车辆CAN测试小代码2

package test;

import java.util.ArrayList;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.Scanner;

public class CompareName {

	public static void main(String[] args) throws FileNotFoundException {
		System.out.println("开始对比");
		ArrayList array1 = upload("C://Path/To/File"); // 控车前数据
		ArrayList array2 = upload("C://Path/To/File"); // 控车后数据
		System.out.println(getDiffrent(array1, array2));
	}

	public static ArrayList upload(String s) throws FileNotFoundException {
		Scanner scan = new Scanner(new File(s));
		ArrayList array = new ArrayList();
		while (scan.hasNextLine()) {
			String str = scan.nextLine();
			Pattern pattern = Pattern.compile("(?<=can[1-9] ).*?(?=#)");
			Matcher matcher = pattern.matcher(str);
			if (matcher.find())
				;
			array.add(matcher.group());
		}
		scan.close();
		return array;
	}

	public static ArrayList getDiffrent(ArrayList Before, ArrayList After) {
		ArrayList diff = new ArrayList();
		long st = System.nanoTime();
		for (String str : After) {
			if (!Before.contains(str)) {
				diff.add(str);
			}
		}
		System.out.println("total times " + (System.nanoTime() - st));
		return diff;
	}
}