import java.io.*;public class A{    public static void main(String[] args) throws IOException   {        BufferedReader buf;//定义BufferedReader 的对象buf        String str;        ...............        buf = new BufferedReader(new InputStreamReader(System.in));//创建buf对象       str = buf.readLine();//用readLine方法读取字符        ...............  }

import java.uti.*;public class A{     public static void main(String[] args)    {          Scanner buf=new Scanner (System.in);           int i;double j;           System.out.println("请输入一个值：");           i=buf.nextInt();           System.out.println("请输入一个值：");           j=buf.nextDouble();                   ................}