Java程序从HashMap中删除键
要从HashMap中删除键，请使用remove()方法。
首先，创建一个HashMap并添加元素-
//创建一个哈希映射
HashMap hm = new HashMap();
//将元素放入映射
hm.put("Bag", new Integer(1100));
hm.put("Sunglasses", new Integer(2000));
hm.put("Frames", new Integer(800));
hm.put("Wallet", new Integer(700));
hm.put("Belt", new Integer(600));现在让我们删除一个键-
hm.remove("Wallet");以下是从HashMap中删除键的示例-
示例
import java.util.*;
public class Demo {
public static void main(String args[]) {
//创建一个哈希映射
HashMap hm = new HashMap();
//将元素放入映射
hm.put("Bag", new Integer(1100));
hm.put("Sunglasses", new Integer(2000));
hm.put("Frames", new Integer(800));
hm.put("Wallet", new Integer(700));
hm.put("Belt", new Integer(600));
System.out.println("Elements in HashMap...");
System.out.println(hm);
hm.remove("Wallet");
System.out.println("\nUpdated HashMap after removing a key...");
System.out.println(hm);
}
}输出结果
Elements in HashMap...
[Frames=800, Belt=600, Wallet=700, Bag=1100, Sunglasses=2000]
Updated HashMap after removing a key...
{Frames=800, Belt=600, Bag=1100, Sunglasses=2000}