주민번호 OR 사업자등록번호 짤라서 ***붙이기

public class Test {

 public static final String getJumin(String str) {

  String str1 = str;

   if( str1 == null){
    return "Number is null";
   }else if(str1.length() == 10){
    return str1.substring(0, 3) + "-" + str1.substring(3, 5) + "-" + str1.substring(5, 6) +"****";
   }else if(str1.length() == 13){
    return str1.substring(0, 6) + "-" + str1.substring(6, 7)+ "******";
   }else{
    return "wrong number";
   }
  }
  public static void main(String [] args){
   //String jumin_num = getJumin("8211061234567");
   String jumin_num = getJumin("1168169356");
   System.out.println("주민 번호: "+jumin_num);
  }
}

Test.java