import  org.apache.regexp.RE;

 public   class  test {
     static  String testString = "780-6778 97897";
 public   static   void  main(String[] args) {
         int  index =  0 ;
        RE re =  new  RE("((-)*([0-9]))");
         while (re.match(testString,index)) {
        System.out.println("<"+re.getParen( 0 )+">"+"  atIndex= "+re.getParenStart( 0 ));
            index = re.getParenEnd( 0 );
        }
    }
}

<7>  atIndex= 0
<8>  atIndex= 1
<0>  atIndex= 2
<-6>  atIndex= 3
<7>  atIndex= 5
<7>  atIndex= 6
<8>  atIndex= 7
<9>  atIndex= 9
<7>  atIndex= 10
<8>  atIndex= 11
<9>  atIndex= 12
<7>  atIndex= 13

 int  жопа =  1 ;
String aa = "dd";
System.out.println(aa.toCharArray()[жопа]);

String aa = "dd";
System.out.println(aa.toCharArray()[ 0 ]);