main

.vscode/launch.json

+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "java",
+            "name": "Launch Current File",
+            "request": "launch",
+            "mainClass": "${file}"
+        }
+    ]
+}
\ No newline at end of file

src/App.java

 import java.util.ArrayList;
 import java.util.Scanner;
 public class App {
-    public static void app(String[] args) {
+    public static void main(String[] args) {
         
         ArrayList<Animals> Animals = new ArrayList<Animals>();
         //  Mammals