相同的字符串可以作为synchronized同步锁对象

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java硕哥 2022-12-29 16:26:54 ©著作权

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相同的字符串可以作为同步锁对象

static int cnt1 = 0;
static int cnt2 = 0;

static int cnt =0;
public static void calc(CrawlerMessageProcessed processed){
    String name = processed.getName();
    synchronized (name){
        if(name.equals("21飞天")){
            cnt1++;
        }
        if(name.equals("22飞天")){
            cnt2++;
        }
        cnt++;
    }
}

public static void main(String[] args) throws InterruptedException {
    for (int i = 0; i < 50000; i++) {
        CrawlerMessageProcessed processed = new CrawlerMessageProcessed();
        processed.setName("21飞天");
        new Thread(new Runnable() {
            @Override
            public void run() {
                calc(processed);
            }
        }).start();

        CrawlerMessageProcessed processed2 = new CrawlerMessageProcessed();
        processed2.setName("22飞天");
        new Thread(new Runnable() {
            @Override
            public void run() {
                calc(processed2);
            }
        }).start();
    }

    Thread.sleep(5_000);
    System.out.println("cnt1:"+cnt1+" , cnt2:"+cnt2+",cnt:"+cnt);
}