Doubt in try and finally block execution.

[Bennet Xavier]

Hi All,

i am not able to understand this program.

i expected null in SOP of main method.

but, it prints Code Ranch.

public class TestFinally {
   public static void main(String[] args) {

         System.out.println("Test:"+new TestFinally().test());

   }

   String test(){
               String str=null;
               str="Code Ranch";
                try{
                         System.out.println("test 1"+str);
                         return str;

               }
               finally{
                        str=null;
                        System.out.println("test 2"+str);

}

}
}

Please Help me.

[Campbell Ritchie]

It won't compile because you haven't declared i.
It doesn't print out CodeRanch. It prints three lines. Please give us full details and explain what you don't understand.

[Patricia Samuel]

 return str+i   

Considering you will manage to compile this code somehow eg. removing or declaring variable i , when we run this program we get the following output

test 1Code Ranch
test 2null
Test:Code Ranch

What does it mean...Simply that method test is run before the main method. See whenever you have static method or block in your class it is loaded first whenever the class is loaded by jvm. So In this case static method test is run before the main method.

I hope it will clear your doubt.

Thanks,
Patricia

[Joanne Neal]

Patricia Samuel wrote:What does it mean...Simply that method test is run before the main method. See whenever you have static method or block in your class it is loaded first whenever the class is loaded by jvm. So In this case static method test is run before the main method.

I'm afraid that's wrong. Only static blocks are run when the class is loaded. Static methods only run when they are called. In this case the test() method is being called from this line in the main method

System.out.println("Test:"+test()); 

[Patricia Samuel]

Yeah Neal... you're right. i made a mistake in writing the post.

Thanks for correcting me.

[Bennet Xavier]

i have updated the code.

please take a look and let me know the reason why its printing Code Ranch.

if java return the final value for the variable inside try block, then there is no meaning of nullifying variables inside finally block.

Thanks In Advance.

Bennet Xavier X.

[Joanne Neal]

Bennet Xavier wrote:i have updated the code.

please take a look and let me know the reason why its printing Code Ranch.

if java return the final value for the variable inside try block, then there is no meaning of nullifying variables inside finally block.

Thanks In Advance.

Bennet Xavier X.

The value returned from the method will be the value of the object that str referenced at the point that the return statement was executed. Making str refer to a different object or null in the finally block will have no effect on the value returned. The only way that the return value can be changed in the finally block is if there is a return statement in there as well.

[Bennet Xavier]

Thank You Very Much.