对于在Java中创建的每个新对象，将对象实例变量加1

public class Counter {
    private static int counter = 0; // 静态变量，用于记录创建的对象数量
    private int instanceVariable; // 实例变量

    public Counter() {
        counter++; // 每次创建新对象时，静态变量加1
        instanceVariable = counter; // 将实例变量设置为当前的计数器值
    }

    public int getInstanceVariable() {
        return instanceVariable;
    }

    public static int getCounter() {
        return counter;
    }
}

import java.util.concurrent.atomic.AtomicInteger;

public class Counter {
    private static AtomicInteger counter = new AtomicInteger(0); // 使用原子整数保证线程安全
    private int instanceVariable;

    public Counter() {
        instanceVariable = counter.incrementAndGet(); // 原子操作，增加计数器并获取新值
    }

    public int getInstanceVariable() {
        return instanceVariable;
    }

    public static int getCounter() {
        return counter.get();
    }
}