java 方法 示例

集合类checkedList()方法 (Collections Class checkedList() method)

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

  CheckedList()方法在java.lang包中可用。

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

  checkedList()方法用于在运行时返回给定List的类型安全视图。

• checkedList() 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.

  CheckedList()方法是静态方法，因此可以使用类名进行访问，如果尝试使用类对象访问该方法，则不会收到错误。

• checkedList() Method does not throw an exception at the time of returning validated List.

  CheckedList()方法在返回经过验证的List时不会引发异常。

Syntax:

句法：

public static List checkedList(List l, Class ele_ty);

Parameter(s):

参数：

• List l – represents the list for which to get typesafe view at runtime.

  列表l –表示在运行时获取类型安全视图的列表。

• Class ele_ty – represents the element type (ele_ty) that the given List is allowed to store.

  ele_ty类 –表示允许存储给定List的元素类型(ele_ty)。

Return value:

返回值：

The return type of the method is List, it returns typesafe or validated view of the given List dynamically.

方法的返回类型为List ，它动态返回给定List的类型安全或经过验证的视图。

Example:

例：

// Java Program is to demonstrate the example// of List checkedList(List l, Class ele_ty) of Collections classimport java.util.*;public class CheckedList {
       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 checkedList() method is to         // represent the type safe view of the given        // Collection linked list        Collection < Integer > co = Collections.checkedList(link_list, Integer.class);        System.out.println();        System.out.println("Collections.checkedList(link_list, Integer.class) :");        // Display collection        System.out.println("co: " + co);    }}

Output

输出量

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

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java 方法 示例