Fix javaintercompatibility

README.md

@@ -24,11 +24,12 @@ dependencies {
 
 ## Usage
 
+### Kotlin:
 ```kotlin
 fun preload(externalDir: File) =
         FilePreloader.with(::FileMetadata).preloadFrom(externalDir.absolutePath)
 
-fun load() = FilePreloader.with(::FileMetadata).loadFrom(externalDir.absolutePath) {
+fun load() = FilePreloader.with(::FileMetadata).load(externalDir.absolutePath) {
             //Do something with the data
             show(it) //it: List<FileMetadata>
         }
@@ -53,6 +54,43 @@ class FileMetadata(path: String): DataContainer(path) {
 }
 ```
 
+### Java:
+```java
+private static final FilePreloader FILE_PRELOADER = FilePreloader.INSTANCE;
+
+public void preload(File externalDir) {
+    FILE_PRELOADER.with(FileMetadata.class).preloadFrom(externalDir.getAbsolutePath());
+}
+
+public void load(File externalDir) {
+    FILE_PRELOADER.with(FileMetadata.class).load(externalDir.getAbsolutePath(), (fileMetadatas) -> {
+        show(fileMetadatas); //Do something with the data
+    });
+}
+
+private static class FileMetadata extends DataContainer {
+    private final String name;
+    private final String filePath;
+    private final String extension;
+    private final boolean isDirectory;
+
+
+    public FileMetadata(@NonNull String path){
+        super(path);
+        File file = new File(path);
+        name = file.getName();
+        filePath = file.getAbsolutePath();
+        extension = name.substring(name.lastIndexOf('.'));
+        isDirectory = file.isDirectory();
+    }
+
+    @Override
+    public String toString() {
+        return "'" + name + "': {'" + filePath + "', " + isDirectory + ", *." + extension + "}";
+    }
+}
+```
+
 ## Development
 
 Just import to Android Studio as normal!

lib/src/main/java/com/amaze/filepreloaderlibrary/FilePreloader.kt

@@ -1,6 +1,7 @@
 package com.amaze.filepreloaderlibrary
 
 import android.app.Activity
+import com.amaze.filepreloaderlibrary.FilePreloader.with
 import com.amaze.filepreloaderlibrary.datastructures.DataContainer
 import com.amaze.filepreloaderlibrary.datastructures.FetcherFunction
 import com.amaze.filepreloaderlibrary.utils.LIB_CONTEXT
@@ -39,6 +40,20 @@ object FilePreloader {
      *
      * @see [with].
      */
+    fun <D: DataContainer>with(clazz: Class<D>): SpecializedPreloader<D> {
+        //A constructor will obviously produce an instance of the type-parametrized type
+        // from which the constructor has been obtained
+        @Suppress("UNCHECKED_CAST")
+        return with(clazz, clazz.getConstructor(String::class.java)::newInstance as (String) -> D)
+    }
+
+    /**
+     * For compatibity with Java
+     *
+     * If you want to use another method, that's not the constructor, the type still has to be (String) -> D
+     *
+     * @see [with].
+     */
     fun <D: DataContainer>with(clazz: Class<D>, f: FetcherFunction<D>): SpecializedPreloader<D> {
         val v = SpecializedPreloader(clazz, f)
         weakList.add(WeakReference(v))