Java中的 EnumMap remove() 方法

Java中的Java .util.EnumMap.remove( key ) 方法用于从映射中删除指定的键。

句法：

remove(Object key)

参数：该方法采用一个参数键，该键是指要删除其映射的键。

返回值：该方法不返回任何值。

以下程序说明了 remove( key )函数的工作原理：
方案一：

// Java program to demonstrate remove()
import java.util.*;
  
// An enum of geeksforgeeks
public enum gfg {
    India_today,
    United_States_today
}
;
  
class Enum_demo {
    public static void main(String[] args)
    {
  
        EnumMap mp = new 
                  EnumMap(gfg.class);
  
        // Values are associated
        mp.put(gfg.India_today, "61.8%");
        mp.put(gfg.United_States_today, "18.2%");
  
        // Prints the map
        System.out.println("The EnumMap: " + mp);
  
        // Remove mapping of this key
        mp.remove(gfg.United_States_today);
  
        // Prints the final map
        System.out.println("Map after removal: " + mp);
    }
}

输出：

The EnumMap: {India_today=61.8%, United_States_today=18.2%}
Map after removal: {India_today=61.8%}

方案二：

// Java program to demonstrate the working of keySet()
import java.util.*;
  
// an enum of geeksforgeeks
// rank in India and United States
public enum gfg {
  
    India_today,
    United_States_today
}
;
  
class Enum_demo {
    public static void main(String[] args)
    {
  
        EnumMap mp = new 
                   EnumMap(gfg.class);
  
        // Values are associated
        mp.put(gfg.India_today, 69);
        mp.put(gfg.United_States_today, 1073);
  
        // Prints the map
        System.out.println("The EnumMap: " + mp);
  
        // Remove mapping of this key
        mp.remove(gfg.United_States_today);
  
        // Prints the final map
        System.out.println("Map after removal: " + mp);
    }
}

输出：

The EnumMap: {India_today=69, United_States_today=1073}
Map after removal: {India_today=69}