集合類的checkedCollection()方法 (Collections Class checkedCollection() method)

• checkedCollection() Method is available in java.lang package.

  DrawnCollection()方法在java.lang包中可用。

• checkedCollection() Method is used to return the typesafe view of the given collection at runtime.

  checkedCollection()方法用于在運(yùn)行時(shí)返回給定集合的類型安全視圖。

• checkedCollection() Method is a static method, so it is accessible with the class name and if we try to access the method with the class object then we will not get an error.

  checkedCollection()方法是一個(gè)靜態(tài)方法，因此可以使用類名進(jìn)行訪問，如果我們嘗試使用類對(duì)象訪問該方法，則不會(huì)收到錯(cuò)誤。

• checkedCollection() Method does not throw an exception at the time of returning Collection.

  返回Collection時(shí)， checkedCollection()方法不會(huì)引發(fā)異常。

Syntax:

句法：

public static Collection checkedCollection(Collection co, Class ele_ty);

Parameter(s):

參數(shù)：

• Collection co – represent the collection for which to get a typesafe view at runtime.

  集合co –表示在運(yùn)行時(shí)為其獲取類型安全視圖的集合。

• Class ele_ty – represent the element type that given collection is allowed to store.

  ele_ty類 –表示允許給定集合存儲(chǔ)的元素類型。

Return value:

返回值：

The return type of the method is Collection, it returns typesafe view of the given collection dynamically.

方法的返回類型為Collection ，它動(dòng)態(tài)返回給定集合的typesafe視圖。

Example:

例：

// Java Program is to demonstrate the example // of Collection checkedCollection(Collection co, Class ele_ty) of // Collections classimport java.util.*;public class CheckedCollection {public static void main(String args[]) {// Create a linked list object LinkedList < Integer > link_list = new LinkedList < Integer > ();// By using add() method is to add the// given elements in linked listlink_list.add(20);link_list.add(10);link_list.add(30);link_list.add(40);link_list.add(50);// Display LinkedListSystem.out.println("link_list: " + link_list);// By using checkedCollection() method is to // represent the type safe view of the given CollectionCollection < Integer > co = Collections.checkedCollection(link_list, Integer.class);System.out.println();System.out.println("Collections.checkedCollection(link_list, Integer.class) :");// Display collectionSystem.out.println("co: " + co);} }

Output

輸出量

link_list: [20, 10, 30, 40, 50]Collections.checkedCollection(link_list, Integer.class) : co: [20, 10, 30, 40, 50]

翻譯自: https://www.includehelp.com/java/collections-checkedcollection-method-with-example.aspx

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