Java에서 키보드로 입력하는 방법(코드 포함)

//import java.io.*;
import java.util.*;
public class InputTest{
public static void main(String[] args){
  Scanner in = new Scanner(System.in);    //Scanner类
  System.out.println("Please input a float number:");
  float a = in.nextFloat();    //接收float数据
  System.out.println("Please input a string: ");    //这里试了一下输入String数据，但中间有空格就不能显示，Scanner类还不具有这功能
  Scanner str = new Scanner(System.in);
  System.out.println("The string is :" + str.next());
  System.out.println("The float number is: " + a);
  for(int i = 0;i < 4;i++){
   System.out.println("Please input a int number: ");   //for循环接收int型数据
   int b = in.nextInt();
   System.out.println("The int number is: " + b);
  }
}
}

import java.io.*;
public class InputTest{
public static void main(String[] args) throws IOException{
  BufferedReader buf = new BufferedReader(new InputStreamReader(System.in));
  BufferedWriter buf2 = new BufferedWriter(new FileWriter("abx.txt"));
  String str = buf.readLine();
  while(!str.equals("exit")){
   buf2.write(str);
   buf2.newLine();
   str = buf.readLine();
  }
  buf.close();
  buf2.close();
}
}