How to use switch statement in Java and examples
Explanation
1. In the switch statement, the variable type can be: byte, short, int or char. Since JavaSE7, switch supports the String type, and case labels must be string constants or literals.
2. The switch sentence can have multiple case sentences. Each case is followed by a value and a colon.
3. The switch sentence can contain a default branch, which is usually the last branch of the switch sentence (can be at any position, but usually at the last one). When default is executed, the value of no case statement is equal to the variable value. The default branch does not require a break statement.
Example
Scanner in = new Scanner(System.in);
System.out.println("请输入当前月份");
int month = in.nextInt();
switch (month){
case 1 :
System.out.println("一月");break;
case 2 :
System.out.println("二月");break;
case 3 :
System.out.println("三月");break;
case 4 :
System.out.println("四月");break;
case 5 :
System.out.println("五月");break;
case 6 :
System.out.println("六月");break;
case 7 :
System.out.println("七月");break;
case 8 :
System.out.println("八月");break;
case 9 :
System.out.println("九月");break;
case 10 :
System.out.println("十月");break;
case 11 :
System.out.println("十一月");break;
case 12 :
System.out.println("十二月");break;
default:
System.out.println("错误的输入");break;
}The above is the detailed content of How to use switch statement in Java and examples. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
What is a deadlock in Java and how can you prevent it?
Aug 23, 2025 pm 12:55 PM
AdeadlockinJavaoccurswhentwoormorethreadsareblockedforever,eachwaitingforaresourceheldbytheother,typicallyduetocircularwaitcausedbyinconsistentlockordering;thiscanbepreventedbybreakingoneofthefournecessaryconditions—mutualexclusion,holdandwait,nopree
![You are not currently using a display attached to an NVIDIA GPU [Fixed]](https://img.php.cn/upload/article/001/431/639/175553352135306.jpg?x-oss-process=image/resize,m_fill,h_207,w_330)
You are not currently using a display attached to an NVIDIA GPU [Fixed]
Aug 19, 2025 am 12:12 AM
Ifyousee"YouarenotusingadisplayattachedtoanNVIDIAGPU,"ensureyourmonitorisconnectedtotheNVIDIAGPUport,configuredisplaysettingsinNVIDIAControlPanel,updatedriversusingDDUandcleaninstall,andsettheprimaryGPUtodiscreteinBIOS/UEFI.Restartaftereach
How to use Optional in Java?
Aug 22, 2025 am 10:27 AM
UseOptional.empty(),Optional.of(),andOptional.ofNullable()tocreateOptionalinstancesdependingonwhetherthevalueisabsent,non-null,orpossiblynull.2.CheckforvaluessafelyusingisPresent()orpreferablyifPresent()toavoiddirectnullchecks.3.Providedefaultswithor
Building Cloud-Native Java Applications with Micronaut
Aug 20, 2025 am 01:53 AM
Micronautisidealforbuildingcloud-nativeJavaapplicationsduetoitslowmemoryfootprint,faststartuptimes,andcompile-timedependencyinjection,makingitsuperiortotraditionalframeworkslikeSpringBootformicroservices,containers,andserverlessenvironments.1.Microna
Java Cryptography Architecture (JCA) for Secure Coding
Aug 23, 2025 pm 01:20 PM
Understand JCA core components such as MessageDigest, Cipher, KeyGenerator, SecureRandom, Signature, KeyStore, etc., which implement algorithms through the provider mechanism; 2. Use strong algorithms and parameters such as SHA-256/SHA-512, AES (256-bit key, GCM mode), RSA (2048-bit or above) and SecureRandom; 3. Avoid hard-coded keys, use KeyStore to manage keys, and generate keys through securely derived passwords such as PBKDF2; 4. Disable ECB mode, adopt authentication encryption modes such as GCM, use unique random IVs for each encryption, and clear sensitive ones in time
Java Persistence with Spring Data JPA and Hibernate
Aug 22, 2025 am 07:52 AM
The core of SpringDataJPA and Hibernate working together is: 1. JPA is the specification and Hibernate is the implementation, SpringDataJPA encapsulation simplifies DAO development; 2. Entity classes map database structures through @Entity, @Id, @Column, etc.; 3. Repository interface inherits JpaRepository to automatically implement CRUD and named query methods; 4. Complex queries use @Query annotation to support JPQL or native SQL; 5. In SpringBoot, integration is completed by adding starter dependencies and configuring data sources and JPA attributes; 6. Transactions are made by @Transactiona
Fixed: Windows Is Showing 'A required privilege is not held by the client'
Aug 20, 2025 pm 12:02 PM
RuntheapplicationorcommandasAdministratorbyright-clickingandselecting"Runasadministrator"toensureelevatedprivilegesaregranted.2.CheckUserAccountControl(UAC)settingsbysearchingforUACintheStartmenuandsettingtheslidertothedefaultlevel(secondfr
How to use the Pattern and Matcher classes in Java?
Aug 22, 2025 am 09:57 AM
The Pattern class is used to compile regular expressions, and the Matcher class is used to perform matching operations on strings. The combination of the two can realize text search, matching and replacement; first create a pattern object through Pattern.compile(), and then call its matcher() method to generate a Matcher instance. Then use matches() to judge the full string matching, find() to find subsequences, replaceAll() or replaceFirst() for replacement. If the regular contains a capture group, the nth group content can be obtained through group(n). In actual applications, you should avoid repeated compilation patterns, pay attention to special character escapes, and use the matching pattern flag as needed, and ultimately achieve efficient
