java计数器

public class Counter {
    private int count;

    public Counter() {
        this.count = 0;
    }

    public void increment() {
        count++;
    }

    public void decrement() {
        count--;
    }

    public int getCount() {
        return count;
    }

    public static void main(String[] args) {
        Counter counter = new Counter();

        // 模拟一些事件
        for (int i = 0; i < 10; i++) {
            counter.increment();
        }

        System.out.println("Total events: " + counter.getCount());
    }
}

import java.util.concurrent.atomic.AtomicInteger;

public class AtomicCounter {
    private AtomicInteger count = new AtomicInteger(0);

    public void increment() {
        count.incrementAndGet();
    }

    public int getCount() {
        return count.get();
    }

    public static void main(String[] args) {
        AtomicCounter counter = new AtomicCounter();

        // 模拟并发访问
        for (int i = 0; i < 1000; i++) {
            new Thread(() -> counter.increment()).start();
        }

        // 等待所有线程完成
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        System.out.println("Total events: " + counter.getCount());
    }
}

import java.math.BigInteger;

public class BigIntegerCounter {
    private BigInteger count = BigInteger.ZERO;

    public void increment() {
        count = count.add(BigInteger.ONE);
    }

    public BigInteger getCount() {
        return count;
    }

    public static void main(String[] args) {
        BigIntegerCounter counter = new BigIntegerCounter();

        // 模拟大量事件
        for (int i = 0; i < 1000000; i++) {
            counter.increment();
        }

        System.out.println("Total events: " + counter.getCount());
    }
}