get key and value from hashmap in java

In this tutorial, we will learn about get key and value from hashmap in java

Example Using Java 8

import java.util.HashMap;
import java.util.Map;

public class KeyValueFromHashMap {

	public static void main(String[] args) {
		try {
			Map<String, String> hashMap = new HashMap();
			hashMap.put("1", "Car");
			hashMap.put("2", "Bus");
			hashMap.put("3", "Train");

			// Below code only work above java 8
			hashMap.forEach((key, value) -> {
				System.out.println("Value of " + key + " is " + value);
			});

		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

Output

Value of 1 is Car
Value of 2 is Bus
Value of 3 is Train

Example using java 7

import java.util.HashMap;
import java.util.Map;

public class KeyValueFromHashMap {

	public static void main(String[] args) {
		try {
			Map<String, String> hashMap = new HashMap();
			hashMap.put("1", "Car");
			hashMap.put("2", "Bus");
			hashMap.put("3", "Train");

			for (Map.Entry<String, String> entry : hashMap.entrySet()) {
				System.out.println(entry.getKey() + " Value is " + entry.getValue());
			}

		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

Output

1 Value is Car
2 Value is Bus
3 Value is Train

GitHub Url

https://github.com/rkumar9090/BeginnersBug/blob/master/BegineersBug/src/com/geeks/example/KeyValueFromHashMap.java

Related Articles

Check key exists in Hashmap Java