import java.util.StringJoiner;

public class Main {

public static void main(String[] args) {

String[] fields = { "name", "position", "salary" };

String table = "employee";

String select = buildSelectSql(table, fields);

System.out.println(select);

System.out.println("SELECT name, position, salary FROM employee".equals(select) ? "测试成功" : "测试失败");

}

static String buildSelectSql(String table, String[] fields) {

StringJoiner sj = new StringJoiner(", ","SELECT "," FROM " + table);

for(String field: fields) {

sj.add(field);

}

return sj.toString();

}

}