java - Cannot find symbol: method add -

why receiving following error: cannot find symbol: method add? code:

import java.util.*  public class arraylist {     // instance variables - replace example below own     public void processinput(string s) {         int[] = { 34, 25, 16, 98, 77, 101, 24 };          arraylist b = new arraylist();          (int = 0; < a.length; i++) {             int d = a[i];             if (d % 2 > 0) {                 b.add(new integer(d));             }         }          (int = 0; < b.size(); i++) {             system.out.print(b.get(i) + " ");         }          (int = a.length - 1; >= 0; i--) {             system.out.print(a[i] + " ");         }     } } 

how can resolve error?

reading question again, assume missing

import java.util.*; 

at start of class. way getting error. btw should getting error "cannot resolve symbol arraylist" tells problem is.

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change last loop

for(int = a.length-1; >= 0; i--) { 

with experience able read error messages , understand mean. in case

exception in thread "main" java.lang.arrayindexoutofboundsexception: 7 @ main.main(main.java:33) 

on line 33, (or ever in code) tried accessed index beyond end of array. last element of array a a.length-1 because first element 0

it important read error message because best clue problem , how fix it.

when post question should post error getting.