How to merge data of the same objects in Java?

To merge data from the same objects, you can use a Map to achieve this. The specific steps are as follows:

1. Create a Map object to store the merged data.
2. Iterate through the list of objects to be merged, taking out each object one by one.
3. Check whether the object already exists in the Map; if it does, merge the object with the one in the Map; if not, directly place the object in the Map.
4. The method of merging objects can be determined based on specific needs, such as adding values of the same attribute, taking the maximum value, or taking the minimum value, and so on.
5. Finally, the data stored in the Map is the merged data.

Here is a sample code to demonstrate how to merge data from identical objects.

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class ObjectMerge {
    public static void main(String[] args) {
        // 待合并的对象列表
        List<Object> objects = // 获取待合并的对象列表
        // 创建一个Map对象，用于存储合并后的数据
        Map<String, Object> mergedData = new HashMap<>();

        for (Object obj : objects) {
            // 判断该对象是否已存在于Map中
            if (mergedData.containsKey(obj.getKey())) {
                // 如果存在，则将该对象与Map中的对象合并
                mergeObjectData(mergedData.get(obj.getKey()), obj);
            } else {
                // 如果不存在，则将该对象直接放入Map中
                mergedData.put(obj.getKey(), obj);
            }
        }

        // 输出合并后的数据
        for (Object obj : mergedData.values()) {
            System.out.println(obj);
        }
    }

    private static void mergeObjectData(Object existingObj, Object newObj) {
        // 根据具体需求，合并对象的数据
        // 例如，将相同属性的值相加
        existingObj.setValue(existingObj.getValue() + newObj.getValue());
    }
}

In this context, Object represents the type of objects to be merged, getKey() and getValue() are methods for retrieving the key and value of an object, mergeObjectData() is a method for merging object data, and can be customized as needed.