myAL is not synchronized. mySyncdAL is synchronized. */ 備註 若要保證的 ArrayList線程安全性,所有作業都必須透過這個包裝函式來完成。 透過集合進行列舉在本質上並非安全執行緒程序。 即使集合經過同步化,其他的執行緒仍可修改該集合,使列舉值擲回例外狀況。 若要保證列舉過程的執行緒安全,您可以在整個列舉...
获取元素的第一次出现的index: /*** Returns the index of the first occurrence of the specified element* in this list, or -1 if this list does not contain the element.* More formally, returns the lowest index i such that* (o==null ? get(i)==null : o.equals(get(i))),* or -1 ...
Synchronization:Vector issynchronized, which means only one thread at a time can access the code, while ArrayList isnot synchronized, which means multiple threads can work on ArrayList at the same time. For example, if one thread is performing an add operation, then there can be another thread...
Non-synchronized –ArrayList is not synchronized by default. The programmer needs to use the synchronized keyword appropriately or simply use the Vector class. Allows duplicate items –We can add duplicate elements in ArrayList. It is not possible in sets. The java.util.ArrayList class extends Abst...
ArrayList.Synchronized( myAL );// Displays the sychronization status of both ArrayLists.Console.WriteLine("myAL is {0}.", myAL.IsSynchronized ?"synchronized":"not synchronized"); Console.WriteLine("mySyncdAL is {0}.", mySyncdAL.IsSynchronized ?"synchronized":"not synchronized"); } }/*...
Note that this implementation is not synchronized.If multiple threads access anArrayListinstance concurrently, and at least one of the threads modifies the list structurally, itmustbe synchronized externally. (A structural modification is any operation that adds or deletes one or more elements, or ex...
ArrayListArrayList概述成员变量构造器成员方法Summary概述ArrayList是List接口的具体实现类,可以存储任何元素,包括null。这个类与Vector类几乎是一样的,仅有的区别就是Vector类是线程安全的(方法有synchronized关键字),而Ar...
To guarantee the thread safety of the ArrayList, all operations must be done through the wrapper returned by the Synchronized(IList) method.Enumerating through a collection is intrinsically not a thread-safe procedure. Even when a collection is synchronized, other threads can still modify the ...
Note that this implementation is not synchronized. If multiple threads access an ArrayList instance concurrently, and at least one of the threads modifies the list structurally, it must be synchronized externally. (A structural modification is any operation that adds or deletes one or more elements...
*Note thatthisimplementation is not synchronized.*If multiple threads access anArrayListinstance concurrently,*and at least oneofthe threads modifies the list structurally,it*mustbe synchronized externally.(Astructural modification is*any operation that adds or deletes one or more elements,or explicitly*...