使用java8[duplicate]统计数组列表中特定对象的出现次数

比方说,我有一个数组列表:

catalog id--->901
Catalog name --->series277
catalog id--->901
Catalog name --->series277
catalog id--->545
Catalog name --->series285
catalog id--->545
Catalog name --->series285
catalog id--->545
Catalog name --->series285
catalog id--->546
Catalog name --->series685
catalog id--->546
Catalog name --->series685
catalog id--->40962
Catalog name --->series19348
catalog id--->40962
Catalog name --->series19348
catalog id--->40962
Catalog name --->series19348
catalog id--->40962

从这个列表中,我想找到发生的次数如下。

catalog id--->901    -- 2
catalog id--->545    -- 3
catalog id--->546    -- 2
catalog id--->40962  -- 4

我的目标是,根据 id 我想创建一个循环来进一步迭代。

请查找用于创建Arraylist的java代码

List<Catalog> catalogList2 = new ArrayList<Catalog>();
for (SearchHit hit1 : searchHits2)
{
  sourceAsMap2 = hit1.getSourceAsMap();
  catalog2 = new Catalog();
  catalog2.setId(String.valueOf(sourceAsMap2.get("catalog_id")));
  catalog2.setCatalog_name(String.valueOf(sourceAsMap2.get("catalog_name")));
  catalogList2.add(catalog2);
}

更新

试图实现以下情况:

for(int i=0;i<catalogList2.size();i++) {

        // want to find the number of occurances for catalog.getId()
        //Then i want to create a loop based on the number of occurances of catalog id
        for(int i=0;i<catalog_id_occurances.size;i++)
        {
            //Have to do something.
        }

    }