Project setup

.gitignore

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+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

.idea/.gitignore

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+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" project-jdk-name="17" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/com.createXml.iml" filepath="$PROJECT_DIR$/com.createXml.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

com.createXml.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

src/Main.java

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+
+import controller.ObjReader;
+import controller.ObjWriter;
+import model.People;
+import model.Person;
+
+import java.io.File;
+
+public class Main {
+    public static void main(String[] args) {
+        File file = new File("person.bin");
+
+        //Create list
+        People data = new People();
+        //Init list
+        data.add(new Person("Manolo", 32));
+        data.add(new Person("Jorge", 2));
+        data.add(new Person("Pepe", 89));
+
+        //Check writing
+        boolean isWritten = ObjWriter.write(data,file);
+
+        //Test serialization
+        People p;
+        if (isWritten) {
+            p = (People) ObjReader.read(file);
+            System.out.println(p.toString());
+        }
+
+
+    }
+}

src/controller/ObjReader.java

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+package controller;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+
+public class ObjReader {
+    public static Object read(File file) {
+        Object result = null;
+        try (FileInputStream fis = new FileInputStream(file);
+             ObjectInputStream ois = new ObjectInputStream(fis)
+        ){
+            result = ois.readObject();
+        } catch (IOException | ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        }
+        return result;
+    }
+}

src/controller/ObjWriter.java

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+package controller;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectOutputStream;
+
+public class ObjWriter {
+    public static boolean write(Object obj, File out) {
+        try (FileOutputStream fos = new FileOutputStream(out);
+             ObjectOutputStream oos = new ObjectOutputStream(fos)
+        ){
+            oos.writeObject(obj);
+            oos.flush();
+            return true;
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}

src/model/People.java

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+package model;
+
+import java.io.Serial;
+import java.io.Serializable;
+import java.util.ArrayList;
+
+public class People implements Serializable {
+    @Serial
+    private static final long serialVersionUID = 1L;
+    private ArrayList<Person> data ;
+
+    public People() {
+        data = new ArrayList<>();
+    }
+
+    public boolean add(Person p){
+        data.add(p);
+        return true;
+    }
+
+    public boolean remove(Person p){
+        data.remove(p);
+        return true;
+    }
+
+    public ArrayList<Person> getData() {
+        return data;
+    }
+
+    @Override
+    public String toString() {
+        return data.toString();
+    }
+}

src/model/Person.java

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+package model;
+
+import java.io.Serializable;
+
+public class Person implements Serializable {
+    private static int CONT = 0;
+    private int id ;
+    private String name;
+    private int age;
+
+    public Person(String name, int age) {
+        id = ++CONT;
+        this.name = name;
+        this.age = age;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    @Override
+    public String toString() {
+        return "\nID = " + id + ", NAME = " + name + ", AGE = " + age;
+    }
+}