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Remove a value from TreeMap in Java
Use the remove() method to remove a value from TreeMap.
Create a TreeMap first and add some elements −
TreeMap<Integer,String> m = new TreeMap<Integer,String>(); m.put(1,"PHP"); m.put(2,"jQuery"); m.put(3,"JavaScript"); m.put(4,"Ruby"); m.put(5,"Java"); m.put(6,"AngularJS"); m.put(7,"ExpressJS");
Now, let’s say you need to remove a value with key 5. For that, use the remove() method −
Object ob = m.remove(5);
The following is an example to remove a value from TreeMap −
Example
import java.util.*;
public class Demo {
public static void main(String args[]) {
TreeMap<Integer,String> m = new TreeMap<Integer,String>();
m.put(1,"PHP");
m.put(2,"jQuery");
m.put(3,"JavaScript");
m.put(4,"Ruby");
m.put(5,"Java");
m.put(6,"AngularJS");
m.put(7,"ExpressJS");
System.out.println("TreeMap Elements...");
Collection res = m.values();
Iterator i = res.iterator();
while (i.hasNext()) {
System.out.println(i.next());
}
System.out.println("TreeMap size = "+m.size());
// Remove an element
Object ob = m.remove(5);
System.out.println("
TreeMap after removing a single element...
"+m);
System.out.println("Size of TreeMap now = "+m.size());
}
}Output
TreeMap Elements...
PHP
jQuery
JavaScript
Ruby
Java
AngularJS
ExpressJS
TreeMap size = 7
TreeMap after removing a single element...
{1=PHP, 2=jQuery, 3=JavaScript, 4=Ruby, 6=AngularJS, 7=ExpressJS}
Size of TreeMap now = 6
Updated on: 30-Jul-2019
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