1. Local-Variable Syntax for Lambda Parameters (JEP 323)
Feature Overview:
Java 11 allows var to be used in lambda expressions to declare parameters, enhancing readability.
Example:
// Prior to Java 11
BiFunction<Integer, Integer, Integer> adder = (Integer a, Integer b) -> a + b;
// Java 11
BiFunction<Integer, Integer, Integer> adder = (var a, var b) -> a + b;
Interview Question:
Q: How does Java 11 improve lambda expressions with respect to local variable declaration?
Answer: Java 11 introduces the ability to use var in lambda expressions for declaring parameters, reducing verbosity and enhancing readability.
2. HTTP Client (JEP 321)
Feature Overview:
Java 11 provides a standardized HTTP client API to support HTTP/1.1 and HTTP/2. It is designed for modern web applications.
Example:
// Asynchronous GET request
HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create("https://jsonplaceholder.typicode.com/posts/1"))
.build();
client.sendAsync(request, HttpResponse.BodyHandlers.ofString())
.thenApply(HttpResponse::body)
.thenAccept(System.out::println)
.join();
Interview Question:
Q: What are the advantages of using the new HTTP Client API introduced in Java 11?
Answer: Java 11's HTTP Client API provides a modern and flexible way to handle HTTP requests, supporting both synchronous and asynchronous operations with features like HTTP/2 support, WebSocket support, and improved performance.
3. String Methods (JEP 321)
Feature Overview:
Java 11 introduces several new methods in the String class for common tasks, improving code readability and reducing boilerplate.
Example:
String text = " Hello, Java 11! ";
System.out.println(text.isBlank()); // true
System.out.println(text.strip()); // "Hello, Java 11!"
System.out.println(text.repeat(2)); // " Hello, Java 11! Hello, Java 11! "
Interview Question:
Q: How does Java 11 enhance string handling with the introduction of new methods like isBlank() and strip()?
Answer: Java 11 introduces isBlank() to check if a string is empty or contains only white spaces, and strip() to remove leading and trailing white spaces. These methods improve readability and simplify common string operations.
4. Local-Variable Syntax for Lambda Parameters (JEP 323)
Feature Overview:
Java 11 allows var to be used in lambda expressions to declare parameters, enhancing readability.
Example:
// Prior to Java 11
BiFunction<Integer, Integer, Integer> adder = (Integer a, Integer b) -> a + b;
// Java 11
BiFunction<Integer, Integer, Integer> adder = (var a, var b) -> a + b;
Interview Question:
Q: How does Java 11 improve lambda expressions with respect to local variable declaration?
Answer: Java 11 introduces the ability to use var in lambda expressions for declaring parameters, reducing verbosity and enhancing readability.
5. HTTP Client (JEP 321)
Feature Overview:
Java 11 provides a standardized HTTP client API to support HTTP/1.1 and HTTP/2. It is designed for modern web applications.
Example:
// Asynchronous GET request
HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create("https://jsonplaceholder.typicode.com/posts/1"))
.build();
client.sendAsync(request, HttpResponse.BodyHandlers.ofString())
.thenApply(HttpResponse::body)
.thenAccept(System.out::println)
.join();
Interview Question:
Q: What are the advantages of using the new HTTP Client API introduced in Java 11?
Answer: Java 11's HTTP Client API provides a modern and flexible way to handle HTTP requests, supporting both synchronous and asynchronous operations with features like HTTP/2 support, WebSocket support, and improved performance.
6. String Methods (JEP 321)
Feature Overview:
Java 11 introduces several new methods in the String class for common tasks, improving code readability and reducing boilerplate.
Example:
java
String text = " Hello, Java 11! ";
System.out.println(text.isBlank()); // true
System.out.println(text.strip()); // "Hello, Java 11!"
System.out.println(text.repeat(2)); // " Hello, Java 11! Hello, Java 11! "
Interview Question:
Q: How does Java 11 enhance string handling with the introduction of new methods like isBlank() and strip()?
Answer: Java 11 introduces isBlank() to check if a string is empty or contains only white spaces, and strip() to remove leading and trailing white spaces. These methods improve readability and simplify common string operations.
7. Local-Variable Syntax for Lambda Parameters (JEP 323)
Feature Overview:
Java 11 allows var to be used in lambda expressions to declare parameters, enhancing readability.
Example:
java
// Prior to Java 11
BiFunction<Integer, Integer, Integer> adder = (Integer a, Integer b) -> a + b;
// Java 11
BiFunction<Integer, Integer, Integer> adder = (var a, var b) -> a + b;
Interview Question:
Q: How does Java 11 improve lambda expressions with respect to local variable declaration?
Answer: Java 11 introduces the ability to use var in lambda expressions for declaring parameters, reducing verbosity and enhancing readability.
8. HTTP Client (JEP 321)
Feature Overview:
Java 11 provides a standardized HTTP client API to support HTTP/1.1 and HTTP/2. It is designed for modern web applications.
Example:
java
// Asynchronous GET request
HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create("https://jsonplaceholder.typicode.com/posts/1"))
.build();
client.sendAsync(request, HttpResponse.BodyHandlers.ofString())
.thenApply(HttpResponse::body)
.thenAccept(System.out::println)
.join();
Interview Question:
Q: What are the advantages of using the new HTTP Client API introduced in Java 11?
Answer: Java 11's HTTP Client API provides a modern and flexible way to handle HTTP requests, supporting both synchronous and asynchronous operations with features like HTTP/2 support, WebSocket support, and improved performance.
9. String Methods (JEP 321)
Feature Overview:
Java 11 introduces several new methods in the String class for common tasks, improving code readability and reducing boilerplate.
Example:
java
String text = " Hello, Java 11! ";
System.out.println(text.isBlank()); // true
System.out.println(text.strip()); // "Hello, Java 11!"
System.out.println(text.repeat(2)); // " Hello, Java 11! Hello, Java 11! "
Interview Question:
Q: How does Java 11 enhance string handling with the introduction of new methods like isBlank() and strip()?
Answer: Java 11 introduces isBlank() to check if a string is empty or contains only white spaces, and strip() to remove leading and trailing white spaces. These methods improve readability and simplify common string operations.