Java EnumMap remove()用法及代碼示例

Java中的Java.util.EnumMap.remove(key)方法用於從Map中刪除指定的鍵。

用法:

remove(Object key)

參數：該方法采用一個參數鍵，該參數鍵是要刪除其映射的鍵。

返回值：該方法不返回任何值。

以下程序說明了remove(key)函數的工作方式：
示例1:

// 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<gfg, String> mp = new 
                  EnumMap<gfg, String>(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); 
    } 
}

輸出：

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

示例2:

// 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<gfg, Integer> mp = new 
                   EnumMap<gfg, Integer>(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); 
    } 
}

輸出：

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

相關用法

注：本文由純淨天空篩選整理自akash1295大神的英文原創作品 EnumMap remove() Method in Java。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。