Java面向对象 - 文件类

第1关：创建文件

package step1;

import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.util.Scanner;

public class Task {
	/********* Begin *********/
	public void solution() throws IOException{
		try {
			File file1 = new File("src/output/hello.txt");
			File file2 = new File("src/output/test.txt");//测试文件里
			file1.createNewFile();
			file2.createNewFile();
		}catch(IOException e){
			e.printStackTrace();
		}
	}
}

2

package step2;

import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.util.Arrays;


public class Task {
	public static void dcFile() throws IOException {
		/********* Begin *********/
		File file=new File("src/test2");
        file.mkdir();
        File file1=new File("src/output/test2.txt");
        file1.delete();
        File file4=new File("src/output/test2");
        file4.delete();
        File file2=new File("src/test2/helloworld.txt");
        file2.createNewFile();
        File file3=new File("src/test2/step2.txt");
		file3.createNewFile();
	File dir=new File("src/output");
    File[] files= dir.listFiles();
    File[] filess=file.listFiles();
    Arrays.sort(files);
    Arrays.sort(filess);
	System.out.println("output目录结构为：");
for(int i=0;i

3

package step3;

import java.io.File;
import java.util.Arrays;

public class Task {
	/********** Begin **********/
public void showDirStructure(File file)	{
		showDir(0,file);
	}
    public void showDir(int spacenum, File file)
    {
        if(file.isDirectory())
        {
           for(int i=0;i

4

package step4;

import java.io.File;
import java.io.FileFilter;
import java.util.Arrays;
public class Task {
	
	/********** Begin **********/
    
	public void showDirStructure(File file)	{
		showDir(0,file);
	}
    public void showDir(int spacenum, File file)
    {
    FileFilter filter=file1->{
    if (file1.isFile()) 
    {
        String fileName = file1.getName().toLowerCase();
        if (fileName.endsWith(".txt") || fileName.endsWith(".docx")) 
        {
          return false;
        }
    }
          return true;
    };//指定过滤规则
        if(file.isDirectory())
        {  
           for(int i=0;i