_java Java code that intercepts equal-length bytes from a string

When the page is displayed, sometimes the text can not be displayed completely, can only display part of the text, but the direct interception can only intercept the long string, English and Chinese difficult to deal with
So I wrote the following method, intercept the equal length character

Copy Code code as follows:

public static void Main (string[) args) {

  string str = "20 120131: "Home" 1 Hello ";

  system.out.println (subString (str, 10));
 }
 public static string subString (string str, int len) {
  len *= 2;
  byte[]bytes = Str.getbytes ();
  if (bytes.length <= len) {
   return str;
  }

  byte[]newbytes = arrays.copyof (bytes, Len);
  int count = 0;
  for (Byte b:newbytes) {
   if (b < 0) {
    count++;
   }
  }
  if (count% 2!= 0) {

   len + +;
   newbytes = arrays.copyof (bytes, Len);
  }

 
  return new String (newbytes) + "...";