Create add method to add feet and inches java -

i need create add method add feet , inches inputted user. user can input integer in feet or inches, , back, need add values. not sure how can approach that. great!

the following code:

import java.util.scanner; public class mixwithunit_jm {  fraction_jm a; int first;  int second;  public string displaymixwithunit_jm() {   string str="";   if (first == 0) str= first%second+"/"+second+"in";   else if (first%second == 0) str= ""+first/second+"ft";   else if (first < second) str=first+"/"+second+"in";    else str= first/second+"ft" +" "+ first%second+"/"+second+"in";    return str;  }//display   public mixwithunit_jm(string str) {   int pos = str.indexof("ft");   int pos2 = str.indexof("in");    string a1 = "";   string a2 ="";   string b1 = "";   string b2 ="";   string b3 ="";    if(pos == -1){      a2 = str.substring(0,pos2 +2).trim();      b2 = str.substring(0,pos2);      b3 = b2;   }   else if(pos2 == -1){      a1 = str.substring(0,pos +2);      b1 = str.substring(0, pos);      b3 = b1;    }   else{      a1 = str.substring(0,pos +2);      b1 = str.substring(0, pos);      a2 = str.substring(pos +2).trim();      b2 = str.substring(pos+2, str.length()-2);      b3 = b1 + b2;    }    int[] ia= parse (b3);   int top=ia[0]*ia[2]+ia[1];   int bot= ia[2];   = new fraction_jm (top,bot);   int gcd = a.gcd(top,bot);   first=top/gcd;    second =bot/gcd;  }//mix      public static string (){   scanner scan = new scanner (system.in);   string userinput = scan.nextline();   userinput =userinput.trim();   return (userinput);   } //get    public static int[] parse (string userinput){   int inum = 0;   int itop = 0;   int ibot = 1;    userinput = userinput.trim();   int pos = userinput.indexof(" ");    int pos2 = userinput.indexof("/");       if (pos == -1 && pos2 != -1){      pos= userinput.indexof("/");       string stop=userinput.substring(0,pos);      itop = integer.parseint(stop);//second integer      string sbot=userinput.substring(pos+1);      ibot = integer.parseint(sbot);//third integer      //case 2       }     else if (pos == -1 && pos2== -1) {      inum = integer.parseint(userinput);//first integer      //case 1      }     else{      string snum=userinput.substring(0,pos);      inum = integer.parseint(snum);//first integer       string snum2=userinput.substring(pos+1);      pos= snum2.indexof("/");      string stop=snum2.substring(0,pos);      itop = integer.parseint(stop);//second integer       string sbot=snum2.substring(pos+1);      ibot = integer.parseint(sbot);//third integer    }    int[] sa = {inum,itop,ibot};    return (sa);          } //parse    public static void main(string[] args) {   system.out.print("please enter mixed-format number :");   string userinput = mixwithunit_jm.get();   system.out.println("input is: "+userinput);     mixwithunit_jm s = new mixwithunit_jm(userinput);   s.displaymixwithunit_jm();    system.out.print("please enter mixed-format number :");   userinput = mixwithunit_jm.get();   system.out.println("input is: "+userinput);   mixwithunit_jm s2 = new  mixwithunit_jm(userinput);     s2.displaymixwithunit_jm();    }//main }//class 

the program runs, need add method.

you should use system.in.read() read standard input. can find more info in post: what system.in.read return?