Java遍历D盘打印文件路径和大小

public class Main {
	public static void main(String args[]) {
		
		String filePath = "D:\\";
		Main m1 = new Main();
		File file  = new File(filePath);
		m1.test(file);
	}

	private void test(File file) {
		Map<String,String> fileList =new HashMap<String, String>();
		//判断是否为文件夹
		if(file.isDirectory()){
			File[] files = file.listFiles();
			if(files != null){
				for(int i = 0;i < files.length;i++){
					test(files[i]);
				}
			}
		}else if(file != null){
			String key = file.getAbsolutePath();
			Long lastTime= file.lastModified();
			Calendar cal = Calendar.getInstance();  
			cal.setTimeInMillis(lastTime); 
			@SuppressWarnings("deprecation")
			String value = cal.getTime().toLocaleString();
	        fileList.put(key, value);
		}
		for (Entry<String, String> entry : fileList.entrySet()) { 
			  System.out.println(entry.getKey() + "    最后修改时间：  " + entry.getValue()); 
			}
	}
}