题目:
解析:
代码
import java.io.*;
public class Java_2{
public static void main (String[] args){
//*********Found**********
byte buf[] = new byte[5];
int len= 0 ,c1 = 0,c2=0;
//*********Found**********
try{
//*********Found**********
FileInputStream in = new FileInputStream("test.txt");
while((len =in.read(buf,0,5))>0){
for(int i = 0; i < len;i++)
if(buf[i]>= '0' && buf[i] <= '9'){
c1 ++;
}
else
if((buf[i]>= 'a' && buf[i] <= 'z') || buf[i]>= 'A' && buf[i] <= 'Z')
c2++;
if(len <5) break;
}
//*********Found**********
in.close(); //流 的使用打开了一定要关闭
}catch(Exception e ){}
System.out.println("数字数是 " + c1 + ",字母数是 " + c2);
}
}