3      Public Static voidMain (string[] args) {4String str = "AAATTAAAA";5String regex = "AA";6String replacement = "a";7 ReplaceAll (str, regex, replacement);8     }9 Ten      Public Static voidreplaceall (String str, string regex, string replacement) { One         if(Str.contains (regex)) { Astr =Str.replaceall (regex, replacement); - ReplaceAll (str, regex, replacement); -}Else { the System.out.println (str); -         } -     } -}

Output:

Atta

Tool

     Public Static string ReplaceAll (String str, string regex, string replacement) {        if  (Str.contains (regex)) { c7/>= str.replaceall (regex, replacement);            str=replaceall (str, regex, replacement);        }         return str;    }

Purely entertaining:)

"JAVA", "ReplaceAll", "cheat"