---
title: "3 Advanced Java Best Practices"
source: "https://orlandolorenzodeveloper.medium.com/3-advances-java-best-practices-ac7d02a55432"
author:
  - "[[Lorenzo Orlando | Kreyzon Custom Software]]"
published: 2024-10-01
created: 2024-10-29
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…"
tags:
  - "clippings"
---
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Hello everyone, today we’re diving deep in some advanced Java best practices. Let’s start right away.

## 1\. Use Streams and Lambda Expressions Efficiently

**Why?**

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.

**Best Practices:**

- Avoid creating multiple intermediate Stream operations like `filter()` and `map()` if not necessary, as they can add overhead.
- Leverage **parallel streams** for CPU-bound tasks but avoid them for I/O-bound tasks (due to context switching).
- Prefer `**forEach()**` for side effects like logging, but use terminal operations like `collect()` for transforming data.

**Example**

```
List<String> names = employees.stream()                              .filter(e -> e.getAge() > 30)                              .map(Employee::getName)                              .collect(Collectors.toList());
```

## 2\. Minimize Synchronization and Leverage Concurrency Utilities

**Why?**

Java provides a rich set of concurrency utilities like `ExecutorService`, `ForkJoinPool`, and `CompletableFuture`. Using these properly avoids blocking and bottlenecks in multi-threaded applications.

**Best Practices:**

- Use `**ConcurrentHashMap**` over synchronized collections for thread-safe operations with better performance.
- Utilize **optimistic locking** (e.g., `java.util.concurrent.atomic` package) instead of traditional `synchronized` blocks.
- Leverage **non-blocking algorithms** and modern concurrency utilities like `CompletableFuture` for asynchronous processing.

**Example**

```
CompletableFuture<Void> future = CompletableFuture.runAsync(() -> {    processData();}, executorService);
```

## 3\. Apply Design Patterns and Immutability Smartly

**Why?**

Design patterns like **Singleton**, **Factory**, and **Builder** ensure better object management, while immutability improves thread-safety and reduces side effects.

**Best Practices:**

- Ensure **immutability** in frequently used objects to make them thread-safe without requiring synchronization.
- Use **Factory Pattern** to encapsulate object creation, making the code more flexible and testable.
- Apply the **Builder Pattern** for constructing complex objects, making the code cleaner and avoiding telescoping constructors.

**Example**

```
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();
```