JAVA) CMD내 TREE 기능 구현

package MakeDos;

import java.io.*;

import java.util.*;

public class Functions {

    List<ArrayList> dirNames_arr;

    public void showTree(File f) {

        

        List<Integer> dirindexlist = new ArrayList();

        dirNames_arr = new ArrayList();

        List<String> dirNames = new ArrayList();

        List<File> dirFiles = new ArrayList();

        File[] files = f.listFiles();

        // 파라미터로 받은 디렉토리 하위의 모든 폴더에 대한 인덱스값 catch

        int tempindex = 0;

        for (File temp : files) {

            if (temp.isDirectory()) {

                dirindexlist.add(tempindex);

            }

            tempindex++;

        }

        // catch한 인덱스값을 이용하여 폴더들 이름을 ArrayList에 add

        // node 생성을 위한 arr에 add

        for (int i = 0; i < dirindexlist.size(); i++) {

            dirNames.add(files[(dirindexlist.get(i))].getName());

            dirNames_arr.add((ArrayList) dirNames);

        }

        // catch한 인덱스값을 이용하여 폴더들을 ArrayList에 File로 add

        for (int i = 0; i < dirindexlist.size(); i++) {

            dirFiles.add(files[(dirindexlist.get(i))]);

        }

        String nodes = "";

        while (true) {

            if (f.getParentFile() != null) {

                nodes += "";

                if (f.getParentFile().getParentFile() != null) {

                    nodes += "\t";

                    if (f.getParentFile().getParentFile().getParentFile() != null) {

                        nodes += "\t";

                    }

                }

            }

            break;

        } // end - while

        // 출력

        for (int i = 0; i < dirNames.size(); i++) {

            System.out.print(nodes);

            System.out.println(dirNames.get(i));

            showTree(dirFiles.get(i));

        }

    } // end - showTree

    // public void tet(File ff) {

    // System.out.println(ff.getParentFile().getParentFile().getName());

    // }

} // end - class

package MakeDos;

import java.io.*;

import java.util.*;

public class Main {

    public static void main(String[] args) {

        

        Functions fcs = new Functions();

        File f = new File("C:\\Temp");

        fcs.showTree(f);

        

    } // end-main

} // end-class