java - 使用StringBuilder时从最后删除了逗号

我有以下Java程序，但我不想在最后一个元素之后分配“，”，怎么办？

String range = "400-450";
        Integer startRange = null;
        Integer endRange = null;
        StringTokenizer st = new StringTokenizer(range,"-");
        while(st.hasMoreTokens()) {
            startRange = Integer.parseInt(st.nextToken());
            endRange= Integer.parseInt(st.nextToken());
        }
        StringBuilder sb = new StringBuilder();
        for (int i = startRange; i <= endRange; i++) {
            sb.append(i).append(",");
        }
        System.out.println(sb);

输出应为
400,401,402,403,404,405,406,407,408,409,410,411,412,413,414,415,416,417,418,419,420,421,422,423,424,425,426,427,428,429,430,431,432,433,434,435,436,437,438,439,440,441,442,443,444,445,446,447,448,449,450->最后没有逗号

最佳答案

就像

for (int i = startRange; i <= endRange; i++) {
   sb.append(i);
   if(i != endRange)
        sb.append(",");
}