java - Calling methods of an object that is already stored in an ArrayList -

everything works far in program i'm having trouble section of code:

    else if(input.equals("2")) {         system.out.println("enter stock symbol:");         symbol2 = in.next();         system.out.println("enter number of shares wish sell:");         sellshares = in.nextint();         string tempsymbol = "";         for(int i=0; i<array1.size(); i++) {             tempsymbol = (array1.get(i)).getsymbol();             if(symbol2.equals(tempsymbol)) {                 system.out.println("the dollar cost averaged price per share (lifo): " + (array1.get(i)).averagecost(sellshares));                 system.out.println("the dollar cost averaged price per share (fifo): " + (array2.get(i)).averagecost(sellshares));             }         }     } 

it'll go through loop tempsymbol = "". why doesn't array1 return anything?

here's code. apologies ahead of time if parts redundant or messy.

    import java.util.*; public class whoop {  public static void main(string[] args) {     scanner in = new scanner(system.in);     string input = "";     string symbol = "";     string name = "";     int shares = 0;     double price = 0;     string symbol2 = "";     int sellshares = 0;     int rolling = 0;     stack thestack = null;     queue theq = null;     string loopcheck = "1";     arraylist<stack> array1 = new arraylist<stack>();     arraylist<queue> array2 = new arraylist<queue>();  while(loopcheck.equals("1")) {     system.out.println("press 1 enter new stock or press 2 find lifo , fifo dollar cost average number of shares sold");     input = in.next();      if(input.equals("1")) {         system.out.println("enter stock symbol:");         symbol = in.nextline();         in.nextline();         system.out.println("enter stock name:");         name = in.nextline();          system.out.println("enter number of shares bought:");         shares = in.nextint();         system.out.println("enter price per share when purchased");         price = in.nextdouble();         thestack = new stack(symbol,name,shares,price);         theq = new queue(symbol,name,shares,price);         system.out.println("press 1 continue entering new shares or press 2 finish input " + thestack.getname());         rolling = in.nextint();         while(rolling == 1) {             system.out.println("enter number of shares bought:");             shares = in.nextint();             system.out.println("enter price per share when purchased");             price = in.nextdouble();             thestack.bigpush(shares, price);             theq.bigadd(shares, price);             system.out.println("press 1 continue entering new shares or press 2 finish input " + thestack.getname());             rolling = in.nextint();         }         array1.add(thestack); //i added objects after values finalized         array2.add(theq);     }      else if(input.equals("2")) {         system.out.println("enter stock symbol:");         symbol2 = in.next();         system.out.println("enter number of shares wish sell:");         sellshares = in.nextint();         string tempsymbol = "";         for(int i=0; i<array1.size(); i++) {             tempsymbol = (array1.get(i)).getsymbol();             if(symbol2.equals(tempsymbol)) {                 system.out.println("the dollar cost averaged price per share (lifo): " + (array1.get(i)).averagecost(sellshares));                 system.out.println("the dollar cost averaged price per share (fifo): " + (array2.get(i)).averagecost(sellshares));             }         }     }     else {         system.out.println("input invalid ):");         system.exit(0);     }      system.out.println("press 1 continue working stocks or press else finish up");     loopcheck = in.next();      }     system.out.println("end"); } 

}

this queue class works fine.

    import java.util.linkedlist;     public class queue<e> {  private linkedlist<double> linklist; private string symbol; private string name; private int shares; private double price;  public queue(string symbol2, string name2, int shares2, double price2) {      linklist = new linkedlist<double>();     shares = shares2;     price = price2;     symbol = symbol2;     name = name2;     bigadd(shares, price); }     public string getname() {        return name;    }     public string getsymbol() {        return symbol;    }  public void add(double e) {     linklist.add(e); }  public double take() {     return linklist.poll(); }         public void bigadd (int shares2, double price2) {      while(shares2>0) {         linklist.add(price2);         shares2--;     } }  public double averagecost(int shares2) {     double average = 0;     int sizer = 0;     while(sizer < shares2) {         average = average + linklist.poll();         sizer++;     }     average = average/shares2;     return average; } 

and stack class works fine.

    import java.util.*;     public class stack {      private arraylist<double> stackarray = new arraylist<double>();    private int top;    private string symbol;    private string name;    private int shares;          private double price;     public stack(string symbol2, string name2, int shares2, double price2) {       symbol = symbol2;       name = name2;       shares=shares2;       price=price2;       top = -1;       bigpush(shares, price);    }     public double averagecost(int shares2) {        double average = 0;        int sizer = shares2;        while(sizer > 0) {             average = average + stackarray.get(top--);             sizer--;         }        average = average/shares2;        return average;    }     public void push(double value) {       stackarray.add(++top, value);    }    public double pop() {       return stackarray.get(top--);    }     public string getname() {        return name;    }     public string getsymbol() {        return symbol;    }     public void bigpush(int shares2, double price2) {        while(shares2>0) {             stackarray.add(++top, price2);             shares2--;         }    }     public static void main(string[] args) {        stack thestack = new stack("dave", "franco", 2,10.0);        thestack.bigpush(2,20.0);        system.out.println(thestack.getsymbol());    } 

}

also heres example of output:

    press 1 enter new stock or press 2 find lifo , fifo dollar cost average number of shares sold     1     enter stock symbol:     dave     enter stock name:     franco     enter number of shares bought:     5     enter price per share when purchased     5     press 1 continue entering new shares or press 2 finish input franco     2     press 1 continue working stocks or press else finish     1     press 1 enter new stock or press 2 find lifo , fifo dollar cost average number of shares sold     2     enter stock symbol:     dave     enter number of shares wish sell:     1     //and nothing here when should return averagecost()     press 1 continue working stocks or press else finish 

following long code, tt looks boils down wrong usage of scanner class :

while(loopcheck.equals("1")) {     system.out.println("press 1 enter new stock or press 2 find lifo , fifo dollar cost average number of shares sold");     input = in.next();      if(input.equals("1")) {         system.out.println("enter stock symbol:");         symbol = in.nextline(); // problem here         in.nextline(); 

this assigns empty string symbol, because consumes end of line of previous in.next().

if change :

while(loopcheck.equals("1")) {     system.out.println("press 1 enter new stock or press 2 find lifo , fifo dollar cost average number of shares sold");     input = in.next();     in.nextline();     if(input.equals("1")) {         system.out.println("enter stock symbol:");         symbol = in.nextline(); 

it work.

edit :

it looks aware of need call in.nextline() without using returned value, put in.nextline() in wrong place.