集合类的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()方法用于在运行时返回给定集合的类型安全视图。

• 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()方法是一个静态方法，因此可以使用类名进行访问，如果我们尝试使用类对象访问该方法，则不会收到错误。

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

  返回Collection时， checkedCollection()方法不会引发异常。

Syntax:

句法：

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

Parameter(s):

参数：

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

  集合co –表示在运行时为其获取类型安全视图的集合。

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

  ele_ty类 –表示允许给定集合存储的元素类型。

Return value:

返回值：

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

方法的返回类型为Collection ，它动态返回给定集合的typesafe视图。

Example:

例：

// Java Program is to demonstrate the example
// of Collection checkedCollection(Collection co, Class ele_ty) of
// Collections class
import 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 list
link_list.add(20);
link_list.add(10);
link_list.add(30);
link_list.add(40);
link_list.add(50);
// Display LinkedList
System.out.println("link_list: " + link_list);
// By using checkedCollection() method is to
// represent the type safe view of the given Collection
Collection < Integer > co = Collections.checkedCollection(link_list, Integer.class);
System.out.println();
System.out.println("Collections.checkedCollection(link_list, Integer.class) :");
// Display collection
System.out.println("co: " + co);
}
}

Output

输出量

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

翻译自: https://www.includehelp.com/java/collections-checkedcollection-method-with-example.aspx