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Check for the existence of a value in Java IdentityHashMap
Use the containsValue() method to check whether a particular value exists in IdentityHashMap or not.
Create a IdentityHashMap
Map<String, Integer> m = newIdentityHashMap<String, Integer>(); m.put("1", 100); m.put("2", 200); m.put("3", 300); m.put("4", 150); m.put("5", 110); m.put("6", 50); m.put("7", 90); m.put("8", 250); m.put("9", 350); m.put("10", 450);
Now, let’s say we need to check whether value 100 exists or not. For that, use the containsValue() method like this
m.containsValue(100)
The following is an example to check for the existence of a value in IdentityHashMap
Example
import java.util.*; public class Demo { public static void main(String[] args) { Map<String, Integer> m = newIdentityHashMap<String, Integer>(); m.put("1", 100); m.put("2", 200); m.put("3", 300); m.put("4", 150); m.put("5", 110); m.put("6", 50); m.put("7", 90); m.put("8", 250); m.put("9", 350); m.put("10", 450); System.out.println("IdentityHashMap elements\n"+ m); System.out.println("Is value 100 in the Map? " + m.containsValue(100)); } }
Output
IdentityHashMap elements {2=200, 4=150, 9=350, 7=90, 10=450, 6=50, 5=110, 8=250, 1=100, 3=300} Is value 100 in the Map? True
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