same string but it return false while using equals method with two StringBuilder objects

Question

Scanner s = new Scanner(System.in);
        char[] ch = s.next().toCharArray();
        Arrays.sort(ch);
        StringBuilder sb = new StringBuilder();
        sb.append(ch);
        int n = s.nextInt();
        while (n-- > 0) {
            char[] book = s.next().toCharArray();
            Arrays.sort(book);
            StringBuilder sb2 = new StringBuilder();
            sb2.append(book);           
            System.out.println(sb.equals(sb2));

        }
it returns false.
input
act
1
cat
output
false

i tried to check two string are same or not without working with array but input will be in array.