diff --git a/.gitignore b/.gitignore
index 524f096..cebe1ac 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,3 +22,5 @@
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
 replay_pid*
+
+.direnv/
diff --git a/Sort.java b/Sort.java
index 9c885bf..23b8ce9 100644
--- a/Sort.java
+++ b/Sort.java
@@ -1,5 +1,38 @@
-public class Main {
-    public static void main(String[] args) {
-        System.out.println("Hello world!");
+import java.util.Arrays;
+
+public class Sort {
+
+  private static int[] selectionSort1(int[] array) {
+    final int[] hilfsArray = new int[array.length];
+
+    while (array.length != 0) {
+      int indexKleinstesElement = 0;
+      for (int index = 1; index < array.length; index++) {
+        if (array[index] < array[indexKleinstesElement]) indexKleinstesElement = index;
+      }
+
+      // Add to hilfsarray (at curr pos)
+      hilfsArray[hilfsArray.length - array.length] = array[indexKleinstesElement];
+      System.out.println("Sortiere.... hilfsarray: " + Arrays.toString(hilfsArray) + " array: " + Arrays.toString(array));
+
+      // Refill array
+      int[] newArray = new int[array.length - 1];
+
+      // i = index in array, j = index in newArray
+      for (int i = 0, j = 0; i < array.length; i++ ) {
+        if (i != indexKleinstesElement) {
+          newArray[j] = array[i];
+          j++;
+        }
+      }
+      array = newArray;
     }
+    return hilfsArray;
+  }
+
+  public static void main(String[] args) {
+    int[] input = new int[]{9,3,1,5};
+    System.out.println("Input:  " + Arrays.toString(input));
+    System.out.println("Output: " + Arrays.toString(selectionSort1(input)));
+  }
 }
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..5dcbba1
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": "nixpkgs-lib"
+      },
+      "locked": {
+        "lastModified": 1762980239,
+        "narHash": "sha256-8oNVE8TrD19ulHinjaqONf9QWCKK+w4url56cdStMpM=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "52a2caecc898d0b46b2b905f058ccc5081f842da",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1763421233,
+        "narHash": "sha256-Stk9ZYRkGrnnpyJ4eqt9eQtdFWRRIvMxpNRf4sIegnw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "89c2b2330e733d6cdb5eae7b899326930c2c0648",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-lib": {
+      "locked": {
+        "lastModified": 1761765539,
+        "narHash": "sha256-b0yj6kfvO8ApcSE+QmA6mUfu8IYG6/uU28OFn4PaC8M=",
+        "owner": "nix-community",
+        "repo": "nixpkgs.lib",
+        "rev": "719359f4562934ae99f5443f20aa06c2ffff91fc",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nixpkgs.lib",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-parts": "flake-parts",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
index d981005..1c6c3e7 100644
--- a/flake.nix
+++ b/flake.nix
@@ -37,6 +37,7 @@
 
           devTools = [
             pkgs.google-java-format
+            pkgs.jdt-language-server
           ];
 
         in