Why not its ClassCastException?

[m ali]

Hi,

Please anyone let me know why the following code not giving an error at compile time?

 
import java.io.Serializable;
 
class Serial {
public static void main(String... a) {
int[] arr={1,2,3};
Serializable s;
s=arr;                //1
arr=(int[]) s;     //2
}
}  
 

Thanks in Advance.

[Chandra Bhatt]

import java.io.Serializable;
 
class Serial {
public static void main(String... a) {
int[] arr={1,2,3};
Serializable s;
s=arr;                //1
arr=(int[]) s;     //2
}
}

Hi Ali,
Try this,

...
int[] arr= {12,2,7};
Serializable s2= arr;
System.out.println(arr instanceof Serializable); //true
...

Regards,
cmbhatt

[Chandra Bhatt]

Hi Ali,

Object o = new Object();
System.out.println(o instanceof java.io.Serializable); //false

Try this code too,

package serialization;
import java.io.*;
 
class Stone implements Serializable{
public String toString() {
return "Stone Object";
}
}
 
public class SampleSerial {
 
public static void main(String... args) {
Object o1 = new Stone();

ObjectOutputStream out= null;

try{
out = new ObjectOutputStream(
new FileOutputStream("Stone.ser"));
out.writeObject(o1);
out.close();
}catch(Exception e) {
e.printStackTrace();
System.exit(1);
}

/*
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Now De-serialization
 */

o1=null;
ObjectInputStream in=null;

try{
in = new ObjectInputStream( 
new FileInputStream("Stone.ser"));
o1=in.readObject();
in.close();
System.out.println(o1);
}catch(Exception e) {
e.printStackTrace();
System.exit(1);
}
}
}

Runtime type of the o1 is Stone that is Serializable; Allright!
No NonSerializable class exception at runtime!!!



Regards,
cmbhatt

[m ali]

Hi Chandra,

Thanks for your explanation.
In your 2nd explanation the Stone class is marked as Serializable, its ok.
Then what about 1st?, array(Object) is also implemented Serializable interfece?
I think, then only i can able to assign the object reference to Serializable reference. am i correct? please clarify?

Thanks in Advance.