Change ClassFinder code to be static.

src/org/nwapw/abacus/Abacus.java

@@ -6,7 +6,6 @@ import org.nwapw.abacus.window.Window;
 import org.nwapw.abacus.plugin.ClassFinder;
 
 import javax.swing.*;
-import java.io.File;
 import java.io.IOException;
 import java.util.ArrayList;
 
@@ -26,24 +25,9 @@ public class Abacus {
             e.printStackTrace();
         }
         manager = new PluginManager();
-        ArrayList<String> names = new ArrayList<>();
         try {
-
+            ClassFinder.loadJars("plugins")
-            ClassFinder classFinder = new ClassFinder();
+                    .forEach(plugin -> manager.addClass(plugin));
-            File pluginFile = new File("plugins");
-            for(File classes:pluginFile.listFiles()){
-                if(classes.getName().endsWith(".jar")){
-                    names.addAll(classFinder.addJar(classes));
-                }
-            }
-            for(String name:names){
-                System.out.println(name);
-            }
-            ArrayList<Class> classes = classFinder.getClasses();
-            for(Class classGet:classes){
-                manager.addClass(classGet);
-            }
-
         } catch (IOException | ClassNotFoundException e) {
             e.printStackTrace();
         }

src/org/nwapw/abacus/plugin/ClassFinder.java

@@ -4,48 +4,56 @@ import java.io.File;
 import java.io.IOException;
 import java.net.URL;
 import java.net.URLClassLoader;
+import java.nio.file.Files;
+import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.Enumeration;
 import java.util.jar.JarEntry;
 import java.util.jar.JarFile;
+import java.util.stream.Collectors;
 
+/**
+ * Class that loads plugin classes from their jars.
+ */
 public class ClassFinder {
-    ArrayList<Class> classes;
+
-    URL[] urls;
+    public static ArrayList<Class<?>> loadJars(String filePath) throws IOException, ClassNotFoundException {
-    public ClassFinder(){
+        return loadJars(new File(filePath));
-        classes = new ArrayList();
     }
-    public ArrayList<String> addJar(String path) throws IOException, ClassNotFoundException {
+
-        //urls = new URL[]{new URL("jar:file:" + path + "!/")};
+    public static ArrayList<Class<?>> loadJars(File pluginFolderPath) throws IOException, ClassNotFoundException {
-        return addJar(new File(path));
+        ArrayList<Class<?>> toReturn = new ArrayList<>();
+        if(!pluginFolderPath.exists()) return toReturn;
+        ArrayList<File> files = Files.walk(pluginFolderPath.toPath())
+                .map(Path::toFile)
+                .filter(f -> f.getName().endsWith(".jar"))
+                .collect(Collectors.toCollection(ArrayList::new));
+        for (File file : files){
+            toReturn.addAll(loadJar(file));
+        }
+        return toReturn;
     }
-    public ArrayList<String> addJar(File jarLocation) throws IOException, ClassNotFoundException {
+
+    public static ArrayList<Class<?>> loadJar(String path) throws IOException, ClassNotFoundException {
+        return loadJar(new File(path));
+    }
+
+    public static ArrayList<Class<?>> loadJar(File jarLocation) throws IOException, ClassNotFoundException {
+        ArrayList<Class<?>> loadedClasses = new ArrayList<>();
         String path = jarLocation.getPath();
-        urls = new URL[]{new URL("jar:file:" + path + "!/")};
+        URL[] urls = new URL[]{new URL("jar:file:" + path + "!/")};
+
         URLClassLoader classLoader = URLClassLoader.newInstance(urls);
         JarFile jarFolder = new JarFile(jarLocation);
-        Enumeration jarList = jarFolder.entries();
+        Enumeration jarEntityList = jarFolder.entries();
-        ArrayList<String> classNames = new ArrayList();
+
-        while(jarList.hasMoreElements()){
+        while (jarEntityList.hasMoreElements()) {
-            JarEntry tempJar = (JarEntry)jarList.nextElement();
+            JarEntry jarEntity = (JarEntry) jarEntityList.nextElement();
-            if(tempJar.getName().endsWith(".class")){
+            if (jarEntity.getName().endsWith(".class")) {
-                //System.out.println(tempJar.getName());
+                loadedClasses.add(classLoader.loadClass(jarEntity.getName().replace('/', '.').substring(0, jarEntity.getName().length() - 6)));
-                classNames.add(tempJar.getName());
-                classes.add(classLoader.loadClass(tempJar.getName().replace('/','.').substring(0,tempJar.getName().length()-6)));
             }
         }
-        return classNames;
+        return loadedClasses;
-    }
-    public ArrayList<Class> getClasses(){
-        return classes;
-    }
-    public Class getClass(int number){
-        return classes.get(number);
-    }
-    public void delClasses(){
-        classes=new ArrayList();
-    }
-    public int classCount(){
-        return classes.size();
     }
+
 }