如果对象存在于arraylist中，则递增count，否则将对象添加到arraylist中

import java.util.ArrayList;

public class ObjectCounter {
    public static void main(String[] args) {
        ArrayList<Object> arrayList = new ArrayList<>();
        Object targetObject = new Object(); // 假设目标对象是一个普通的Object

        // 添加一些对象到ArrayList中
        arrayList.add(targetObject);
        arrayList.add(new Object());
        arrayList.add(targetObject);
        arrayList.add(new Object());

        int count = 0;
        for (Object obj : arrayList) {
            if (obj == targetObject) {
                count++;
            }
        }

        System.out.println("Count: " + count);
    }
}