From 50515d3070194f66ad493a7b560b89f50bafb6ca Mon Sep 17 00:00:00 2001
From: Niket Agrawal <niket.agrawal90@gmail.com>
Date: Tue, 19 Sep 2023 23:39:38 +0530
Subject: [PATCH] Additional Approach Changes

---
 .../AlternativeMultipeTypeList.java           | 46 +++++++++++++++++++
 .../multiple/objecttypes/CustomObject.java    | 10 ++++
 .../objecttypes/UserFunctionalInterface.java  | 18 ++++++++
 3 files changed, 74 insertions(+)
 create mode 100644 core-java-modules/core-java-collections-array-list-2/src/main/java/com/baeldung/list/multiple/objecttypes/AlternativeMultipeTypeList.java
 create mode 100644 core-java-modules/core-java-collections-array-list-2/src/main/java/com/baeldung/list/multiple/objecttypes/UserFunctionalInterface.java

diff --git a/core-java-modules/core-java-collections-array-list-2/src/main/java/com/baeldung/list/multiple/objecttypes/AlternativeMultipeTypeList.java b/core-java-modules/core-java-collections-array-list-2/src/main/java/com/baeldung/list/multiple/objecttypes/AlternativeMultipeTypeList.java
new file mode 100644
index 0000000000..ddef57e41c
--- /dev/null
+++ b/core-java-modules/core-java-collections-array-list-2/src/main/java/com/baeldung/list/multiple/objecttypes/AlternativeMultipeTypeList.java
@@ -0,0 +1,46 @@
+package com.baeldung.list.multiple.objecttypes;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.TreeMap;
+import java.util.function.Predicate;
+
+public class AlternativeMultipeTypeList {
+
+    public static void main(String[] args) {
+        // List of Numbers
+        ArrayList<Number> myList = new ArrayList<>();
+        myList.add(1.2);
+        myList.add(2);
+        myList.add(-3.5);
+
+        // List of Map
+        ArrayList<Map> diffMapList = new ArrayList<>();
+        diffMapList.add(new HashMap<>());
+        diffMapList.add(new TreeMap<>());
+        diffMapList.add(new LinkedHashMap<>());
+
+        ArrayList<CustomObject> objList = new ArrayList<>();
+        objList.add(new CustomObject("obj1", 1));
+        objList.add(new CustomObject("obj2", 2));
+
+        List<Object> dataList = new ArrayList<>();
+
+        Predicate<Object> myPricate = inputData -> (inputData instanceof String || inputData instanceof Integer);
+
+        UserFunctionalInterface myInterface = (listObj, data) -> {
+            if (myPricate.test(data))
+                listObj.add(data);
+            return listObj;
+        };
+
+        myInterface.addToList(dataList, Integer.valueOf(2));
+        myInterface.addToList(dataList, Double.valueOf(3.33));
+        myInterface.addToList(dataList, "String Value");
+        myInterface.printList(dataList);
+    }
+
+}
diff --git a/core-java-modules/core-java-collections-array-list-2/src/main/java/com/baeldung/list/multiple/objecttypes/CustomObject.java b/core-java-modules/core-java-collections-array-list-2/src/main/java/com/baeldung/list/multiple/objecttypes/CustomObject.java
index ae30f2bc1c..f4d4be989d 100644
--- a/core-java-modules/core-java-collections-array-list-2/src/main/java/com/baeldung/list/multiple/objecttypes/CustomObject.java
+++ b/core-java-modules/core-java-collections-array-list-2/src/main/java/com/baeldung/list/multiple/objecttypes/CustomObject.java
@@ -2,12 +2,22 @@ package com.baeldung.list.multiple.objecttypes;
 
 public class CustomObject {
     String classData;
+    Integer intData;
 
     CustomObject(String classData) {
         this.classData = classData;
     }
 
+    CustomObject(String classData, Integer intData) {
+        this.classData = classData;
+        this.intData = intData;
+    }
+
     public String getClassData() {
         return this.classData;
     }
+
+    public Integer getIntData() {
+        return this.intData;
+    }
 }
diff --git a/core-java-modules/core-java-collections-array-list-2/src/main/java/com/baeldung/list/multiple/objecttypes/UserFunctionalInterface.java b/core-java-modules/core-java-collections-array-list-2/src/main/java/com/baeldung/list/multiple/objecttypes/UserFunctionalInterface.java
new file mode 100644
index 0000000000..7e39d5a152
--- /dev/null
+++ b/core-java-modules/core-java-collections-array-list-2/src/main/java/com/baeldung/list/multiple/objecttypes/UserFunctionalInterface.java
@@ -0,0 +1,18 @@
+package com.baeldung.list.multiple.objecttypes;
+
+import java.util.List;
+
+@FunctionalInterface
+public interface UserFunctionalInterface {
+
+    List<Object> addToList(List<Object> list, Object data);
+
+    default void printList(List<Object> dataList) {
+        for (Object data : dataList) {
+            if (data instanceof String stringData)
+                System.out.println("String Data: " + stringData);
+            if (data instanceof Integer intData)
+                System.out.println("Integer Data: " + intData);
+        }
+    }
+}