- Java Programming Examples
- Example - Home
- Example - Environment
- Example - Strings
- Example - Arrays
- Example - Date & Time
- Example - Methods
- Example - Files
- Example - Directories
- Example - Exceptions
- Example - Data Structure
- Example - Collections
- Example - Networking
- Example - Threading
- Example - Applets
- Example - Simple GUI
- Example - JDBC
- Example - Regular Exp
- Example - Apache PDF Box
- Example - Apache POI PPT
- Example - Apache POI Excel
- Example - Apache POI Word
- Example - OpenCV
- Example - Apache Tika
- Example - iText
- Java Tutorial
- Java - Tutorial
- Java Useful Resources
- Java - Quick Guide
- Java - Useful Resources
How to use finally block for catching exceptions in Java
Problem Description
How to use finally block for catching exceptions?
Solution
This example shows how to use finally block to catch runtime exceptions (Illegal Argument Exception) by the use of e.getMessage().
public class ExceptionDemo2 { public static void main(String[] argv) { new ExceptionDemo2().doTheWork(); } public void doTheWork() { Object o = null; for (int i = 0; i < 5; i++) { try { o = makeObj(i); } catch (IllegalArgumentException e) { System.err.println("Error: ("+ e.getMessage()+")."); return; } finally { System.err.println("All done"); if (o == null) System.exit(0); } System.out.println(o); } } public Object makeObj(int type) throws IllegalArgumentException { if (type == 1)throw new IllegalArgumentException("Don't like type " + type); return new Object(); } }
Result
The above code sample will produce the following result.
All done java.lang.Object@1b90b39 Error: (Don't like type 1). All done
The following is an another sample example of finally block in java
public class HelloWorld { public static void main(String []args) { try { int data = 25/5; System.out.println(data); } catch(NullPointerException e) { System.out.println(e); } finally { System.out.println("finally block is always executed"); } System.out.println("rest of the code..."); } }
The above code sample will produce the following result.
5 finally block is always executed rest of the code...
java_exceptions.htm
Advertisements