Init

.envrc

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+use flake .

.idea/.gitignore

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+# Default ignored files
+/shelf/
+/workspace.xml

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" project-jdk-name="openjdk-25" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/Inventar.iml" filepath="$PROJECT_DIR$/Inventar.iml" />
+    </modules>
+  </component>
+</project>

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
+
+.PHONY: clean
+clean:
+	rm -rf *.class *.~ava result

Gegenstand.java

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+public class Gegenstand {
+  private String name;
+  private int ausdauer;
+
+  public Gegenstand(String name, int ausdauer) {
+    this.name = name;
+    this.ausdauer = ausdauer;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public int getAusdauer() {
+    return ausdauer;
+  }
+}

Inventar.java

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+import java.util.Collections;
+
+public class Inventar {
+  private Gegenstand[] gegenstaende;
+  
+  public Inventar() {
+    this.gegenstaende = new Gegenstand[10];
+    gegenstaende[0] = new Gegenstand ("Bogen", 20);
+    gegenstaende[1] = new Gegenstand ("Gürtel", 10);
+    gegenstaende[2] = new Gegenstand ("Helm", 25);
+    gegenstaende[3] = new Gegenstand ("Pfeile", 5);
+    gegenstaende[4] = new Gegenstand ("Ring", 7);
+    gegenstaende[5] = new Gegenstand ("Schild", 30);
+    gegenstaende[6] = new Gegenstand ("Schwert", 18);
+    gegenstaende[7] = new Gegenstand ("Rüstung", 22);
+    gegenstaende[8] = new Gegenstand ("Stiefel", 16);
+    gegenstaende[9] = new Gegenstand ("Kette", 18);
+
+    gegenstaende = sortArray(gegenstaende);
+
+    for(int i = 0; i < gegenstaende.length; i++) {
+      System.out.println(gegenstaende[i].getName());
+    }
+
+    // Test binary search:
+    int position = binarySearch(gegenstaende, gegenstaende[2].getName());
+    System.out.println("Found " + gegenstaende[position].getName() + " at position: " + position + " with 'ausdauer': " + gegenstaende[position].getAusdauer());
+  }
+
+  public Gegenstand[] sortArray(Gegenstand[] gegenstaende) {
+    // Insertion sort
+
+    for (int index = 1; index < gegenstaende.length; index++) {
+      Gegenstand entry = gegenstaende[index];
+      int previousIndex = index;
+
+      while (previousIndex > 0 && gegenstaende[previousIndex - 1].getName().compareTo(entry.getName()) > 0) {
+        gegenstaende[previousIndex] = gegenstaende[previousIndex - 1];
+        previousIndex--;
+      }
+      gegenstaende[previousIndex] = entry;
+    }
+
+    return gegenstaende;
+  }
+
+  public int binarySearch(Gegenstand[] gegenstaende, String searchedName) {
+    int low = 0;
+    int high = gegenstaende.length-1;
+
+    while(low <= high) {
+      int pivot = (low + high) / 2;
+
+      int compareToResult = gegenstaende[pivot].getName().compareTo(searchedName);
+      if(compareToResult == 0) {
+        return pivot;
+      } else if (compareToResult < 0) {
+        low = pivot + 1;
+      } else if (compareToResult > 0) {
+        high = pivot -1;
+      }
+    }
+    return -1;
+  }
+
+  public void lineareSuche(String name) {
+    // to do
+  }
+
+  public Gegenstand[] getGegenstaende() {
+    return gegenstaende;
+  }
+
+  public void maxAusdauer() {
+    // to do
+  }
+}

Main.java

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+public class Main {
+    public static void main(String[] args) {
+        Inventar inventar = new Inventar();
+    }
+}

README.md

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+## Gerne auch mit nix ausführen!
+Dafür einfach nur in der Konsole (sofern installiert):
+```bash
+nix run
+```

flake.lock

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+{
+  "nodes": {
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": "nixpkgs-lib"
+      },
+      "locked": {
+        "lastModified": 1760948891,
+        "narHash": "sha256-TmWcdiUUaWk8J4lpjzu4gCGxWY6/Ok7mOK4fIFfBuU4=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "864599284fc7c0ba6357ed89ed5e2cd5040f0c04",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1761114652,
+        "narHash": "sha256-f/QCJM/YhrV/lavyCVz8iU3rlZun6d+dAiC3H+CDle4=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "01f116e4df6a15f4ccdffb1bcd41096869fb385c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-lib": {
+      "locked": {
+        "lastModified": 1754788789,
+        "narHash": "sha256-x2rJ+Ovzq0sCMpgfgGaaqgBSwY+LST+WbZ6TytnT9Rk=",
+        "owner": "nix-community",
+        "repo": "nixpkgs.lib",
+        "rev": "a73b9c743612e4244d865a2fdee11865283c04e6",
+        "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 = "Inventar";
+
+  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 = "inventar";
+            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/inventar --add-flags "-cp $out/lib/ Main"
+            '';
+          };
+        };
+      };
+      flake = {
+      };
+    };
+}