通过逗号拼接数组中字符串

public static void main(String[] args) {
    String[] strings = {"string1", "string2", "string3", "string4", "string5"};
    StringBuilder sb = new StringBuilder();
    for (String str : strings) {
        if (sb.length() > 0) {
            sb.append(",");
        }
        sb.append(str);
    }
    System.out.println(" print sb: " + sb);
}

输出结果：
print sb: string1,string2,string3,string4,string5