java enummap

EnumMap类remove()方法 (EnumMap Class remove() method)

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

  remove()方法在java.util包中可用。

• remove() method is used to clear all mappings associated with the given key element (key_ele) when it exists.

  remove()方法用于清除与给定键元素(key_ele)相关联的所有映射。

• remove() 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.

  remove()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。

• remove() method does not throw an exception at the time of returning an associated value with the given key element (key_ele).

  在返回与给定键元素(key_ele)关联的值时， remove()方法不会引发异常。

Syntax:

句法：

public Value remove(Object key_ele);

Parameter(s):

参数：

• Object key_ele – represents the key element (key _ele) whose associated values is to be removed from this enum map.

  对象key_ele –表示要从此枚举映射中删除其关联值的键元素(键_ele)。

Return value:

返回值：

The return type of this method is Value, it returns the removed value mapped with the given key element (key_ele) when exists otherwise it returns null.

此方法的返回类型为Value ，如果存在则返回与给定键元素(key_ele)映射的移除值，否则返回null。

Example:

例：

// Java program to demonstrate the example // of Value remove(Object key_ele)  method of EnumMapimport java.util.*;public class RemoveOfEnumMap {
       public enum Colors {
           RED,        BLUE,        PINK,        YELLOW    };    public static void main(String[] args) {
           // We are creating EnumMap object        EnumMap < Colors, String > em =            new EnumMap < Colors, String > (Colors.class);        // By using put() method is to        // add the linked values in an        // EnumMap (em)        em.put(Colors.RED, "1");        em.put(Colors.BLUE, "2");        em.put(Colors.PINK, "3");        em.put(Colors.YELLOW, "4");        // Display EnumMap        System.out.println("EnumMap (em) :" + em);        // By using remove(key_ele) method isto        // remove the key-value for the given key        // element (key_ele) when exists        em.remove(Colors.YELLOW);        // Display modified EnumMap        System.out.println("em.remove(Colors.YELLOW): " + em);    }}

Output

输出量

EnumMap (em) :{RED=1, BLUE=2, PINK=3, YELLOW=4}em.remove(Colors.YELLOW): {RED=1, BLUE=2, PINK=3}

翻译自:

java enummap