在使用FileInputStream,FileOutputStream和RandomAccessFile类时,我们需要将文件的路径传递给它们的构造函数。如果指定路径中的文件不存在,则会引发FileNotFoundException。
public class Sample { public static void main(String args[]) throws Exception { File file = new File("myFile"); FileInputStream fis = new FileInputStream(file); System.out.println("Hello"); } }
输出结果
Exception in thread "main" java.io.FileNotFoundException: myFile (The system cannot find the file specified) at java.io.FileInputStream.open(Native Method) at java.io.FileInputStream.open(Unknown Source) at java.io.FileInputStream.<init>(Unknown Source) at a5Exception_Handling.NullPointer.main(NullPointer.java:10)