封装好的BufferedReader

import java.io.*;
public class Main{
    public static void main(String args[]){
        try {
            BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
            String line;
            int num = 0, fileNum;
            while ((line = in.readLine()) != null) {
                try {
                    fileNum = Integer.parseInt(line.trim());
                } catch (NumberFormatException e) {
                    continue;
                }
                num += fileNum;
            }
            System.out.println(num);
        } catch(IOException e) {
            e.printStackTrace();
        }
    }

}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

class Reader
{
	static BufferedReader reader;
	static StringTokenizer tokenizer;
	
	static void init(InputStream input)
	{
		reader = new BufferedReader(new InputStreamReader(input));
		tokenizer = new StringTokenizer("");
	}
	
	static String next() throws IOException
	{
		while(!tokenizer.hasMoreTokens())
		{
			tokenizer = new StringTokenizer(reader.readLine());
		}
		return tokenizer.nextToken();
	}
	
	static int nextInt() throws  IOException
	{
		return Integer.parseInt(next());
	}
	
	static double nextDouble() throws IOException
	{
		return Double.parseDouble(next());
		
	}
}

public class Main
{
	public static void main(String[] args)
	{
		Reader.init(System.in);
		int n=0;
		double d =0;
		try {
			 n = Reader.nextInt();
			 d = Reader.nextDouble();
			 
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}