一个 5 位数，判断它是不是回文数

package cskaoyan;
 
public class cskaoyan25 {
    @org.junit.Test
    public void palindromic() {
        java.util.Scanner in = new java.util.Scanner(System.in);
        long number = in.nextLong();
        String str = Long.toString(number);
        char[] ch = str.toCharArray();
        boolean flag = true;
 
        for (int i = 0; i < ch.length / 2; i++) {
            if (ch[i] != ch[ch.length - 1 - i]) {
                flag = false;
                break;
            }
        }
 
        if (flag) {
            System.out.println(number + "是回文数");
        } else {
            System.out.println(number + "不是回文数");
        }
 
        in.close();
    }
}