Java WeakHashMap - isEmpty() Method
The java.util.WeakHashMap.isEmpty() method is used to check whether the map is empty or not. It returns true if the map contains no key-value mappings, else returns false.
Syntax
public boolean isEmpty()
Parameters
No parameter is required.
Return Value
Returns true if this map contains no key-value mappings, else returns false.
Exception
NA
Example:
In the example below, the java.util.WeakHashMap.isEmpty() method is used to check whether the map is empty or not.
import java.util.*; public class MyClass { public static void main(String[] args) { //creating a weakhashmap WeakHashMap<Integer, String> MyMap = new WeakHashMap<Integer, String>(); //checking for empty System.out.println("Is MyMap empty?: "+ MyMap.isEmpty()); //populating the map MyMap.put(101, "John"); MyMap.put(102, "Marry"); MyMap.put(103, "Kim"); MyMap.put(104, "Jo"); //checking for empty again System.out.println("Is MyMap empty?: "+ MyMap.isEmpty()); } }
The output of the above code will be:
Is MyMap empty?: true Is MyMap empty?: false
❮ Java.util - WeakHashMap