public class StringBuilderDemo {    public static void main(String[] args) {        String[] fields = {"name", "position", "salary"};        String table = "employee";        String insert = buildInsertSql(table, fields);        System.out.println(insert);        String s = "INSERT INTO employee (name, position, salary) VALUES (?, ?, ?)";        System.out.println(s.equals(insert) ? "测试成功" : "测试失败");    }    static String buildInsertSql(String table, String[] fields) {        // TODO:        StringBuilder sb = new StringBuilder();        sb.append("INSERT INTO ")                .append(table)                .append(" (")                .append(String.join(", ", fields))                .append(") VALUES (?, ?, ?)");        return sb.toString();    }}