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Wednesday, 17 June 2015

How to delete all elements from HashMap

import java.util.HashMap;
import java.util.Map;

public class HashMapDeleteAll {
   
    public static void main(String[] args) {
       
    Map<Integer,String> hm = new HashMap<Integer,String>();
       
    /*
     * Associates the specified value with the specified key in
       this map (optional operation). If the map previously
       contained a mapping for the key, the old value is
       replaced by the specified value
     */
        hm.put(1,"ankush");
        hm.put(2, "amit");
        hm.put(3,"shivam");
        hm.put(4,"ankit");
        hm.put(5, "yogesh");
       
        //print hashmap
        System.out.println("Before Clear HashMap is = "+hm);
       
        /*
         * The map will be empty after this call returns.
         */
       
        hm.clear();
       
        System.out.println("After Clear HashMap is ="+hm);
       
    }

}

OutPut:

Before Clear HashMap is = {1=ankush, 2=amit, 3=shivam, 4=ankit, 5=yogesh}

After Clear HashMap is ={}

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