74 lines
3.7 KiB
Markdown
74 lines
3.7 KiB
Markdown
---
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title: "3 Advanced Java Best Practices"
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source: "https://orlandolorenzodeveloper.medium.com/3-advances-java-best-practices-ac7d02a55432"
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author:
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- "[[Lorenzo Orlando | Kreyzon Custom Software]]"
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published: 2024-10-01
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created: 2024-10-29
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description: "Hello everyone, today we’re diving deep in some advanced Java best practices. Let’s start right away. Java 8 introduced streams and lambda expressions, which allow for cleaner, functional-style code…"
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tags:
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- "clippings"
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---
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[
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](https://orlandolorenzodeveloper.medium.com/?source=post_page---byline--ac7d02a55432--------------------------------)
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Hello everyone, today we’re diving deep in some advanced Java best practices. Let’s start right away.
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## 1\. Use Streams and Lambda Expressions Efficiently
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**Why?**
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Java 8 introduced streams and lambda expressions, which allow for cleaner, functional-style code. While they are powerful, improper use can lead to performance overhead and complexity.
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**Best Practices:**
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- Avoid creating multiple intermediate Stream operations like `filter()` and `map()` if not necessary, as they can add overhead.
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- Leverage **parallel streams** for CPU-bound tasks but avoid them for I/O-bound tasks (due to context switching).
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- Prefer `**forEach()**` for side effects like logging, but use terminal operations like `collect()` for transforming data.
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**Example**
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```
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List<String> names = employees.stream() .filter(e -> e.getAge() > 30) .map(Employee::getName) .collect(Collectors.toList());
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```
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## 2\. Minimize Synchronization and Leverage Concurrency Utilities
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**Why?**
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Java provides a rich set of concurrency utilities like `ExecutorService`, `ForkJoinPool`, and `CompletableFuture`. Using these properly avoids blocking and bottlenecks in multi-threaded applications.
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**Best Practices:**
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- Use `**ConcurrentHashMap**` over synchronized collections for thread-safe operations with better performance.
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- Utilize **optimistic locking** (e.g., `java.util.concurrent.atomic` package) instead of traditional `synchronized` blocks.
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- Leverage **non-blocking algorithms** and modern concurrency utilities like `CompletableFuture` for asynchronous processing.
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**Example**
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```
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CompletableFuture<Void> future = CompletableFuture.runAsync(() -> { processData();}, executorService);
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```
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## 3\. Apply Design Patterns and Immutability Smartly
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**Why?**
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Design patterns like **Singleton**, **Factory**, and **Builder** ensure better object management, while immutability improves thread-safety and reduces side effects.
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**Best Practices:**
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- Ensure **immutability** in frequently used objects to make them thread-safe without requiring synchronization.
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- Use **Factory Pattern** to encapsulate object creation, making the code more flexible and testable.
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- Apply the **Builder Pattern** for constructing complex objects, making the code cleaner and avoiding telescoping constructors.
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**Example**
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```
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public class User { private final String name; private final int age; private User(Builder builder) { this.name = builder.name; this.age = builder.age; } public static class Builder { private String name; private int age; public Builder withName(String name) { this.name = name; return this; } public Builder withAge(int age) { this.age = age; return this; } public User build() { return new User(this); } }}User user = new User.Builder().withName("John").withAge(25).build();
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``` |