Initial

.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*

BinaryTree.java

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+public class BinaryTree {
+  private Node rootNode = null;
+  
+  public BinaryTree() {}
+
+  public BinaryTree(int content) {
+    insert(content);
+  }
+
+  public void insert(int content) {
+    if (rootNode == null) {
+      Node newNode = new Node(content);
+      rootNode = newNode;
+    } else {
+      insertRecursiv(rootNode, content);      
+    }
+  }
+
+  private void insertRecursiv(Node currentNode, int content) {
+    int currentContent = currentNode.getContent();
+
+    // has to be inserted left
+    if (currentContent <= content) {
+      // if node == null -> insert left
+      if (currentNode.getLeftNode() == null) {
+        Node newNode = new Node(content);
+        currentNode.setLeftNode(newNode);
+        System.out.println("Inserted Left");
+        return;
+      } else {
+        // traverse -> 1 down
+        insertRecursiv(currentNode.getLeftNode(), content);
+        return;
+      }
+    } else /* insert right */ {
+      // if node == null -> insert right
+      if (currentNode.getRightNode() == null) {
+        Node newNode = new Node(content);
+        currentNode.setRightNode(newNode);
+        System.out.println("Inserted Right");
+        return;
+      } else {
+        // traverse -> 1 down
+        insertRecursiv(currentNode.getRightNode(), content);
+        return;
+      }
+    }
+  }
+}

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

Main.java

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+public class Main {
+    public static void main(String[] args) {
+        BinaryTree binaryTree = new BinaryTree(23);
+        binaryTree.insert(42);
+        binaryTree.insert(23);
+        binaryTree.insert(22);
+        binaryTree.insert(23);
+        binaryTree.insert(55);
+    }
+}

Node.java

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+public class Node {
+  private int content;
+  private Node leftNode;
+  private Node rightNode;
+  
+  public Node() {}
+
+  public Node(int content) {
+    setContent(content);
+  }
+
+  public int getContent() {
+    return content;
+  }
+
+  public void setContent(int content) {
+    this.content = content;
+  }
+
+  public Node getLeftNode() {
+    return leftNode;
+  }
+
+  public Node getRightNode() {
+    return rightNode;    
+  }
+
+  public boolean isEmpty() {
+    if (leftNode == null && rightNode == null) {
+      return true;
+    }
+    return false;
+  }
+
+  public void setRightNode(Node node) {
+    rightNode = node;
+  }
+
+  public void setLeftNode(Node node) {
+    leftNode = node;
+  }
+}

binaryTree.md

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++---------------------------------------+
+|              BinaryTree               |
++---------------------------------------+
+|     - root Node (int)                 |
+|                                       |
++---------------------------------------+
+|                                       |
+|      - Node                           |
+|        - content int                  |
+|        - leftChild Node               |
+|        - rightChild Node              |
++---------------------------------------+
+            

flake.lock

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+{
+  "nodes": {
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": "nixpkgs-lib"
+      },
+      "locked": {
+        "lastModified": 1769996383,
+        "narHash": "sha256-AnYjnFWgS49RlqX7LrC4uA+sCCDBj0Ry/WOJ5XWAsa0=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "57928607ea566b5db3ad13af0e57e921e6b12381",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1770115704,
+        "narHash": "sha256-KHFT9UWOF2yRPlAnSXQJh6uVcgNcWlFqqiAZ7OVlHNc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "e6eae2ee2110f3d31110d5c222cd395303343b08",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-lib": {
+      "locked": {
+        "lastModified": 1769909678,
+        "narHash": "sha256-cBEymOf4/o3FD5AZnzC3J9hLbiZ+QDT/KDuyHXVJOpM=",
+        "owner": "nix-community",
+        "repo": "nixpkgs.lib",
+        "rev": "72716169fe93074c333e8d0173151350670b824c",
+        "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 = "tree";
+
+  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 = "tree";
+            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/tree --add-flags "-cp $out/lib/ Main"
+            '';
+          };
+        };
+      };
+      flake = {
+      };
+    };
+}