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Java Program to remove a key from a TreeMap only if it is associated with a given value
Use the remove() method to remove a key from a TreeMap only if it is associated with a given value. Let us first create a TreeMap and add some elements −
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");
To remove a key, set the key and the associated value here. If the associate value exists, then the key will get removed −
m.remove(3, "Australia")
The following is an example to remove a key from a TreeMap only if it is associated with a given value −
Example
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);
}
}Output
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}
Updated on: 30-Jul-2019
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