CareerCup

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;


public class pixel {
	
	public static void main(String[] args){
		try{
		FileInputStream f = null;
		String line;
		int linecount=0;
		ArrayList  rows=new ArrayList();
		int checker=0;
		boolean flag=true;
		f = new FileInputStream("sample.txt");
		BufferedReader br = new BufferedReader(new InputStreamReader(f));
		while ((line = br.readLine()) != null) {
			if(line.length()==1000){
				for(int i=0;i<line.length();i++){
					if(!(line.charAt(i)=='1')){
						flag=false;
						checker++;
						break;
					}
				}
				if(flag || checker>1000){
					if(checker>1000){
					rows.add(linecount);
					}
					else{
						rows.add(linecount+1);
					}
					checker=0;
				}
				linecount++;
				flag=true;
			}
		}
		for(int i=0;i<rows.size();i++){
			System.out.print(rows.get(i) + "\n");
		}
		}
		catch(Exception e){
			System.out.print("Error");
		}
		}
	}

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;


public class pixel {
	
	public static void main(String[] args){
		try{
		FileInputStream f = null;
		String line;
		int linecount=0;
		ArrayList  rows=new ArrayList();
		int checker=0;
		boolean flag=true;
		f = new FileInputStream("sample.txt");
		BufferedReader br = new BufferedReader(new InputStreamReader(f));
		while ((line = br.readLine()) != null) {
			if(line.length()==1000){
				for(int i=0;i<line.length();i++){
					if(!(line.charAt(i)=='1')){
						flag=false;
						checker++;
						break;
					}
				}
				if(flag || checker>1000){
					if(checker>1000){
					rows.add(linecount);
					}
					else{
						rows.add(linecount+1);
					}
					checker=0;
				}
				linecount++;
				flag=true;
			}
		}
		for(int i=0;i<rows.size();i++){
			System.out.print(rows.get(i) + "\n");
		}
		}
		catch(Exception e){
			System.out.print("Error");
		}
		}
	}

Please comment, if my understanding is wrong and if you find any issues in the code.

anyone elaborate on this question? I don't understand the question