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May 12, 2015 · 9. Guava's Sets includes: public static <E> HashSet<E> newHashSet(E... elements) which: Creates a mutable HashSet instance containing the given elements in unspecified order. You can call it with a single item as: Sets.newHashSet(item); answered May 12, 2015 at 14:23. Joe.
- Mutable Empty Set
- Unmodifiable Empty Set
- Immutable Empty Set
⮚ Using Plain Java We can simply use the HashSet constructor, which constructs an empty resizable-array implementation of the Setinterface. The following code takes advantage of the new “diamond” syntax introduced in Java SE 7. ⮚ Using Guava Guava’s Sets.newHashSet() creates a mutable, empty HashSetinstance. This method is deprecated in Java 7 and ...
⮚ Using Collections Collections unmodifiableSet()returns an unmodifiable view of the specified set. ⮚ Using Apache Collections: SetUtilsClass Apache Commons Collections SetUtils.unmodifiableSet()returns an unmodifiable set backed by the specified set. Both the above methods throw a NullPointerException if the specified set is null. If we try to mod...
There are several ways to create an immutable empty set in Java. The set will throw an UnsupportedOperationExceptionif any modification operation is performed on it. ⮚ Using Collections We can use Collections.EMPTY_SETthat returns an immutable, serializable, and empty set. The above method might throw an unchecked assignment warning. The following ...
Mar 29, 2024 · OpenPDF is a free Java library for creating and editing PDF files, with a LGPL and MPL open source license. OpenPDF is based on a fork of iText. We welcome contributions from other developers. Please feel free to submit pull-requests and bugreports to this GitHub repository. Topics
Jan 8, 2024 · In this article, we’ll see how to edit the content of an existing PDF file in Java. First, we’ll just add new content. Then, we’ll focus on removing or replacing some pre-existing content. 2. Adding the iText7 Dependency. We’ll use the iText7 library to add content to the PDF file.
Click anywhere on the PDF page to add text. Change PDF text. Select the 'Text' tool in the top toolbar. Click any existing text to start editing. Make text bold or italic, change font size, font family and text color. Add image to PDF. Click the 'Images' menu and select 'New Image'.
Apr 8, 2024 · An unmodifiable collection is a wrapper around a mutable collection that prevents modifications through the wrapper reference. We get the unmodifiable reference by using a utility method, for example, unmodifiableMap () in the case of Java Map collection: Map<String, String> modifiableMap = new HashMap <>();
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Jul 9, 2024 · Mutable class objects provide methods to modify their content, whereas immutable class objects do not allow state modification. Mutable class objects may or may not be thread-safe, while immutable class objects are inherently thread-safe. Creating a new object is required when modifying the state of an immutable class object, while mutable ...
