HashMap in Java
Map in Java has Key-Value pairs To access the value you must know the Key in the HashMap. Hashmap uses a technique of Hashing HashMap does not allow duplicates for the Keys. Below is the simple HashMap program in Java to demonstrate the Key-Value objects in HashMap HashExMain.java: import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.Set; public class HashExMain { public static void main (String [] args){ HashMap<Integer, EmployeeDetails> map = new HashMap<Integer, EmployeeDetails>(); EmployeeDetails empOne = new EmployeeDetails(101, "Andrew Heins"); EmployeeDetails empTwo = new EmployeeDetails(102, "Bill patrick"); map.put(1, empOne); map.put(2, empTwo); for (HashMap.Entry<Integer, EmployeeDetails> entry : map.en...