java-ArrayList

1.賦值/初始化

 ArrayList<String> IndustryCategoryList=new ArrayList<>()

2.添加元素

for(int i=0;i<res.length;i++){
    word_list.add(res[i]);

3.打印信息
ArrayList<String> IndustryCategoryList=
String[] tt1=IndustryCategoryList.toArray(new String[IndustryCategoryList.size()]);
System.out.println("query_result:\t"+ Arrays.toString(tt1));

二、HashMap
HashMap<String, String> Query4IndustryCategoryHash = new HashMap<>();

Query4IndustryCategoryHash.put(query, category_type);