Explain the output? ( Anonymous Arrays)

[Srikanth CS]

Class A{
public static void main{
System.ou.println(new int[] {1,2,3,4,5});
}
}

What dose it print in the output screen and why???


Thank you in advance.

[Chandra Bhatt]

Hi Srikanth,

Code has compiler error!!!

[Barry Gaunt]

Did you compile and run it? If not do so. If you do not understand the output that was printed, then ask again.

And please check our JavaRanch Naming Policy and change your displayed name to conform with it. I believe that you have been previously requested to do so in another topic's thread.

[Barry Gaunt]

As Chandra Bhatt pointed out, the code you have presented here is just wasting peoples' time.

[Suman Sharma]

Srikanth,
It gives compiler error because of incorrect use of System.ou.println.
If it is a typing error and it should be Syste.out.println, it will output the memory address of the array object only. It does not print elements of the array object because it does not access array elements in this code.
-Suman

[Vidya Singh]

The correct code
class A{
public static void main (String args[]){
System.out.println(new int[] {1,2,3,4,5});
}
}

would print memory address of Anonymous array

[Suman Sharma]

Sorry, it should be System.out.println, not Syste.out.println. My computer has a problem. Suddenly a black screen appears and I miss a letter even if I type it.
-Suman

[Srinivasan thoyyeti]

Hi Srikanth,

I found some interesting observation with your code.

output
[S@1b90b39 --> Sop(new short[] {1,2,3,4,5});
[I@1b90b39 --> Sop(new int[] {1,2,3,4,5});
[B@1b90b39 --> Sop(new byte[] {1,2,3,4,5});

1.Array's are represented as objects in java.
2.Object's toString() method displays fallowing information:
className@hashCode.

in our case its an array.
So for class name it has taken

S for short
I for int
B for byte.
fallowed by @ , 1b90b39(hashcode).

Please get back to me ...

[Srinivasan thoyyeti]

The above pattern works for byte,short,int,float,double arrays.
But will not work for char and long !

Why doesn't work for char:Reason: PrintStream has function which takes char[] and prints the contents.
void println(char[] x)
Print an array of characters and then terminate the line.

Why doesn't work for long:
I too don't know.
But i got this result: [J@1b90b39.

I think its waste of time in certification view point.
Any way have nice time. I think we are crossing boundaries.

[Chandra Bhatt]

Hi Srini,

1- For long prefix "J" J@hashCode
2- for char some three boxes

Good observation! But reason unknown!


reply my equals() post please!!!

cmbhatt

[Keith Lynn]

I don't know their reasoning, but the class name for a long[] is [J.

public class Test36 {
 
   public static void main(String[] args) {
      long[] l = new long[]{1,2,3,4,5};
 
      System.out.println(l.getClass().getName());
   }
 
}

prints [J

The reason that SOP acts differently with a long[], int[], float[], double[], etc. than with a char[] is that there is a method named println in PrintStream which matches char[], but the only println method that the other arrays match is the one that accepts Object.

[Burkhard Hassel]

Both Suman and Vidya wrote that

(whatever) would print out the memory adress of (something).

No way.
Java is platform independent.

Bu.

[Suman Sharma]

Date problem.

Can anyone tell me how I can enter following data in publisher table?

PublishID, PublishDate, AuthId
111, 07-06-05, SSS

It is giving problem with entering the date value.

Thanks.