测试串行与并行的运行速度

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直接上代码

    private static final long count = 10000000;    public static void main(String[] args) throws InterruptedException {        concurrency();        serial();    }    private static void concurrency() throws InterruptedException {        long start = System.currentTimeMillis();        Thread thread = new Thread(new Runnable(){            @Override            public void run() {                int a = 0;                for(long i = 0;i < count;i++){                    a += 5;                }            }        });        thread.start();        int b = 0;        for(long i = 0;i < count;i++){            b--;        }        long time = System.currentTimeMillis() - start;        thread.join();        System.out.println("concurrency :" + time + "ms");    }    private static void serial() {        long start = System.currentTimeMillis();        int a = 0;        for(long i =0;i<count;i++){            a+= 5;        }        int b = 0;        for(long i = 0;i<count;i++){            b--;        }        long time = System.currentTimeMillis() - start;        System.out.println("serail :"+ time + "ms");    }

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