Java Examples - Use of Finally

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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; i7lt;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


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