创建文件夹

package edu.xcdq.demo02;

import java.io.File;

public class Demo02 {
public static void main(String[] args) {
File file = new File("d:/demo");
printTree( file , 0 );
}

public static  void printTree( File file , int leval ) {
    // 缩进
    for ( int i = 0 ; i < leval ; i ++ ) {
        System.out.print("\t");
    }
    System.out.println(file.getPath()); // 打印文件路径

    // 继续判断内部的文件夹
    if ( file.isDirectory() ) {
        leval ++ ;
        File[] files = file.listFiles();
        for ( File f : files ) {
            printTree( f , leval + 1 ); // 自己调用自己  叫做 递归
        }
    }

}

}