J250511/01-JavaSE阶段代码/J20250725/Demo05_FileCopy.java

package J20250725;

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

/**
 * @author WanJl
 * @version 1.0
 * @title Demo05_FileInputStream
 * @description 复制文件
 * @create 2025/7/25
 */
public class Demo05_FileCopy {
    public static void main(String[] args) throws IOException {
        long start = System.currentTimeMillis();
        //创建文件字节输入流对象
        FileInputStream fis=new FileInputStream("D:/贺卡/images/blue12.png");
        //创建文件字节输出流对象
        FileOutputStream fos=new FileOutputStream("D:/myImage.png");

        int by; //每一次要读的字节
        while((by=fis.read())!=-1){
            fos.write(by);
        }
        long end = System.currentTimeMillis();

        System.out.println(end-start);
    }
}