1 public class Demo1_FileInputStream {
 2 
 3     public static void main(String[] args) throws IOException {
 4         //demo1();
 5         FileInputStream fis = new FileInputStream("a.txt");  // 內容為  abc
 6         int x;
 7         while((x = fis.read())!=-1) {
 8             System.out.println(x);
 
 9         }
10     }
11 
12     public static void demo1() throws FileNotFoundException, IOException {
13         FileInputStream fis = new FileInputStream("a.txt");  // 內容為  abc
14         int x = fis.read();                                  // x = 97
15         System.out.println(x);                               //
 
 當 文件中的內容讀完後再讀時  返回值為 -1
16         fis.close();
17     }
18 
19 }

java之IO流