Java去除字符串中的空格,回车,换行符,制表符

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();
}
} 

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