僅當鍵與給定值關聯時,Java 程式從 TreeMap 中移除鍵
僅當 TreeMap 中的鍵與給定值相關聯時,才使用 remove() 方法從 TreeMap 中移除鍵。首先讓我們建立一個 TreeMap 並新增一些元素 -
TreeMap<Integer,String> m = new TreeMap<Integer,String>(); m.put(1,"India"); m.put(2,"US"); m.put(3,"Australia"); m.put(4,"Netherlands"); m.put(5,"Canada");
要移除一個鍵,請在這裡設定鍵和關聯值。如果關聯值存在,則移除鍵 -
m.remove(3, "Australia")
以下是僅當 TreeMap 中的鍵與給定值相關聯時,才從 TreeMap 中移除該鍵的示例 -
示例
import java.util.*;
public class Demo {
public static void main(String args[]){
TreeMap<Integer,String> m = new TreeMap<Integer,String>();
m.put(1,"India");
m.put(2,"US");
m.put(3,"Australia");
m.put(4,"Netherlands");
m.put(5,"Canada");
System.out.println("TreeMap Elements = "+m);
// removing a key associated with a given value
System.out.println("Key removed? "+m.remove(3, "Australia"));
System.out.println("Updated TreeMap Elements = "+m);
}
}輸出
TreeMap Elements = {1=India, 2=US, 3=Australia, 4=Netherlands, 5=Canada}
Key removed? true
Updated TreeMap Elements = {1=India, 2=US, 4=Netherlands, 5=Canada}
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