java FileInput FileOutputStream作业

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import java.io.*;

public class Demo01 {
    
    public static void main(String[] args) throws IOException {
        //找到资源
        File oriFile = new File(System.getProperty("user.home")+"/Desktop/a/brest.png");
        File desFile = new File(System.getProperty("user.home")+"/Desktop/b/brest.png");
        //创建缓冲区
        byte buffer[] = new byte[1024];
        //建立连接管道
        FileInputStream input = new FileInputStream(oriFile);
        FileOutputStream output = new FileOutputStream(desFile);
        //开始读取数据
        int length = 0;
        while((length = input.read(buffer))!=-1){
            output.write(buffer,0,length);
        }
        //关闭文件
        input.close();
        output.close();
    }
}