What is the mistake in form biggest number code of mine

#1

import java.util.*;
public class Main {
public static void main(String args[]) {
Scanner sc=new Scanner(System.in);
int t=sc.nextInt();
int i,j;
for(i=1;i<=t;i++)
{
int n=sc.nextInt();
int a[]=new int[n];
String b[]=new String[n];
for(j=0;j<n;j++)
{
a[j]=sc.nextInt();
b[j]=Integer.toString(a[j]);
}
Arrays.sort(b);
for(j=n-1;j>=0;j–)
{
System.out.print(b[j]);
}
System.out.println();
}
}
}

#2

@rahul.parasmani,
For the input:
1
2
98 9
Your code will give 989 but the correct answer is 998

#3

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