Java复习笔记

今天完成了超市管理系统，但是并没有分类的特别清楚，只是将每一个方法都写在了一起，然后通过switch..case的方法来调用，日志文件存储在了txt文件中。

还复习了文件的copy

代码如下：

import java.io.*;

public class Test {
    private static final String srcFile = "";
    private static final String destFile = "";

    public static void copy(File srcFile,File destFile)throws IOException{
        FileReader reader=new FileReader(srcFile);
        FileWriter writer=new FileWriter(destFile);
        int c;
        char[]chars=new char[1024];
        if ((c=reader.read(chars))!=1){
            writer.write(chars,0,c);
        }
        reader.close();
        writer.close();
    }


    public static void copyBuffer(String srcFile,String destFile)throws IOException {
        FileReader reader = new FileReader(srcFile);
        FileWriter writer = new FileWriter(destFile);
        BufferedReader bufferedReader = new BufferedReader(reader);
        BufferedWriter bufferedWriter = new BufferedWriter(writer);
        String str;
        if ((str = bufferedReader.readLine()) != null) {
            bufferedWriter.write(str);
            bufferedWriter.newLine();
        }
        bufferedWriter.close();
        bufferedReader.close();
    }

    public static void copyFile(String srcFile,String destFile){
        try(FileReader reader = new FileReader(srcFile);
            FileWriter writer=new FileWriter(destFile)){
            reader.transferTo(writer);
        }catch (IOException e){
            e.printStackTrace();
        }
    }
}