Reasons Occurring IOException
Some common reasons why IOException takes place are:
- File not found.
- False user input.
- Bad URL for downloading files.
- File permission causes.
- Input/Output device issues.
Example:
Java
// Java code to illustrate IOException import java.io.*; // Driver Class public class Main { // Main Function public static void main(String[] args) throws IOException { // FileReader object FileReader file = new FileReader("file.txt"); // Trying to read a file that doesn't exists System.out.println(file.read()); } } |
Output:
Exception in thread "main" java.io.FileNotFoundException: file.txt (No such file or directory)
at java.base/java.io.FileInputStream.open0(Native Method)
at java.base/java.io.FileInputStream.open(FileInputStream.java:219)
at java.base/java.io.FileInputStream.<init>(FileInputStream.java:157)
at java.base/java.io.FileInputStream.<init>(FileInputStream.java:112)
at java.base/java.io.FileReader.<init>(FileReader.java:60)
at Main.main(Main.java:12)
How to Handle an IOException in Java?
An IOException in Java occurs when we try to perform some input or output tasks and then some issues occur. Programmers need to handle this issue explicitly with a piece of code that executes when an issue occurs. There is an entire class for handling such issues known as the IOException class, which falls under the Java.io package.