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/* package whatever; // don't place package name! */
 
import java.util.*;
 
/* The class name doesn't have to be Main, as long as the class is not public. */
class Main
{
  public static void main (String[] args) throws java.lang.Exception
  {
     List<Integer> list = new ArrayList<Integer>();
     list.add("hello");
  }
}

Main.java:11: error: no suitable method found for add(String)
     list.add("hello");
         ^
    method List.add(int,Integer) is not applicable
      (actual and formal argument lists differ in length)
    method List.add(Integer) is not applicable
      (actual argument String cannot be converted to Integer by method invocation conversion)
1 error

Standard output is empty