用FileInputStream和FileOutputStream来实现一个文件移动程序，并测试移动1G文件所需要的时间。

以下是Java代码实现文件移动程序，并计算移动1G文件所需的时间：

import java.io.*;

public class FileMoveExample {
    public static void main(String[] args) {
        long startTime = System.currentTimeMillis();
        try {
            File sourceFile = new File("sourceFile.txt");
            File targetFile = new File("targetFile.txt");

            FileInputStream inputStream = new FileInputStream(sourceFile);
            FileOutputStream outputStream = new FileOutputStream(targetFile);

            byte[] buffer = new byte[1024];
            int length;
            while ((length = inputStream.read(buffer)) > 0) {
                outputStream.write(buffer, 0, length);
            }

            inputStream.close();
            outputStream.close();

            if (sourceFile.delete()) {
                System.out.println("Source file moved successfully!");
            } else {
                System.out.println("Failed to move source file!");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        long endTime = System.currentTimeMillis();
        long timeElapsed = endTime - startTime;
        System.out.println("Time taken to move file: " + timeElapsed + " milliseconds");
    }
}

测试移动1G文件所需的时间：

import java.io.*;

public class FileMoveExample {
    public static void main(String[] args) {
        long startTime = System.currentTimeMillis();
        try {
            File sourceFile = new File("sourceFile.txt");
            File targetFile = new File("targetFile.txt");

            FileInputStream inputStream = new FileInputStream(sourceFile);
            FileOutputStream outputStream = new FileOutputStream(targetFile);

            byte[] buffer = new byte[1024];
            int length;
            while ((length = inputStream.read(buffer)) > 0) {
                outputStream.write(buffer, 0, length);
            }

            inputStream.close();
            outputStream.close();

            if (sourceFile.delete()) {
                System.out.println("Source file moved successfully!");
            } else {
                System.out.println("Failed to move source file!");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        long endTime = System.currentTimeMillis();
        long timeElapsed = endTime - startTime;
        System.out.println("Time taken to move file: " + timeElapsed + " milliseconds");
    }
}

注意：测试移动1G文件所需的时间可能需要等待较长时间，取决于计算机性能和硬盘速度。