java split regex

public static void main(String []args){
         String a = "65@A";
         String[] b = a.split("@");
         for (String s : b) {
             System.out.println("s : "+s);
         }
     }

public static void main(String []args){
         String a = "65|A";
         String[] b = a.split("|");
         for (String s : b) {
             System.out.println("s : "+s);
         }
     }

결과물은 다르다