print elements of arraylist java

ReviewThe Java collection is divided into two architectures, collection and maps. This blog mainly introduces the three commonly used implementation classes under the collection sub-interface list: ArrayList, vectors, and LinkedList.See "Java Basics-Collections" For more informationFirst look at the diagram:1, ArrayListThis is the most common implementation class

reassign the object[] array.1) void ensurecapacity (int mincapacity): ArrayList or vector set of object[] ArrayIncrease mincapacity.2) void TrimToSize (): Adjusts the object[] array length of the ArrayList or vector set to the current elementNumber. The program guest calls this method to reduce the storage space occupied by the ArrayList or Vector collection obj

Java container Class Analysis: Collection, List, ArrayList,1. Iterable and Iterator Iterable is an interface that enables the collection object to traverse its own elements through the iterator. Public interface Iterable Modifier and Return Value Method Name Description Iterator Iterator() Returns an iterator whose internal

are using data with a larger amount of data in a collection, vector has some advantages. If you look for data at a given location, the vectors and ArrayList use the same time, which is 0 (1), which can be used with both vectors and ArrayList. andIf moving data at a specified location takes 0 (n-i) n for the total length, this should take into account the use of LinkedList, as it moves the data at a speci

Java record-46-ArrayList source code analysisCollections are often used in programming, and ArrayList is the most commonly used in collections. The object is still referenced in the collection, not the object itself. It is the same as the array. When we learned arrays and learned collections, we found the collection was amazing. The size of the array needs to be

Java Dynamic Array ArrayList1. Class Structure: · Java. lang. Object · Java. util. AbstractCollection · Java. util. AbstractList · Java. util. ArrayList ·All Implemented Interfaces: Serializable, Cloneable, Iterable , C

from Destpos to Destpos+length-1. Because it is a native method, it is not visible in the JDK, but you can view the source code in the OPENJDK. The function actually eventually calls the C language's memmove () function, so it can guarantee the correct copying and movement of elements within the same array, which is much more efficient than the general method of replication, and is well suited for batch processing of arrays .

The Java list interface has 3 implementation classes, ArrayList, LinkedList, and vectors, which are used to store multiple elements, maintain the order of elements, and allow elements to be duplicated.The differences between the 3 specific implementation classes are as follo

in the linked list. protected void removeRange(int start, int end)Deletes an element in a linked list that ends at a location from one location to another. Get the elements in a linked list E get(int index)Gets the element at the specified position in the linked list. Object[] toArray()Gets an array in which all elements in the array are

1 Packagecom.jdk7.chapter4;2 3 Importjava.util.ArrayList;4 Importjava.util.LinkedList;5 Importjava.util.List;6 ImportJava.util.ListIterator;7 ImportJava.util.Stack;8 ImportJava.util.Vector;9 /**Ten * List of forms of collections in Java (sequential allow repetition) One * List of three forms of expression ArrayList, Vector, LinkedList A * where stack extends Vector - * Another: The list of Listiterator can

powerful cyclic structure introduced by the Java SE5.0 and for (Integer j : list) should be read for each int in list . for (Integer j : list)Implementation is almost equivalent to Iterator The foreach code is simple to write, does not have to care about subscript initial value and termination value and bounds, so it is not easy to make mistakes 2, ArrayList traversal mode results analysis

Today in the study of observer mode, look at the next observable class, found that its implementation using vector, this class is not familiar with, usually not used, to see the source of this class, the bottom of the vector is also used to implement the array, and inherit the Abstractlist, The implementation of the list interface, looking at the vector and ArrayList very much like: the bottom is the implementation of the array, all inherit the abstra

The main is to review the previously learned knowledge, may also be able to help the new learning Java-^ So I've opened my own blog, too. Seriously, Java list on the web blog is also a lot, but I recently read a "data structure and algorithmic analysis of the Java language description", which is the list implementation class explanation is not bad, but also let

ArrayList OverviewArrayList is the most common implementation class of the list interface, the underlying is implemented by the array, can be stored in null values, each ArrayList has a capacity (capacity) attribute, the initial value is 10, representing the storage space of the underlying array, ArrayList automatically completes capacity amplification when the n

, where only one thread can write vectors at a time, avoiding inconsistencies caused by simultaneous writing of multiple threads, but achieving synchronization requires a high cost, so Accessing it is slower than accessing ArrayList. LinkedList is used to store data in a linked list structure, which is very suitable for the dynamic insertion and deletion of data, and the random access and traversal speed is relatively slow. In addition, he provide

, where only one thread can write vectors at a time, avoiding inconsistencies caused by simultaneous writing of multiple threads, but achieving synchronization requires a high cost, so Accessing it is slower than accessing ArrayList. LinkedList is used to store data in a linked list structure, which is very suitable for the dynamic insertion and deletion of data, and the random access and traversal speed is relatively slow. In addition, he provide

Java Vector and ArrayList comparisons Today we studied vector and ArrayList source code, and deepened the understanding of these two classes. A total of three classes are implemented under the list interface: Arraylist,vector,linkedlist. LinkedList is not much to say, it is generally used to keep the data in the inse

An overall understanding of ArrayListArrayList is an array queue, which is equivalent to a dynamic array. Its capacity can grow dynamically compared to the array in Java. It inherits the Abstractlist and implements the list,randomaccess,cloneable,java.io.serializable of these interfaces.ArrayList inherits the Abstractlist and implements the list. It is an array queue that provides related additions, deletions, modifications, and traversal functions.Ar

Java basics-ArrayList and listparts list (1), arraylistparts list I. Definition ArrayList and referlist are two collection classes used to store a series of object references ). The referenced formats are: 1 ArrayList 1 items list Ii. Differences between ArrayList and rule