What is the functionality of the following piece of Java code?

[answerhappygod]

Assume: ‘a’ is a non empty array of integers, the Stack class creates an array of specified size and provides a top pointer indicating TOS(top of stack), push and pop have normal meaning.
public void some_function(int[] a)
{
Stack S=new Stack(a.length);
int[] b=new int[a.length];
for(int i=0;i<a.length;i++)
{
S.push(a);
}
for(int i=0;i<a.length;i++)
{
b=(int)(S.pop());
}
System.out.println("output :");
for(int i=0;i<b.length;i++)
{
System.out.println(b);
}
}
a) print alternate elements of array
b) duplicate the given array
c) parentheses matching
d) reverse the array