Init

.envrc

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+use flake .

.gitignore

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+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+replay_pid*

GNUmakefile

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+JAVA_FMT   = google-java-format
+JAVA_FILES = $(shell find . -name '*.java')
+XML_FMT = xmlindent
+XML_FILES = $(shell find . -name '*.xml')
+
+.PHONY: fmt
+fmt:
+	@echo "Formatting all Java files..."
+	@for f in $(JAVA_FILES); do \
+		echo "  $$f"; \
+		$(JAVA_FMT) -i $$f; \
+	done

IntToBinary.java

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+public class IntToBinary {
+  // !!!!! DER REST DER AUFGABE IST IN DER README.md BEANTWORTED !!!!!
+  
+  public int binary(int n) {
+    if (n < 0) {
+      // Invalid input
+      return -1;
+    } else if (n <= 1) {
+      return n;
+    } else {
+      // Prevent adding the numbers by converting to String and convert it back to int after
+      return Integer.parseInt(Integer.toString(binary(n/2)) + (n%2)); 
+    }
+  }
+}

Main.java

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+public class Main {
+    // !!!!!DER REST DER AUFGABE IST IN DER README.md BEANTWORTET!!!!!
+    public static void main(String[] args) {
+        IntToBinary intToBinary = new IntToBinary();
+
+        // Test function:
+        System.out.println(intToBinary.binary(3));
+        System.out.println(intToBinary.binary(6));
+        System.out.println(intToBinary.binary(9));
+    }
+}

flake.lock

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+{
+  "nodes": {
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": "nixpkgs-lib"
+      },
+      "locked": {
+        "lastModified": 1762810396,
+        "narHash": "sha256-dxFVgQPG+R72dkhXTtqUm7KpxElw3u6E+YlQ2WaDgt8=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "0bdadb1b265fb4143a75bd1ec7d8c915898a9923",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1762844143,
+        "narHash": "sha256-SlybxLZ1/e4T2lb1czEtWVzDCVSTvk9WLwGhmxFmBxI=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "9da7f1cf7f8a6e2a7cb3001b048546c92a8258b4",
+        "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
+}

flake.nix

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+{
+  description = "int to binary";
+
+  inputs = {
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs = inputs@{ flake-parts, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      imports = [
+      ];
+      systems = [ "x86_64-linux" "aarch64-linux" "aarch64-darwin" "x86_64-darwin" ];
+      perSystem = { config, self', inputs', pkgs, system, ... }: let
+
+        jdk = pkgs.jdk21.override {
+        };
+
+        buildInputs = [
+          jdk
+        ];
+
+        devTools = [
+          pkgs.google-java-format
+        ];
+
+      in {
+        devShells.default = pkgs.mkShell {
+          buildInputs = buildInputs ++ devTools;
+        };
+
+        packages = {
+          default = pkgs.stdenv.mkDerivation {
+            pname = "int-to-binary";
+            version = "1.0.0";
+
+            src = ./.;
+
+            nativeBuildInputs = buildInputs ++ [ pkgs.makeWrapper ];
+                                    
+            buildPhase = ''
+              javac -Werror -g:none -deprecation -verbose Main.java
+            '';
+
+            installPhase = ''
+              mkdir -p $out/{bin,lib}
+              cp *.class $out/lib
+
+              makeWrapper ${pkgs.lib.getExe jdk} $out/bin/int-to-binary --add-flags "-cp $out/lib/ Main"
+            '';
+          };
+        };
+      };
+      flake = {
+      };
+    };
+}