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题目：编写一个应用程序，输入一个目录和一个文件类型，显示该目录下符合该类型的所有文件。

import java.io.File;
import java.io.FilenameFilter;


public class text implements FilenameFilter{
    String type;
      text(String type){
          this.type=type;
      }
      
    public text() {
        // TODO Auto-generated constructor stub
    }
    @Override
    public boolean accept(File file, String name) {
        // TODO Auto-generate method stub
        return name.endsWith(type);

import java.io.BufferedInputStream;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.InputStream;
import java.io.Writer;
import java.util.Scanner;
public class FileText {
    public static void main(String[] args) {
    File file=new File("C:\\Java");
    FilenameFilter fn=new text("docx");
    String[] names=file.list(fn);
    File[] fr=file.listFiles();
    for(int i=0;i<fr.length;i++){
        System.out.println("目录下下的文件"+fr[i]);
    }
    for(int i=0;i<names.length;i++){
        System.out.println("有DOCX后缀 的文件"+names[i]);
    }
    
    
    
    }
}

 

    }

}

 

之后，将这些文件中的某一个文件剪切到另外一个目录中。

import java.io.BufferedInputStream;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.InputStream;
import java.io.Writer;
import java.util.Scanner;


public class file {
    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);
        System.out.print("请输入目录：\n");
        String way = reader.nextLine();
        File file = new File(way);
        
        System.out.print("请输入需要剪切的文件名：\n");
        String cut = reader.nextLine();
        File cutfile = new File(cut);
        System.out.print("请输入该文件需要移动到的目录：\n");
        String cutway = reader.nextLine();
        File cutlist = new File(cutway);
        File newfile = new File(cutway);
        try {
            newfile.createNewFile();//创建同名文件
        } catch (IOException e) {
            e.printStackTrace();
        }
        InputStream inputStream = null;//读出原文件内容对象创建
        BufferedInputStream bufferedInputStream = null;
        String data="";//内容暂存器
        Writer writer = null;//写入新文件内容对象创建
        BufferedWriter bufferedWriter = null;
        try {
            inputStream = new FileInputStream(cutfile);
            bufferedInputStream = new BufferedInputStream(inputStream);
            byte[] content = new byte[1024];//存储内容
            int count = 0;//记录长度
            while((count = bufferedInputStream.read(content, 0, 1024))!=-1){
                data=data+new String(content, 0, count);//遍历到字节存入字符串
            }
            writer = new FileWriter(newfile);
            bufferedWriter = new BufferedWriter(writer);
            bufferedWriter.write(data);//字符串写入新文件
        } catch (FileNotFoundException e1) {
            e1.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally{
            try {
                bufferedInputStream.close();//关闭流
                inputStream.close();
                bufferedWriter.close();
                writer.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        cutfile.delete();//删除原文件
    }
}