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Java Program to remove a key from a HashMap only if it is associated with a given value
Use the remove() method to remove a key only if it is associated with a given value.
Let’s say the following is our HashMap −
// Create a hash map
HashMap hm = new HashMap();
// Put elements to the map
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));Here, we are removing a key “Belt” only if it is associated with the given value 600 −
hm.remove("Belt", 600);The following is an example to remove a key only if it is associated with a given value −
Example
import java.util.*;
public class Demo {
public static void main(String args[]) {
// Create a hash map
HashMap hm = new HashMap();
// Put elements to the map
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);
// removing a key
hm.remove("Wallet");
System.out.println("
Updated HashMap after removing a key...");
System.out.println(hm);
// removing a key from a HashMap only if it is associated with a given value
hm.remove("Belt", 600);
System.out.println("
Updated HashMap after removing a key associated with a given value...");
System.out.println(hm);
}
}Output
Elements in HashMap...
[Frames=800, Belt=600, Wallet=700, Bag=1100, Sunglasses=2000]
Updated HashMap after removing an key...
[Frames=800, Belt=600, Bag=1100, Sunglasses=2000]
Updated HashMap after removing a key associated with a given value...
{Frames=800, Bag=1100, Sunglasses=2000}
Updated on: 30-Jul-2019
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