从键盘输入数据

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1）用bufferedReader，导入io包

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
        ...............  
}

public class A
{
     public static void main(String[] args)
    {
         String str;
         InputStreamReader input=new InputStreamReader(System.in);
         BufferedReader buff=new BufferedReader(input);
         try
         {
               str=buff.readLine();
         }catch(IOException e){
                System.out.println(e.toString);
          }
         int i=Integer.parseInt(s);
       ......................
    }    
}                        

 

　

2）用Scanner，导包uti

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();
        
           ................
}

 

　

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