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Throwing exception in construcutor

Posted on 2001-09-07
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Last Modified: 2006-11-17
If a constructor of an object throws an exception, does the object get created?
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Question by:Ripon070400
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4 Comments
 
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Expert Comment

by:sateesh_babu
ID: 6464108
Constructors cannot throw exception.
0
 

Author Comment

by:Ripon070400
ID: 6464149
This is not true, Constructors of classes can throw exceptions (apologies for object)
For example
public Integer (String s) throws NumberFormatException
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Accepted Solution

by:
erikjensen earned 200 total points
ID: 6464277
When an Exception is thrown from a constructor the object is not created, try this,

create the following class,

class test {
   public int count;
         
    public test() throws Exception {
        throw new Exception("test");
    }
         
    public void inc() {
        count++;
    }
}

and then call the following code,

test testObj = null;
try{
    testObj = new test();
}catch(Exception e){}
         
testObj.inc();  //Error

The resulting error is a null pointer exception indicating the class was not created.
0
 

Expert Comment

by:erikjensen
ID: 6464320
You need to remember that any static variables changed in the constructor before the exception is thrown will change value.
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