package DateStructuresHomework;
import java.util.Scanner;
public class Comparable {
public static Comparable getMax(Comparable []a)
{
int k=0;
for (int i = 1; i <a.length ; i++)
{
if (a[i].compareTo(a[k])>0)
{
k=i;
}
return a[k];
}
}
public static void main(String[] args) {
Scanner in=new Scanner(System.in);
int n=in.nextInt();
Comparable []a=new Comparable[n];
for (int i = 0; i < n; i++)
{
a[i]=in.next();
}
System.out.println(getMax(a));
}
}

为什么compareTo用不了,应该怎么改
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