WeakHashMap isEmpty Example
WeakHashMap class isEmpty example. This example shows you how to use isEmpty method.
WeakHashMap class isEmpty example.public boolean isEmpty() Returns true if this map contains no key-value mappings. This result is a snapshot, and may not reflect unprocessed entries that will be removed before next attempted access because they are no longer referenced.
Here is the code
/**
* @ # isEmpty.java
* A class repersenting use to IsEmpty method
* of WeakHashMap class in java.util package
* version 22 May 2008
* author Rose India
*/
import java.util.*;
public class IsEmpty {
public static void main(String args[]) {
WeakHashMap map = new WeakHashMap();
System.out.println("map is empty= " + map.isEmpty());
map.put(1, "A");
map.put(2, "B");
map.put(3, "C");
map.put(4, "D");
System.out.println("map is empty= " + map.isEmpty());
}
} |
Output
map is empty= true
map is empty= false |
|
