In this example, you wull see how to search a value and key of element in HashMap.

Search a value and key of element in HashMap.

In this example, you will see how to search element in HashMap. And how to search key in HashMap.

containsKey()-- Returns true if key value present in HashMap otherwise returns false.
containsValue()-- Returns true if value present in HashMap otherwise returns false.

import java.util.HashMap;

public class SearchKeyOrValue {
	public static void main(String[] args) {
		// create two Interger array for key and value
		Integer[] intKey = { 2, 4, 6, 3, 1 };
		Integer[] intValues = { 45, 24, 67, 38, 91 };
		// create an empty hash map
		HashMap obHashMap = new HashMap();
		for (int i = 0; i < intValues.length; i++) {
			obHashMap.put(intKey[i], intValues[i]);
		}
		System.out.println("Display entry of HashMap..");
		System.out.println(obHashMap);
		Integer value = new Integer(67);
		Integer key = new Integer(47);
		// containsValue method search an element in HashMap
		if (obHashMap.containsValue(value)) {
			System.out.println("Present : " + value);
		} else {
			System.out.println("Not present : " + value);
		}
		// containsKey method search a key in HashMap
		if (obHashMap.containsKey(key)) {
			System.out.println("Key Present : " + key);
		} else {
			System.out.println("Key not present : " + key);
		}
	}
}

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