weakhashmap

WeakHashMap类values()方法 (WeakHashMap Class values() method)

• values() method is available in java.util package.

  values()方法在java.util包中可用。

• values() method is used to get the values that exist in this map to be viewed in a collection.

  values()方法用于获取此映射中存在的值以在集合中进行查看。

• values() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  values()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• values() method does not throw an exception at the time of viewing the object in a collection.

  在查看集合中的对象时， values()方法不会引发异常。

Syntax:

句法：

public Collection values();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

The return type of the method is Collection, it gets collection view of the values exists in this map.

方法的返回类型为Collection ，它获取此映射中存在的值的集合视图。

Example:

例：

// Java program to demonstrate the example // of Collection values() method of WeakHashMap import java.util.*;public class ValuesOfWeakHashMap {
       public static void main(String[] args) {
           // Instantiates a WeakHashMap object        Map < Integer, String > map = new WeakHashMap < Integer, String > ();        // By using put() method is to add        // key-value pairs in a WeakHashMap        map.put(10, "C");        map.put(20, "C++");        map.put(50, "JAVA");        map.put(40, "PHP");        map.put(30, "SFDC");        // Display WeakHashMap        System.out.println("WeakHashMap: " + map);        // By using values() method is to return        // the values exists in this WeakHashMap        // to be viewed in a collection        Collection co = map.values();        // Display collection        System.out.print("map.values(): " + co);    }}

Output

输出量

WeakHashMap: {30=SFDC, 40=PHP, 10=C, 20=C++, 50=JAVA}map.values(): [SFDC, PHP, C, C++, JAVA]

翻译自:

weakhashmap