Returns an unmodifiable view of the specified list. Query operations on the returned list "read through" to the specified list, and attempts to modify the returned list, whether direct or via its iterator, result in anUnsupportedOperationException. ...
Java documentation for java.util.Collections. Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License. Constructors 展開資料表 Collections(IntPtr, JniHandleOwners...
Reduces effort to learn and to use new APIs:Many APIs naturally take collections on input and furnish them as output. In the past, each such API had a small sub-API devoted to manipulating its collections. There was little consistency among these ad hoc collections sub-APIs, so you had to...
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allocates an array, and stores in that array an indication that its components are of typeString. In contrast, executing: new ArrayList<String>() allocates a list, but does not store in the list any indication of the type of its elements. We say that Javareifiesarray component types but...
asLifoQueue(Deque) - returns a view of a Deque as a Last-in-first-out (Lifo) Queue.The Arrays utility class now has methods copyOf and copyOfRange that can efficiently resize, truncate, or copy subarrays for arrays of all types. ...
reify翻译为具体化,计算机科学中,reification可理解为run-time类型信息的显式表示。Java中,数组具体化组成元素类型(component type),但是泛型类型不会具体化类型参数信息。 6.1 Reifiable Types 以下类型是可具体化的(reifiable): primitive type,如int 非参数化的类或者接口,如String, Runnable ...
Prior to Java version 1.5, a Java class could only be written with its attribute and parameter types in mind. One could never translate a type-independent concept into a class. With the introduction of Java Generics in Java 2 version 1.5, we can define a class without specifying the type ...
Static nested classes are usually both simpler and more efficient. How Erasure Works The erasure of a type is defined as follows: drop all type parameters from parameterized types, and replace any type variable with the erasure of its bound, or with Object if it has no bound, or with the...
Array Utilities. Utility functions for arrays of primitive types and reference objects. Not, strictly speaking, a part of the collections framework, this feature was added to the Java platform at the same time as the collections framework and relies on some of the same infrastructure. ...