java.util HashMap is a class that belongs to the java.util package in Java. It provides a map-based data structure that allows the storage and retrieval of key-value pairs. One of the methods provided by HashMap is the isEmpty() method, which returns true if the map contains no key-value mappings.
Example 1: Checking if HashMap is Empty
HashMap map = new HashMap<>(); if (map.isEmpty()) { System.out.println("Map is empty"); }
In this example, a new HashMap is created and the isEmpty() method is used to check if the map is empty.
map.clear(); // clear all entries from the map if (map.isEmpty()) { System.out.println("Map is empty"); }
In this example, a HashMap is created with some entries, and the clear() method is used to remove all the entries from the map. The isEmpty() method is then used to check if the map is empty.
Package Library: java.util
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