What is end of input character?

[justme]

Hi there!
What is end of input character? I wanted to read in input from standard input and find a max but i don't know it does not work. Here is my code:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Scanner;

public class maxNum {
	public static void main(String[] args) throws IOException{
		BufferedReader buff=new BufferedReader(new InputStreamReader(System.in));
		ArrayList<Integer> arr= new ArrayList<Integer>();
	//	String s;
		//Integer i=0;
		while(buff.read()!=-1){
			arr.add(buff.read());
		}
		Integer max=0;
		for(int j=0; j<arr.size(); j++){
			max=Math.max(max, arr.get(j));
		}
		System.out.println(max);
	}
}

Any help? thanks in advance!

[Tolls]

while(buff.read()!=-1) {
   arr.add(buff.read());
}

You read twice. That means you are only actually reading half the bytes into your array.
You need to assign that first read to a variable and then add that variable to your array.