Java程序，仅当键与给定值关联时才从TreeMap中删除键
remove()仅当键与给定值相关联时，才使用该方法从TreeMap中删除键。让我们首先创建一个TreeMap并添加一些元素-
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");
要删除键，请在此处设置键和相关值。如果存在关联值，则键将被删除-
m.remove(3, "Australia")
以下是一个仅在键与给定值相关联时从TreeMap中删除键的示例-
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);
//删除与给定值关联的键
System.out.println("Key removed? "+m.remove(3, "Australia"));
System.out.println("Updated TreeMap Elements = "+m);
}
}输出结果
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}