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Java program to remove key value from hashmap
Posted: Mar 14, 2016 4:22 PM
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Original Post: Java program to remove key value from hashmap
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1.Basic java example program to remove value from hashmap.
using Object remove(Object key) method we can remove key value pair of hashmap. package com.javaremovevaluehashmap; import java.util.Hashmap; import java.util.Iterator; import java.util.Map; import java.util.Map.Entry; public class HashmapExample{ public static void main(String[] args) { //create an Hashmap object HashMap<String, String> hashmap = new HashMap(); //Add key values pairs to hashmap hashmap.put("1","One"); hashmap.put("2","Two"); hashmap.put("3","Three"); hashmap.put("4","Four"); hashmap.put("5","Five"); hashmap.put("6","Six"); String key=null; String value="java programming basics Interview questions"; hashmap.put(key,value); /* To remove a key value pair from HashMap use Object remove(Object key) method of HashMap class. It returns either the value mapped with the key or null if no value was mapped. */ Object object = hashmap.remove("4"); System.out.println(object + " Removed from HashMap"); if(!hashmap.isEmpty()){ Iterator it=hashmap.entrySet().iterator(); while(it.hasNext()){ Map.Entry obj=(Entry) it.next(); System.out.print(obj.getKey()+" "); System.out.println(obj.getValue()); } } } }
Output: Four Removed from HashMap null java programming basics Interview questions 1 One 2 Two 3 Three 5 Five 6 Six
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