5.键盘录入一个文件夹路径,统计该文件夹(包含子文件夹)中每种类型的文件及个数,注意:用文件类型(后缀名,不包含.(点),如："java","txt")作为key,

package zhuofai512;

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Scanner;
import java.util.Set;


public class testFilter {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String str1 = sc.nextLine();
		File file = new File(str1);
		Map<String, Integer> map = new HashMap<String,Integer>();
		System.out.println(getAllJava(file,map));
		Set<String > set = map.keySet();
		for(String s:set) {
			System.out.println(s+"   "+map.get(s));
		}
	}
	private static long getAllJava(File file,Map<String,Integer> map) {
		List<String > list = new ArrayList<String>();
		// TODO Auto-generated method stub
		long d = 0;
		if (file.exists()) {
			System.out.println(file);
			File f[] = file.listFiles(new MyJavaFilter());
			for(File fs:f) {
				if (fs.isDirectory()) {
					getAllJava(fs,map);
				}
				else {
					d = d + fs.length();
					String temp = fs.getName();
					temp = fs.getName().substring(fs.getName().lastIndexOf(".")+1, fs.getName().length());
					System.out.println("    "+fs);		
					boolean panduan = false;
					for(String s:list) {
						panduan = s.equals(temp);
						if (panduan) {
							
							break;
						}
					}
					if (!panduan) {
						list.add(temp);
						map.put(temp, 1);
					}
					else {
						Integer integer = map.get(temp);
						integer++;
						map.put(temp, integer);
					}
				}
				
			}
				
		}
		return d;
	}
}

直接上代码今天写黑马老师的作业，感觉自己又回来了虽然写了好长时间，仔细考虑一定能写出来加油！！！