输入流的初始练习

//输入流的初始练习
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

//输入流练习
public class FirstDemo {
    public static void main(String[] args) throws IOException {
        //创建字节输入流对象
        FileInputStream fis=null;
        try {
            fis=new FileInputStream("d:/a.txt");
            int s1=fis.read();
            System.out.println(s1);
            int s2=fis.read();
            System.out.println(s2);
            int s3=fis.read();
            System.out.println(s3);
            int s4=fis.read();
            System.out.println(s4);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }finally {
            try {
                fis.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}