Hashmap in JAVA

Author: anshul17024

Data Structures/Hash Map/hashmap.java

@@ -0,0 +1,44 @@
+// Java program to illustrate 
+// Java.util.HashMap 
+
+import java.util.HashMap; 
+import java.util.Map; 
+
+public class GFG { 
+	public static void main(String[] args) 
+	{ 
+
+		HashMap<String, Integer> map 
+			= new HashMap<>(); 
+
+		print(map); 
+		map.put("vishal", 10); 
+		map.put("sachin", 30); 
+		map.put("vaibhav", 20); 
+
+		System.out.println("Size of map is:- "
+						+ map.size()); 
+
+		print(map); 
+		if (map.containsKey("vishal")) { 
+			Integer a = map.get("vishal"); 
+			System.out.println("value for key"
+							+ " \"vishal\" is:- "
+							+ a); 
+		} 
+
+		map.clear(); 
+		print(map); 
+	} 
+
+	public static void print(Map<String, Integer> map) 
+	{ 
+		if (map.isEmpty()) { 
+			System.out.println("map is empty"); 
+		} 
+
+		else { 
+			System.out.println(map); 
+		} 
+	} 
+}