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,该键指的是要删除其映射的键。

返回值:该方法不返回任何值。

下面的程序说明了Java.util.EnumMap.remove(key) 功能

Java.util.EnumMap.remove(key)程序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);
    }
}

输出:

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

Java.util.EnumMap.remove(key)程序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);
    }
}

输出:

The EnumMap: {India_today=69, United_States_today=1073}
Map after removal: {India_today=69}
 
转载请保留页面地址:https://www.breakyizhan.com/java/5481.html
扫描二维码添加微信 
  • ,每次淘宝领取淘宝优惠券,淘宝购物更优惠。现在添加微信,还可以领取机械键盘50元优惠券!添加微信后回复机械键盘即可领取!
    支持我们,就用微信淘宝!