java输入外挂

参考https://blog.youkuaiyun.com/lvlinfeng970/article/details/79922263改写，若测出BUG，请提出，谢谢。

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.StringTokenizer;

public class Main {
	public static void main(String[] args) {
		InputReader in = new InputReader(System.in);
		PrintWriter out = new PrintWriter(System.out);// 输出挂
		while (in.hasNext()) {
			String s = in.next();
			out.println(s);
			// out.write(s);//无换行
		}
		out.close();// 必须加，运行完此句一起输出
	}

	static class InputReader {
		public BufferedReader reader;
		public StringTokenizer tokenizer;

		public InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		}

		public boolean hasNext() {
			while (tokenizer == null || !tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (Exception e) {
					return false;
				}
			}
			return true;
		}

		public String next() {
			if (hasNext())
				return tokenizer.nextToken();
			return null;
		}

		public String nextLine() {
			if (hasNext())
				return tokenizer.nextToken("");
			else
				return null;
		}

		public int nextInt() {
			return Integer.parseInt(next());
		}

		public long nextLong() {
			return Long.parseLong(next());
		}

		public double nextDouble() {
			return Double.parseDouble(next());
		}

		public BigInteger nextBigInteger() {
			return new BigInteger(next());
		}

		public BigDecimal nextBigDecimal() {
			return new BigDecimal(next());
		}
	}

}