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题解 | #统计字符串中字母出现次数#

方法一： import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); ...

Java StringBuilder

2021-10-15

0 538

题解 | #统计字符串中字母出现次数#

replace yyds import java.util.Scanner; public class Main { public static void main(String[] args) { String string = "H e l l o ! n o w c ...

Java

2021-10-15

155 2240

题解 | #统计一句话中重复单词的个数#

使用Map的getOrDefault方法 import java.util.*; public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(Syste...

Java Map getOrDe***t

2021-10-14

0 543

题解 | #类型判断#

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

Java

2021-10-14

0 365

题解 | #日期换算#

Java SimpleDateFormat的API运用 import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Scanner; publ...

Java

2021-10-14

0 411

题解 | #创建单例对象#

线程安全，双重校验 public class Main { public static void main(String[] args) { Singleton s1 = Singleton.getInstance(); Singleton s2 = Sin...

Java 单例模式

2021-10-14

0 393

题解 | #集合排序#

import java.util.ArrayList; import java.util.Collections; import java.util.List; import java.util.Scanner; public class Main { public static void...

Java 自定义排序

2021-10-14

0 481

题解 | #简单运算#

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

Java

2021-10-14

236 5727

题解 | #四舍五入#

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

Java

2021-10-14

37 807

题解 | #交换变量值#

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

Java

2021-10-14

133 3837