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题解 | #冒泡排序#

import java.util.Arrays; import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner scanner = new Scan...

2023-11-02

1 322

题解 | #动态字符串#

import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); ...

2023-10-30

1 296

题解 | #创建单例对象#

public class Main { public static void main(String[] args) { Singleton s1 = Singleton.getInstance(); Singleton s2 = Singleton.get...

2023-10-30

1 293

题解 | #重写父类方法#

import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); ...

2023-10-30

1 304

题解 | #实现接口#

import java.util.Scanner; public class Main { public static void main(String[] args) { Comparator comparator = new ComparatorImpl(); ...

2023-10-30

1 275

题解 | #实现抽象方法#

import java.util.Scanner; public class Main { public static void main(String[] args) { // Sub是需要你定义的子类 Base base = new Sub(); ...

2023-10-30

1 318

题解 | #浙江大学用户题目回答情况#

select user_profile.device_id,question_id,result from user_profile,question_practice_detail where question_practice_detail.device_id = user_profile.de...

2023-10-25

1 225

题解 | #分组排序练习题#

select university,avg(question_cnt) as avg_question_cnt from user_profile group by university order by avg_question_cnt;

2023-10-23

1 263

题解 | #分组过滤练习题#

select university,avg(question_cnt) as avg_question_cnt, avg(answer_cnt) as avg_answer_cnt from user_profile group by university having avg_question_c...

2023-10-22

1 204

题解 | #分组计算练习题#

select gender,university,count(device_id) as user_num, avg(active_days_within_30) as avg_active_day, avg(question_cnt) as avg_question_cnt from user_p...

2023-10-21

1 214