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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		BufferedReader buff = new BufferedReader(new InputStreamReader(System.in));
    int size = buff.readLine();
    String[] buff = buff.readLine().split(" ");
    List<Integer> numbers = new ArrayList<>();
    for(String s : buff){
     	numbers.add(Integer.parseInt(s)); 
    }
	}
}

Main.java:13: error: incompatible types: String cannot be converted to int
    int size = buff.readLine();
                            ^
Main.java:14: error: variable buff is already defined in method main(String[])
    String[] buff = buff.readLine().split(" ");
             ^
Main.java:16: error: for-each not applicable to expression type
    for(String s : buff){
                   ^
  required: array or java.lang.Iterable
  found:    BufferedReader
3 errors

Standard output is empty