Java: Test if a map contains a mapping for the specified value
Java Collection, HashMap Exercises: Exercise-8 with Solution
Write a Java program to test if a map contains a mapping for the specified value.
Sample Solution:-
Java Code:
import java.util.*;
public class Example8 {
public static void main(String args[]) {
HashMap < Integer, String > hash_map = new HashMap < Integer, String > ();
hash_map.put(1, "Red");
hash_map.put(2, "Green");
hash_map.put(3, "Black");
hash_map.put(4, "White");
hash_map.put(5, "Blue");
// print the map
System.out.println("The Original map: " + hash_map);
System.out.println("1. Is value \'Green\' exists?");
if (hash_map.containsValue("Green")) {
//value exists
System.out.println("Yes! ");
} else {
//value does not exists
System.out.println("no!");
}
System.out.println("\n2. Is value \'orange\' exists?");
if (hash_map.containsValue("orange")) {
System.out.println("yes! - " );
} else {
System.out.println("No!");
}
}
}
Sample Output:
The Original map: {1=Red, 2=Green, 3=Black, 4=White, 5=Blue} 1. Is value 'Green' exists? Yes! 2. Is value 'orange' exists? No!
Java Code Editor:
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