JAVA IO - 文件size

import java.io.File;
import java.io.FileOutputStream;


public class FileSize {

	/**
	 * @param args
	 */
	public static void main(String[] args) throws Exception {
		File file = new File("C:\\work\\hello\\helloworld.txt");
    	FileOutputStream os = new FileOutputStream(file);
    	for(int i = 0; i < 100000; i++){
    		os.write("This is a file size test".getBytes());
    	}
    	os.close();
    	
    	long length = file.length();
    	System.out.println("File Size " + length/1024 + "K");
    	System.out.println("File Size " + length/1024/1024 + "M");
	}

}