Top Tweets for #ctrlpluscode
You are given the head of a linked list. Delete the middle node, and return the head of the modified linked list.
The middle node of a linked list of size n is the ⌊n / 2⌋th node from the start using 0-based indexing.
#CtrlPlusCode #Java #LeetCode
Spring Security in 30 lines — form login + basic auth + role-based access, explained. ☕☕
#CtrlPlusCode #Java #SpringBoot
❤️🔥Aspect-Oriented Programming (Spring AOP) 🍀🍀
Spring AOP allows you to intercept method calls and execute custom logic before, after, or around the actual method, without touching the method's code.
#CtrlPlusCode #Spring #Java
❤️🔥Want to master JPA/Hibernate basics?
Let's break down the Core Annotations every Spring Boot developer must know
@Entity, @Table, @Id, @GeneratedValue, @Column, @Enumerated
#CtrlPlusCode #Java #SpringBoot #Hibernate
🛑Stop hardcoding API keys & configurations in your Java classes! It’s a recipe for security risks and deployment headaches.
Instead, use Spring Boot's @Value annotation to pull data dynamically from https://t.co/T1zyYge1jW.
#CtrlPlusCode #Java #Spring
Stop mixing up Spring Bean Scopes ☕️
• Singleton (Default): Like a shared Google Doc. One instance reused everywhere. Best for stateless services.
• Prototype: Like a downloaded Word doc. A fresh instance created every single time. Best for stateful data.
#CtrlPlusCode #Java
Looping through a Java list twice to get two different results?
Use Collectors.teeing() (Java 12+). It acts like a T-pipe for streams: splits one dataset into two separate calculations (like Min & Max), then merges them at the end.
One pass. Clean code. ☕️
#CtrlPlusCode #Java
Still writing 50 lines of Java boilerplate just to hold data?
Java Records fix this in one line
Behind the scenes, you instantly get: • Constructor • Getters • toString() • equals & hashCode
Immutable & clean.
#CtrlPlusCode #Java #Coding
Java trick seniors love ☕️💛
try-with-resources isn't just for files. Use it to auto-reset any state.
Implement AutoCloseable, put cleanup in close(), and let Java handle the rest. It's guaranteed to run even if your code crashes. Bye, messy finally blocks!
#CtrlPlusCode #Java
String Compression 💛
The Goal: Implement a method to perform basic string compression using the counts of repeated characters.
For example, the string aabcccccaaa would become a2b1c5a3.
Time Complexity: O(n + k)
#CtrlPlusCode #Java
Most used Design Patterns in Java:
Singleton → one instance (watch out in multithreading)
Factory → delegate object creation
Builder → clean object construction
Observer → event-driven logic
Strategy → swap algorithms at runtime
Spring uses all 5 internally.
#CtrlPlusCode
Spring AOP lets you inject logic (logging, security,
transactions) into methods WITHOUT touching the actual
code.💛
It wraps your bean in a proxy and intercepts calls.
#CtrlPlusCode #Spring
🧵 Thread on how it works 👇
@Bean vs @Component in Spring.❤️🔥
@Component — You own the class, just annotate it and Spring auto-detects it via classpath scanning.
@Bean — You don't own the class, so you manually instantiate and register it inside a @Configuration class.
#CtrlPlusCode #Java #Coding
Optional Class:
In Java 8, the Optional<T> class was introduced in java.util to help avoid NullPointerException and make code more readable when dealing with values that may or may not be present💛
#CtrlPlusCode #Java #Coding
❤️🔥Stream vs Parallel Stream in Java:
->Sequential Stream A sequential stream processes elements one at a time on a single thread.
->Parallel Stream A parallel stream splits the data into multiple sub-streams and processes them concurrently across multiple CPU cores.
#CtrlPlusCode
Setter Injection in SPRING.
When to use:
-> Dependency is truly optional (required = false)
-> Circular dependency workaround (rare)
-> Reconfiguring bean after initialization
#CtrlPlusCode #Java #Spring
Three Types of Autowiring in Spring:
1. Field Injection ❌ (Not Recommended)
2. Constructor Injection ✅ (Recommended)
3. Setter Injection ⚠️ (Use Only for Optional Dependencies)
#CtrlPlusCode #Java #Coding
Constructors Injection in SPRING.
Why it's best:
-> Fields can be final — immutable, thread-safe
-> Easy to unit test — just new OrderService(mockPayment, mockNotif)
-> Dependencies are explicit and visible
#CtrlPlusCode #Java #Spring
Three Types of Autowiring in Spring:
1. Field Injection ❌ (Not Recommended)
2. Constructor Injection ✅ (Recommended)
3. Setter Injection ⚠️ (Use Only for Optional Dependencies)
#CtrlPlusCode #Java #Coding
Here is the Example for Field Injection. 💛
Problems:
-> Can't make field final — no immutability
-> Hard to unit test — can't inject mock via constructor
-> Hides dependencies — not clear from outside what class needs
#CtrlPlusCode #Java
Three Types of Autowiring in Spring:
1. Field Injection ❌ (Not Recommended)
2. Constructor Injection ✅ (Recommended)
3. Setter Injection ⚠️ (Use Only for Optional Dependencies)
#CtrlPlusCode #Java #Coding
どっちが大きいでしょうか？
Three Types of Autowiring in Spring:
1. Field Injection ❌ (Not Recommended)
2. Constructor Injection ✅ (Recommended)
3. Setter Injection ⚠️ (Use Only for Optional Dependencies)
#CtrlPlusCode #Java #Coding
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