From 13ef94936cbc77e475cfe36bb777d19aac8f2e7c Mon Sep 17 00:00:00 2001 From: Lukas Kulas Date: Tue, 5 Aug 2025 16:41:08 +0800 Subject: [PATCH 1/3] Created offer entry for java queue interface --- .../java/concepts/queue/terms/offer/offer.md | 47 +++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 content/java/concepts/queue/terms/offer/offer.md diff --git a/content/java/concepts/queue/terms/offer/offer.md b/content/java/concepts/queue/terms/offer/offer.md new file mode 100644 index 00000000000..5a3a699de08 --- /dev/null +++ b/content/java/concepts/queue/terms/offer/offer.md @@ -0,0 +1,47 @@ +The **`.offer()`** method is a key operation in the Java `Queue` interface, allowing you to add elements to the queue. It is designed to insert an element at the end of the queue and returns `true` upon success. + +If the queue has a capacity limit and is full, it will return `false` instead of throwing an exception, making it a safer option compared to the `add()` method. + +This method is particularly useful in scenarios where you want to avoid exceptions and handle full queues gracefully. + +## Syntax + +```java +Queue queue = new LinkedList<>(); +boolean result = queue.offer(element); +``` +### Parameters +- `element`: The element to be added to the queue. + +### Return Value +- Returns `true` if the element was added successfully, `false` if the queue is full. + +## Example: Using `offer()` in a Print Job Queue System + +```java +import java.util.LinkedList; +import java.util.Queue; + +public class PrintJobQueue { + public static void main(String[] args) { + Queue printQueue = new LinkedList<>(); + + // Simulate adding print jobs to the queue + boolean added = printQueue.offer("Document1"); + System.out.println("Added Document1: " + added); + + added = printQueue.offer("Document2"); + System.out.println("Added Document2: " + added); + + // Simulate a full queue scenario + while (!printQueue.isEmpty()) { + String job = printQueue.poll(); + System.out.println("Processing " + job); + } + + // Attempt to add another job to a full queue + added = printQueue.offer("Document3"); + System.out.println("Added Document3: " + added); + } +} +``` \ No newline at end of file From 5088b54b54168f7ac390961dddfbefbaab15bcbb Mon Sep 17 00:00:00 2001 From: arisdelacruz <115809819+arisdelacruz@users.noreply.github.com> Date: Tue, 5 Aug 2025 16:54:06 +0800 Subject: [PATCH 2/3] Update offer.md --- .../java/concepts/queue/terms/offer/offer.md | 39 ++++++++++++++++++- 1 file changed, 37 insertions(+), 2 deletions(-) diff --git a/content/java/concepts/queue/terms/offer/offer.md b/content/java/concepts/queue/terms/offer/offer.md index 5a3a699de08..f4bfb4aba56 100644 --- a/content/java/concepts/queue/terms/offer/offer.md +++ b/content/java/concepts/queue/terms/offer/offer.md @@ -1,4 +1,17 @@ -The **`.offer()`** method is a key operation in the Java `Queue` interface, allowing you to add elements to the queue. It is designed to insert an element at the end of the queue and returns `true` upon success. +--- +Title: 'Offer' +Description: 'The offer() method in Java Queue interface allows adding elements to the queue without throwing exceptions.' +Subjects: + - 'Code Foundations' + - 'Computer Science' +Tags: + - 'Queue' +CatalogContent: + - 'learn-java' + - 'paths/computer-science' +--- + +The **`.offer()`** method is a key operation in the Java `Queue` interface, allowing you to add elements to the queue. It is designed to insert an element at the end of the queue and returns `true` upon success. If the queue has a capacity limit and is full, it will return `false` instead of throwing an exception, making it a safer option compared to the `add()` method. @@ -10,10 +23,22 @@ This method is particularly useful in scenarios where you want to avoid exceptio Queue queue = new LinkedList<>(); boolean result = queue.offer(element); ``` + ### Parameters + +- `queue`: The queue to which the element will be added. +- `Type`: The type of elements stored in the queue. - `element`: The element to be added to the queue. +- `result`: A boolean indicating whether the element was successfully added. + +## Key Points + +- **Non-blocking**: The `offer()` method does not block the thread if the queue is full; it simply returns `false`. +- **No Exceptions**: Unlike the `add()` method, which throws an `IllegalStateException` if the queue is full, `offer()` handles this situation gracefully by returning `false`. +- **Use Cases**: Ideal for scenarios where you want to add elements to a queue without worrying about exceptions, such as in producer-consumer scenarios or when implementing a print job queue. ### Return Value + - Returns `true` if the element was added successfully, `false` if the queue is full. ## Example: Using `offer()` in a Print Job Queue System @@ -44,4 +69,14 @@ public class PrintJobQueue { System.out.println("Added Document3: " + added); } } -``` \ No newline at end of file +``` + +Output: + +```shell +Added Document1: true +Added Document2: true +Processing Document1 +Processing Document2 +Added Document3: false +``` From b1f9b9751fd14e45d0995a83d1c751e379e66bb0 Mon Sep 17 00:00:00 2001 From: Mamta Wardhani Date: Mon, 11 Aug 2025 13:10:15 +0530 Subject: [PATCH 3/3] content fixes --- .../java/concepts/queue/terms/offer/offer.md | 76 ++++++++----------- 1 file changed, 30 insertions(+), 46 deletions(-) diff --git a/content/java/concepts/queue/terms/offer/offer.md b/content/java/concepts/queue/terms/offer/offer.md index f4bfb4aba56..24327905959 100644 --- a/content/java/concepts/queue/terms/offer/offer.md +++ b/content/java/concepts/queue/terms/offer/offer.md @@ -1,82 +1,66 @@ --- -Title: 'Offer' -Description: 'The offer() method in Java Queue interface allows adding elements to the queue without throwing exceptions.' +Title: 'offer()' +Description: 'Inserts the specified element into the queue if possible without violating capacity limits.' Subjects: - 'Code Foundations' - 'Computer Science' Tags: - - 'Queue' + - 'Elements' + - 'Queues' CatalogContent: - 'learn-java' - 'paths/computer-science' --- -The **`.offer()`** method is a key operation in the Java `Queue` interface, allowing you to add elements to the queue. It is designed to insert an element at the end of the queue and returns `true` upon success. +The **`.offer()`** method is part of the Java `Queue` interface and inserts an element at the end of the queue. It returns `true` if the element was added successfully, or `false` if the queue is at capacity and cannot accept new elements. -If the queue has a capacity limit and is full, it will return `false` instead of throwing an exception, making it a safer option compared to the `add()` method. - -This method is particularly useful in scenarios where you want to avoid exceptions and handle full queues gracefully. +Unlike the `add()` method, which throws an exception when the queue is full, `offer()` fails gracefully, making it useful when there is a need to handle capacity limits without triggering exceptions. ## Syntax -```java -Queue queue = new LinkedList<>(); -boolean result = queue.offer(element); +```pseudo +queue.offer(element) ``` -### Parameters - -- `queue`: The queue to which the element will be added. -- `Type`: The type of elements stored in the queue. -- `element`: The element to be added to the queue. -- `result`: A boolean indicating whether the element was successfully added. +**Parameters:** -## Key Points +- `element`: The element to be inserted to the queue. -- **Non-blocking**: The `offer()` method does not block the thread if the queue is full; it simply returns `false`. -- **No Exceptions**: Unlike the `add()` method, which throws an `IllegalStateException` if the queue is full, `offer()` handles this situation gracefully by returning `false`. -- **Use Cases**: Ideal for scenarios where you want to add elements to a queue without worrying about exceptions, such as in producer-consumer scenarios or when implementing a print job queue. - -### Return Value +**Return value:** - Returns `true` if the element was added successfully, `false` if the queue is full. +The `offer()` method is non-blocking, meaning it returns immediately if the queue is full. Instead of throwing an exception when capacity is reached, it returns `false`, making it safer for capacity-aware operations. Its behavior may vary between bounded and unbounded queue implementations. + ## Example: Using `offer()` in a Print Job Queue System +In this example, a bounded queue with capacity two demonstrates how `offer()` returns `true` when adding elements within capacity and `false` when the queue is full: + ```java -import java.util.LinkedList; import java.util.Queue; +import java.util.concurrent.ArrayBlockingQueue; public class PrintJobQueue { - public static void main(String[] args) { - Queue printQueue = new LinkedList<>(); - - // Simulate adding print jobs to the queue - boolean added = printQueue.offer("Document1"); - System.out.println("Added Document1: " + added); - - added = printQueue.offer("Document2"); - System.out.println("Added Document2: " + added); - - // Simulate a full queue scenario - while (!printQueue.isEmpty()) { - String job = printQueue.poll(); - System.out.println("Processing " + job); - } - - // Attempt to add another job to a full queue - added = printQueue.offer("Document3"); - System.out.println("Added Document3: " + added); - } + public static void main(String[] args) { + Queue printQueue = new ArrayBlockingQueue<>(2); // capacity of 2 + + boolean added = printQueue.offer("Document1"); + System.out.println("Added Document1: " + added); + + added = printQueue.offer("Document2"); + System.out.println("Added Document2: " + added); + + // Attempt to add another job to a full queue + added = printQueue.offer("Document3"); + System.out.println("Added Document3: " + added); + } } ``` -Output: +The output generated by this code is: ```shell Added Document1: true Added Document2: true -Processing Document1 -Processing Document2 Added Document3: false ```