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Java java 计算文件目录下文件总大小的几种多线程并发实现 
package com.mime;

import java.io.File;

public class TotalFileSizeSequential {
	private long getTotalSizeOfFilesInDir(final File file) {
		if (file.isFile())
			return file.length();
		final File[] children = file.listFiles();
		long total = 0;
		if (children != null)
			for (final File child : children)
				total += getTotalSizeOfFilesInDir(child);
		return total;
	}

	public static void main(final String[] args) {
		final long start = System.nanoTime();
		final long total = new TotalFileSizeSequential()
				.getTotalSizeOfFilesInDir(new File(args[0]));
		final long end = System.nanoTime();
		System.out.println("Total Size: " + total);
		System.out.println("Time taken: " + (end - start) / 1.0e9);
	}
}
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