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
