自己在网上冲浪和自己整理，形成了一个Java快读模板;(会长期改进的,博主从c++转Java了，正在慢慢熟悉)

import java.io.*;
import java.util.*;

class Read {
    StreamTokenizer st = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
    BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));

    public int nextInt() throws Exception {
        st.nextToken();
        return (int) st.nval;
    }

    public long nextLong() throws Exception {  
        st.nextToken();
        return (long) st.nval;
    }

    public double nextDouble() throws Exception {
        st.nextToken();
        return (double) st.nval;
    }

    public String nextString() throws Exception {
        return bf.readLine();  
    }

    public void close() throws Exception {
        bf.close();
    }

    // 使用空格分割字符串
    public String[] nextChars() throws Exception {
        String line = bf.readLine();
        String[] lines = line.split(" ");
        return lines;
    }
}

public class Main {
    public static void main(String[] args) throws Exception {

        Read rb = new Read();
        System.out.println("读入一个字符串!!!!");
        String[] chars = rb.nextChars();
        
        for (String it : chars) {
            System.out.println(it);
        }
        System.out.println("读入一个int");
        int a = rb.nextInt();
        System.out.println("读入一个String");
        String b = rb.nextString();

        System.out.println("读入一个Double");
        Double c = rb.nextDouble();

        System.out.println("读入一个long");
        long d = rb.nextLong();

        System.out.println("读入一个字符");
        char tem = rb.nextString().charAt(0);

        System.out.println("关闭流");
        rb.close();
        
        return ;
    }
}