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一、快读-BufferedReader实现
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注意:BufferedReader需要抛异常(throws IOException)
class in
{
static BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
static StringTokenizer tokenizer = new StringTokenizer("");
// nextLine()读取字符串
static String nextLine() throws IOException { return reader.readLine(); }
// next()读取字符串
static String next() throws IOException
{
while (!tokenizer.hasMoreTokens()) tokenizer = new StringTokenizer(reader.readLine());
return tokenizer.nextToken();
}
// 读取一个int型数值
static int nextInt() throws IOException { return Integer.parseInt(next()); }
// 读取一个double型数值
static double nextDouble() throws IOException { return Double.parseDouble(next()); }
// 读取一个long型数值
static long nextLong() throws IOException { return Long.parseLong(next());}
// 读取一个BigInteger
static BigInteger nextBigInteger() throws IOException
{
BigInteger d = new BigInteger(in.nextLine());
return d;
}
}
二、快写-PrintWriter实现
注意:
1、PrintWriter也需要抛异常(throws IOException)
2、需要手动刷洗缓存区,要不然不输出(pw.flush();)
三、实操代码
package hly;
import java.io.*;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Arrays;
import java.util.HashMap;
import java.util.StringTokenizer;
class in
{
static BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
static StringTokenizer tokenizer = new StringTokenizer("");
// nextLine()读取字符串
static String nextLine() throws IOException { return reader.readLine(); }
// next()读取字符串
static String next() throws IOException
{
while (!tokenizer.hasMoreTokens()) tokenizer = new StringTokenizer(reader.readLine());
return tokenizer.nextToken();
}
// 读取一个int型数值
static int nextInt() throws IOException { return Integer.parseInt(next()); }
// 读取一个double型数值
static double nextDouble() throws IOException { return Double.parseDouble(next()); }
// 读取一个long型数值
static long nextLong() throws IOException { return Long.parseLong(next());}
// 读取一个BigInteger
static BigInteger nextBigInteger() throws IOException
{
BigInteger d = new BigInteger(in.nextLine());
return d;
}
}
public class Main
{
public static void main(String[] args) throws IOException
{
PrintWriter pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));
// 读入int
int a = in.nextInt();
pw.println(a);
// 读入long
long b = in.nextLong();
pw.println(b);
// 读入double
double c = in.nextDouble();
pw.println(c);
// 读入字符串
// nextLine方式输入的字符串可以含有空格(空格字符也会存储在字符串里面),也就是说它是以回车作为输入的结束符。
String s1 = in.nextLine();
pw.println(s1);
// 读入字符串
// next输入的字符串不能含有空格,它以空格、tab、回车作为输入的结束符。
String s2 = in.next();
pw.println(s2);
// 读入BigInteger
BigInteger d = in.nextBigInteger();
pw.append("" + d);
pw.flush();
}
}
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