java第四次作业

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class Test {
    public static void testFile(File filein, File fileout) throws IOException {
        // 判断文件是否存在
        if (!filein.exists()) {
            System.out.println(filein.getName() + " 不存在 ");
            throw new IOException();
        }
        // 如果文件不存在，创建
        if (!fileout.exists()) {
            fileout.createNewFile();
            throw new IOException();
        }
        FileInputStream in = new FileInputStream(filein);
        FileOutputStream out = new FileOutputStream(fileout);
        int b;

        // copy
        while ((b = in.read()) != -1) {
            out.write(b);
        }
        in.close();
        out.close();
    }

    

    public static void testFileQuick1(File filein, File fileout) throws IOException {
        // 判断文件是否存在
        if (!filein.exists()) {
            System.out.println(filein.getName() + " 不存在 ");
            throw new IOException();
        }
        // 如果文件不存在，创建
        if (!fileout.exists()) {
            fileout.createNewFile();
            throw new IOException();
        }
        FileInputStream in = new FileInputStream(filein);
        FileOutputStream out = new FileOutputStream(fileout);
        byte[] buf = new byte[20 * 1024];
        int bytes = 0;
        // copy
        while ((bytes = in.read(buf, 0, buf.length)) != -1) {
            out.write(buf, 0, bytes);
        }
        in.close();
        out.close();

    }

    public static void main(String[] args) {
        try {
            long start = System.currentTimeMillis();
            Test.testFile(new File("C:\\Users\\cumin\\Desktop\\1.mp3"),
                    new File("C:\\Users\\cumin\\Desktop\\6.mp3 "));
            long end = System.currentTimeMillis();
            System.out.println(end - start);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Test.testFileQuick1(new File("C:\\Users\\cumin\\Desktop\\1.mp3"),
                    new File("C:\\Users\\cumin\\Desktop\\6.mp3 "));
            long end = System.currentTimeMillis();
            System.out.println(end - start);