java - Deleting a specific number in an ArrayList -

i running problem in code. have arraylist, , have bunch of zeros need remove. mixed in other numbers, want keep. however, when loop, skip on zeros , won't remove them. here code:

public static void main(string[] args) throws filenotfoundexception {      scanner scan = new scanner(new file("input.txt"));      arraylist<double> list = new arraylist<double>();      while(scan.hasnextline()){          list.add(scan.nextdouble());      }       for(int i=1; i<list.size();i+=4){          if(list.get(i)<150000){              list.set(i-1,(double) 0);              list.set(i,(double) 0);              list.set(i+1,(double) 0);              list.set(i+2,(double) 0);          }      }       for(int i=2; i<list.size();i+=4){          if(list.get(i)>22.2){              list.set(i-2,(double) 0);              list.set(i-1,(double) 0);              list.set(i,(double) 0);              list.set(i+1,(double) 0);          }      }       for(int i=3; i<list.size();i+=4){          if(list.get(i)<1100){              list.set(i-3,(double) 0);              list.set(i-2,(double) 0);              list.set(i-1,(double) 0);              list.set(i,(double) 0);          }      }       for(int i=0;i<list.size();i++){          if(list.get(i)==0){              list.remove(i);          }      }       system.out.println(list);  } } 

any appreciated!

you structurally modifying list while remove 0's. use iterator

while (iterator.hasnext()) {    int elem = iterator.next();     if (elem == 0)      iterator.remove(); }  

hope helps. pd: can include code directly in question text using "{}" button