java 把a.txt文件中的内容复制到当前项目目录下的b.txt文件中，2种方式比较复制效率 毫秒比较

package xxx;

import java.io.*;
public class JavaApplication1 {
    public static void main(String[] args) throws IOException {
        long start = System.currentTimeMillis();
        method1("E:/eclipse-workspace/java2/data/a.txt", "E:/eclipse-workspace/java2/data/b.txt");
        method2("E:/eclipse-workspace/java2/data/a.txt", "E:/eclipse-workspace/java2/data/b.txt");
        long end = System.currentTimeMillis();
        System.out.println("共耗时：" + (end - start) + "毫秒");
    }
    // 基本字节流一次读写一个字节
    public static void method1(String srcString, String destString) throws IOException {
        FileInputStream fis = new FileInputStream(srcString);
        FileOutputStream fos = new FileOutputStream(destString);
        int by = 0;
        while ((by = fis.read()) != -1) {
            fos.write(by);
        }
        fos.close();
        fis.close();
    }
    // 基本字节流一次读写一个字节数组
    public static void method2(String srcString, String destString) throws IOException {
        FileInputStream fis = new FileInputStream(srcString);
        FileOutputStream fos = new FileOutputStream(destString);
        byte[] bys = new byte[1024];
        int len = 0;
        while ((len = fis.read(bys)) != -1) {
            fos.write(bys, 0, len);
        }
        fos.close();
        fis.close();
    }
}

输出结果：
（1）基本字节流一次读写一个字节

（2）基本字节流一次读写一个字节数组

第一种方法读写速度优于第二种方法