To find the greater no. between two numbers

class Pro6
{
public static void main(String arg[])
{
int a,b;
a=Integer.parseInt(arg[0]);
b=Integer.parseInt(arg[0]);
if(a>b)
{
System.out.print("a is greater than b");
}
else
{
System.out.print("b is greater than a");
}
}
}