{"id":145740,"date":"2025-07-04T18:41:51","date_gmt":"2025-07-04T13:11:51","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=145740"},"modified":"2025-07-04T18:41:51","modified_gmt":"2025-07-04T13:11:51","slug":"family-tree-builder-using-dsa-java","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/family-tree-builder-using-dsa-java\/","title":{"rendered":"DSA Java Project &#8211; Family Tree Builder"},"content":{"rendered":"<h3>Program 1<\/h3>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">\/\/ Project: Family Tree Builder (Based on BT and Linked list)\r\n\r\n\/*\r\nObjective:\r\nTo create a basic system that allows users to build, manage, and \r\nexplore a family tree structure, where each person can have parent-child \r\nrelationships.\r\nTree Data Structure: Each node represents a person. Nodes can have a parent and \r\nmultiple children.\r\nDynamic Memory Allocation: For creating new family members at runtime.\r\nRecursion: For displaying the tree or searching through it.\r\n\r\nKey Features:\r\n1. Add a New Family Member(person)\r\n2. Set Parents \r\n2. Display the Entire Family Tree\r\n3.Search for a Member\r\n4.Show Ancestors\r\n5. Exit\r\n*\/\r\nimport java.util.Scanner;\r\n\r\nclass Person          \/\/ Node \r\n{\r\n    String name;\r\n    Person father;\r\n    Person mother;\r\n    Person next;  \/\/ To create linked list\r\n\r\n    Person(String name)\r\n     {\r\n        this.name = name;\r\n        this.father = null;\r\n        this.mother = null;\r\n        this.next = null;\r\n    }\r\n}\r\n\r\npublic class FamilyTree \r\n{\r\n    private Person head;\r\n\r\n    public FamilyTree() \r\n    {\r\n        head = null;\r\n    }\r\n\r\n    private Person findPerson(String name) \/\/deepak\r\n    {\r\n        Person temp = head;\r\n        while (temp != null) \r\n        {\r\n            if (temp.name.equalsIgnoreCase(name)) \r\n            {\r\n                return temp;\r\n            }\r\n            temp = temp.next;\r\n        }\r\n        return null;\r\n    }\r\n\r\n    public void addPerson(String name)   \/\/mamta\r\n    {\r\n        if (findPerson(name) != null) \r\n        {\r\n            System.out.println(\"[X] Person already exists.\");\r\n            return;\r\n        }\r\n\r\n        Person newPerson = new Person(name);   \/\/ Node Creation\r\n        if (head == null) \r\n        {\r\n            head = newPerson;\r\n        } else\r\n         {\r\n            Person temp = head;\r\n            while (temp.next != null)\r\n                temp = temp.next;\r\n            temp.next = newPerson;\r\n        }\r\n        System.out.println(\"[\u2713] Person added.\");\r\n    }\r\n\r\n    public void setParents(String childName, String fatherName, String motherName) {\r\n        Person child = findPerson(childName);\r\n        if (child == null)  \/\/child=1011  shubham\r\n        {\r\n            System.out.println(\" [X] Child not found. Please add the person first.\");\r\n            return;\r\n        }\r\n\r\n        Person father = findPerson(fatherName); \/\/father=1166  deepak\r\n        if (father == null)\r\n         {\r\n            System.out.println(\" [X] Father not found. Please add the person first.\");\r\n            return;\r\n        }\r\n\r\n        Person mother = findPerson(motherName);  \/\/2166  mamta\r\n        if (mother == null) \r\n        {\r\n            System.out.println(\" [X] Mother not found. Please add the person first.\");\r\n            return;\r\n        }\r\n\r\n        child.father = father;\r\n        child.mother = mother;\r\n        System.out.println(\" [\u2713]Parents set successfully.\");\r\n    }\r\n\r\n    public void displayTree() \r\n    {\r\n        if (head == null) \r\n        {\r\n            System.out.println(\" [X]No family members found.\");\r\n            return;\r\n        }\r\n\r\n        Person temp = head;\r\n        while (temp != null) \r\n        {\r\n            System.out.println(\"\\n Name: \" + temp.name);\r\n            if (temp.father != null)\r\n                System.out.println(\"    Father: \" + temp.father.name);\r\n            if (temp.mother != null)\r\n                System.out.println(\"    Mother: \" + temp.mother.name);\r\n            temp = temp.next;\r\n        }\r\n    }\r\n\r\n    public void searchPerson(String name)\r\n     {\r\n        Person found = findPerson(name);\r\n        if (found != null)\r\n            System.out.println(\"[\u2713]\" + name + \" is in the family tree.\");\r\n        else\r\n            System.out.println(\"[X]\" + name + \" not found.\");\r\n    }\r\n\r\n    public void showAncestors(String name) \/\/\/\/shubham\r\n    {\r\n        Person person = findPerson(name);\r\n        if (person == null) \r\n        {\r\n            System.out.println(\" [X] Person not found.\");\r\n            return;\r\n        }\r\n\r\n        System.out.println(\"  Ancestors of \" + person.name + \":\");\r\n        printAncestors(person, 1);\r\n    }\r\n\r\n    private void printAncestors(Person person, int level) \r\n    {\r\n        if (person.father != null) \r\n        {\r\n            printIndent(level);\r\n            System.out.println(\"Father: \" + person.father.name);\r\n            printAncestors(person.father, level + 1);\r\n        }\r\n        if (person.mother != null) \r\n        {\r\n            printIndent(level);\r\n            System.out.println(\"Mother: \" + person.mother.name);\r\n            printAncestors(person.mother, level + 1);\r\n        }\r\n    }\r\n\r\n    private void printIndent(int level) \r\n    {\r\n        for (int i = 0; i &lt; level; i++)\r\n            System.out.print(\"  \");\r\n    }\r\n\r\n    public static void main(String[] args)\r\n     {\r\n        Scanner scanner = new Scanner(System.in);\r\n        FamilyTree tree = new FamilyTree();\r\n\r\n        int choice;\r\n        String name, father, mother;\r\n\r\n        do {\r\n            System.out.println(\"\\n=====  Family Tree Builder =====\");\r\n            System.out.println(\"1. Add Person\");\r\n            System.out.println(\"2. Set Parents\");\r\n            System.out.println(\"3. Display Family Tree\");\r\n            System.out.println(\"4. Search Person\");\r\n            System.out.println(\"5. Show Ancestors\");\r\n            System.out.println(\"6. Exit\");\r\n            System.out.println(\"===========================\");\r\n            System.out.print(\"Choose an option: \");\r\n            choice = Integer.parseInt(scanner.nextLine());\r\n\r\n            switch (choice) \r\n            {\r\n                case 1:\r\n                    System.out.print(\"Enter person's name: \");\r\n                    name = scanner.nextLine(); \r\n                    tree.addPerson(name);\r\n                    break;\r\n                case 2:\r\n                    System.out.print(\"Enter child's name: \");\r\n                    name = scanner.nextLine();\r\n                    System.out.print(\"Enter father's name: \");\r\n                    father = scanner.nextLine();\r\n                    System.out.print(\"Enter mother's name: \");\r\n                    mother = scanner.nextLine();\r\n                    tree.setParents(name, father, mother);\r\n                    break;\r\n                case 3:\r\n                    tree.displayTree();\r\n                    break;\r\n                case 4:\r\n                    System.out.print(\"Enter name to search: \");\r\n                    name = scanner.nextLine();\r\n                    tree.searchPerson(name);\r\n                    break;\r\n                case 5:\r\n                    System.out.print(\"Enter name to show ancestors: \");\r\n                    name = scanner.nextLine();\r\n                    tree.showAncestors(name); \r\n                    break;\r\n                case 6:\r\n                    System.out.println(\" Exiting. Goodbye!\");\r\n                    break;\r\n                default:\r\n                    System.out.println(\" Invalid choice. Try again.\");\r\n            }\r\n        } while (choice != 6);\r\n\r\n        scanner.close();\r\n    }\r\n}<\/pre>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Program 1 \/\/ Project: Family Tree Builder (Based on BT and Linked list) \/* Objective: To create a basic system that allows users to build, manage, and explore a family tree structure, where each&#46;&#46;&#46;<\/p>\n","protected":false},"author":581,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[31451],"tags":[32318,34818,32317,34791,32290,34816,34819,34817],"class_list":["post-145740","post","type-post","status-publish","format-standard","hentry","category-dsa-java-tutorials","tag-dsa-java","tag-dsa-java-family-tree-builder-project","tag-dsa-java-program","tag-dsa-java-project","tag-dsa-using-java","tag-family-tree-builder","tag-family-tree-builder-in-dsa-using-java","tag-family-tree-builder-using-dsa-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>DSA Java Project - Family Tree Builder - DataFlair<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/data-flair.training\/blogs\/family-tree-builder-using-dsa-java\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DSA Java Project - Family Tree Builder - DataFlair\" \/>\n<meta property=\"og:description\" content=\"Program 1 \/\/ Project: Family Tree Builder (Based on BT and Linked list) \/* Objective: To create a basic system that allows users to build, manage, and explore a family tree structure, where each&#046;&#046;&#046;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/data-flair.training\/blogs\/family-tree-builder-using-dsa-java\/\" \/>\n<meta property=\"og:site_name\" content=\"DataFlair\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/DataFlairWS\/\" \/>\n<meta property=\"article:published_time\" content=\"2025-07-04T13:11:51+00:00\" \/>\n<meta name=\"author\" content=\"DataFlair Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@DataFlairWS\" \/>\n<meta name=\"twitter:site\" content=\"@DataFlairWS\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"DataFlair Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"DSA Java Project - Family Tree Builder - DataFlair","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/data-flair.training\/blogs\/family-tree-builder-using-dsa-java\/","og_locale":"en_US","og_type":"article","og_title":"DSA Java Project - Family Tree Builder - DataFlair","og_description":"Program 1 \/\/ Project: Family Tree Builder (Based on BT and Linked list) \/* Objective: To create a basic system that allows users to build, manage, and explore a family tree structure, where each&#46;&#46;&#46;","og_url":"https:\/\/data-flair.training\/blogs\/family-tree-builder-using-dsa-java\/","og_site_name":"DataFlair","article_publisher":"https:\/\/www.facebook.com\/DataFlairWS\/","article_published_time":"2025-07-04T13:11:51+00:00","author":"DataFlair Team","twitter_card":"summary_large_image","twitter_creator":"@DataFlairWS","twitter_site":"@DataFlairWS","twitter_misc":{"Written by":"DataFlair Team","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/data-flair.training\/blogs\/family-tree-builder-using-dsa-java\/#article","isPartOf":{"@id":"https:\/\/data-flair.training\/blogs\/family-tree-builder-using-dsa-java\/"},"author":{"name":"DataFlair Team","@id":"https:\/\/data-flair.training\/blogs\/#\/schema\/person\/c187795dc82ab948373cca526df7c445"},"headline":"DSA Java Project &#8211; 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