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src/main/java/tech/nevets/jamlupdater/Gui.java

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+package tech.nevets.jamlupdater;
+
+import javax.swing.*;
+import java.awt.*;
+
+public class Gui extends JFrame {
+    static JProgressBar progressBar = new JProgressBar();
+    public static final int TASKS = 5;
+    public static int task = 0;
+    public static final int WIDTH = (int) Toolkit.getDefaultToolkit().getScreenSize().getWidth();
+    public static final int HEIGHT = (int) Toolkit.getDefaultToolkit().getScreenSize().getHeight();
+    public Gui() {
+        JPanel contentPane = new JPanel();
+        setResizable(false);
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        setSize(WIDTH / 8, HEIGHT / 8);
+        setContentPane(contentPane);
+        contentPane.setLayout(null);
+
+        int pbWidth = (int) (getWidth() / 1.3);
+        int pbHeight = getHeight() / 8;
+        int pbX = (int) ((getWidth() - pbWidth) / 2.3);
+        int pbY = getHeight() - (pbHeight * 4);
+
+        progressBar.setBounds(pbX, pbY, pbWidth, pbHeight);
+        contentPane.add(progressBar);
+        
+        JLabel label = new JLabel("Updating JAML ...");
+        label.setBounds(40, 30, WIDTH / 12, HEIGHT / 64);
+        contentPane.add(label);
+
+    }
+
+    public static void smoothIncrease() {
+        int i = progressBar.getValue();
+        while (i <= (100 / TASKS) * task) {
+            progressBar.setValue(i);
+            i += 1;
+        }
+    }
+}

src/main/java/tech/nevets/jamlupdater/Main.java

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+package tech.nevets.jamlupdater;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonElement;
+import org.apache.commons.io.FileUtils;
+
+import javax.swing.*;
+import java.io.File;
+import java.io.IOException;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.util.HashMap;
+import java.util.Map;
+
+public class Main {
+    public static File exePath;
+    public static void main(String[] args) {
+        try {
+            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
+        } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException e) {
+            e.printStackTrace();
+            Gui.smoothIncrease();
+        }
+
+        Gui gui = new Gui();
+        gui.setTitle("JAML Autoupdater");
+        gui.setIconImage(new ImageIcon(Main.class.getClassLoader().getResource("icon.png")).getImage());
+        gui.setLocationRelativeTo(null);
+        gui.setVisible(true);
+        Gui.task++;
+        Gui.smoothIncrease();
+
+        if (System.getenv("JAML_HOME") == null) {
+            Gui.task++;
+            exePath = new File(System.getenv("APPDATA") + "\\.jaml\\JAML.exe");
+            Gui.smoothIncrease();
+        } else {
+            Gui.task++;
+            exePath = new File(System.getenv("JAML_HOME") + "\\JAML.exe");
+            Gui.smoothIncrease();
+        }
+
+        try {
+            Gui.task++;
+            String response = getRequest(new URI("https://api.nevets.tech/jaml/version.json"), new HashMap<>());
+            Gui.smoothIncrease();
+
+            Gui.task++;
+            JsonElement versionJson = new Gson().fromJson(response, JsonElement.class);
+            Gui.smoothIncrease();
+
+            Gui.task++;
+            String url = versionJson.getAsJsonObject().get("url").toString().replace("\"", "");
+            Gui.smoothIncrease();
+
+            Gui.task++;
+            FileUtils.copyURLToFile(new URL(url), exePath);
+            Gui.smoothIncrease();
+
+            Runtime.getRuntime().exec(exePath.toString());
+
+            System.exit(0);
+        } catch (URISyntaxException | IOException e) {
+            Gui.task++;
+            Gui.task++;
+            Gui.task++;
+            Gui.task++;
+            Gui.task++;
+            Gui.task++;
+            Gui.task++;
+            Gui.smoothIncrease();
+
+            e.printStackTrace();
+        }
+    }
+
+    public static String getRequest(URI uri, Map<String, String> headers) {
+        try {
+            HttpClient client = HttpClient.newHttpClient();
+            HttpRequest.Builder requestBuilder = HttpRequest.newBuilder()
+                    .GET()
+                    .uri(uri);
+            for (Map.Entry<String, String> pair : headers.entrySet()) {
+                requestBuilder.setHeader(pair.getKey(), pair.getValue());
+            }
+            HttpRequest request = requestBuilder.build();
+            HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
+            return response.body();
+        } catch (IOException | InterruptedException e) {
+            e.printStackTrace();
+            return "";
+        }
+    }
+}