Java

The removeLast() method of LinkedList retrieves and removes the last element in this list. It throws a NoSuchElementException if this list is empty. Syntax Parameters It doesn’t take any parameter Return Value the removed element in this list Exception It throws NoSuchElementException exception if this list is empty. Program 1 Read more…

The removeLastOccurrence(E element) method of LinkedList removes the last occurrence of the specified element from this linked list. It returns true if the list contains the specified element. It returns true if the list contains the specified element. Syntax Parameters e is the element to remove from this linked-list Return Read more…

The size() method of LinkedList returns the number of elements in this linked list. Syntax Parameters It does not take any parameter Return Value It returns the number of elements in this linked list. Program Output Linked List elements: [5, 7, 9, 11, 9] Number of elements in this linked-list: Read more…

The replace(K key, V value) method of HashMap replaces an entry for the specified key. It returns replaced value. It returns null if the map does not contain an entry for the specified key. We can also use the replace(K key, V oldValue, V newValue) method to replace the old Read more…

The containsValue(V value) method of HashMap checks if the map contains the specified value or not. It returns true if the map contains the specified value otherwise it returns false. Some implementations of map throw NullPointerException if the value is null. As HashMap supports null values. So, we can use Read more…

The containsKey(K key) method of HashMap checks if the map contains a specified key or not. It returns true if the map contains the specified key otherwise returns false. Some implementations of map throw NullPointerException if the key is null. As HashMap supports null key. So, we can use this Read more…

The values() method of HashMap returns a collection of the values in this map. Returned collection is backed by the map. This means if the map changes then the returned collection changes. Similarly, if the retuned collection changed then the map changes. Syntax Parameters It does not take any parameter Read more…

The get(K key) method of HashMap returns the value for the specified key. If the map does not contain an entry for the specified key then it returns null. It throws NullPointerException if the specified key is null and this map does not permit null keys. Syntax Parameter The key Read more…

The putAll() method of HashMap copies all the entries of the specified map into this map. It throws NullPointerException if the specified map is null, or if this map does not permit null keys or values, and the specified map contains null keys or values. Syntax Parameters The map we Read more…

The put(key, value) method of HashMap inserts the key-value pair into the map. If the specified key is already available then it replaces the old value with the new value for that key. put method returns the previous value associated with the specified key if there was mapping for the Read more…