ClassCastException

[geet kaur]

 
 import java.util.*;
public class Sorting
{
public static void main(String[] args)
{
Object[] o={new Integer(10),new String("str"),new Integer(19),new 
 
Boolean(true)};
Arrays.sort(o);//why is it giving the claas cast exception.....????/
 

}
}
 
  

[Christophe Verré]

To sort things, you need to compare them. Can you compare Integers with Strings or Booleans ? Look at the API for Arrays#sort(Object[]). That's what they mean by "all elements in the array must be mutually comparable".

[Ankit Garg]

I think it's because your array is of type Object. and object doesn't implements comparable. Although the elements are all comparable, but not to each other....

[Christophe Verré]

I think it's because your array is of type Object.

It would be fine is the content of the array would be comparable to each other. Like :

Object[] o={new Integer(10),new Integer(2),new Integer(19)};