java输入输出的两种方法

import java.util.Scanner;
 class Scanners{


     public static void main(String args[]){
     Scanner scanner = new Scanner(System.in);
     int guess ;
     guess =scanner.nextInt();
     System.out.println(guess);
     //System.out.println("HelloWorld!");
     //System.out.println("HelloWorld!");
     }

}

另一种

import java.io.*;
class reader{
public static void main(String[] args)throws IOExpection
{
BufferedReader reader =new BufferedReader(new InputStreamReader(System.in));
System.out.println(reader.readLIne());
}
}