u-s-soldiers

public class StringUtil {

  
 public static void replaceBlank()
 {
  Pattern p = Pattern.compile(\\s*|\t|\r|\n);
  String str="I am a, I am Hello  ok, \n new line ffdsa!";
  System.out.println("before:"+str);
  Matcher m = p.matcher(str);
  String after = m.replaceAll(""); 
  System.out.println("after:"+after);
 }
 
 public static void main(String[] args) {
    replaceBlank();
  }

}