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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12.     	String sentence = "hello world! 722";
  13.     	String str = sentence.replaceAll("[a-zA-Z]", "@");
  14.     	System.out.println(str); // "@@@@@ @@@@@! 722"
  15. 	}
  16. }
Success #stdin #stdout 0.07s 380224KB
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Standard input is empty
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@@@@@ @@@@@! 722
https://ideone.com/PUgewO
language:
Java (12.0.1)
created:
10 years ago
visibility:
secret

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