We are going to use the Jackson APIs to demonstrate the above requirement. Using the following example, we can store any data structure in a file and load the same data structure into our Java Program using the same file. Pre-requisites: Download Jackson API jars(Jackson Core, Jackson Annotations, Jackson Databind) from https://search.maven.org/ Once downloaded, add the above mentioned JARs to your classpath. Here, I am going to do an example for data structure ArrayList<LinkedHashMap> Step 1: Create sample class (DataStructure) which holds your data structure as a variable. import java.util.ArrayList; import java.util.LinkedHashMap; public class DataStructure { public ArrayList<LinkedHashMap> data = new ArrayList<LinkedHashMap>(); public DataStructure() { } public DataStructure(ArrayList<LinkedHashMap> data) { this.data = data; } } Step 2: Create a method to store the data structure to a File....