How to Search key in TreeMap Java

import java.util.Map;
import java.util.TreeMap;

public class TreeMapSearchKey {
   
    public static void main(String[] args) {
       
        Map<Integer, String> tm = new TreeMap<Integer,String>();
       
        // add key and values
        tm.put(1,"java");
        tm.put(2,"cpp");
        tm.put(3,"php");
        tm.put(4,"c");
        tm.put(5, "mysql");
       
        //print treemap
   
        System.out.println("TreeMap Is="+tm);
        System.out.println(tm.containsKey(1));
        System.out.println(tm.containsKey(18));
        System.out.println(tm.containsKey(3));
        System.out.println(tm.containsKey(25));
       
       
    }

}

Output:

TreeMap Is={1=java, 2=cpp, 3=php, 4=c, 5=mysql}

true

false

true

false

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How To Remove Element of Vector

import java.util.Vector;

public class RemoveElement {

    public static void main(String[] args) {
      
        Vector<String> vector = new Vector<String>();
        //add element in vector
        vector.add("cricket");
        vector.add("hockey");
        vector.add("football");
        vector.add("tennish");
      
        // print vector
        System.out.println("Vector = "+vector);
      
      
        /*
         * Removes the element at the specified position
         * in this Vector. Shifts any subsequent elements
         * to the left (subtracts one from their indices).
         * Returns the element that was removed from the
         *  Vector.
         */
        vector.remove(1);
      
        System.out.println("After remove element vector is = "+vector);
               
            }
     
}

Output:

Vector = [cricket, hockey, football, tennish]

After remove element vector is = [cricket, football, tennish]