hashmap

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ArrayList custom class as HashMap key

I want to store my data in HashMap<Point[], Double>. I used iteration to assign the data, but when I checked at the end, the number of elements is only 1. I have implemented hashCode() and equal[详细]

2023-03-21 19:12 分类：问答
Count number of times a button was pressed in 15 minute chunks

My application has 24 buttons to count different vehicle types and directions (the app will be used to count traffic). Currently, I\'m saving a line to a .csv file each time a button is pressed. The c[详细]

2023-03-21 15:40 分类：问答
Put images in a hashmap?

Can anyone help me how to put images in a hashmap? I tried something like this : HashMap<String, Object> map = new HashMap<String, Object>();[详细]

2023-03-21 13:40 分类：问答
Reducing memory usage of very large HashMap

I have a very large hash map (2+ million entries) that is created by reading in the contents of a CSV file.Some information:[详细]

2023-03-21 07:39 分类：问答
How to Iterate Through Multiple Maps

So essentially, I have two hashmaps, one containing the following values: rId33=image23 rId32=image22 rId37=image2[详细]

2023-03-21 04:40 分类：问答
How to store Java constants for use in building key value combinations

Let\'s say I want to store potential keys and potential values for those keys as constants.How can I achieve this?Or should I avoid it altogether?[详细]

2023-03-21 02:37 分类：问答
listview about adapter, for create a hashmap, why bitmap type imported cannot show image in listview?

list_data = list_data_add(\"111\",\"222\",icon); adapter开发者_运维问答 = new SimpleAdapter( this, list_data, R.layout.list_item_detail,[详细]

2023-03-21 01:02 分类：问答
populate custom multiline listview in android using a hashmap

Hi i am trying to populate a custom listview using arrays from a http client here is a the code could someone please give me a hint of what I am doing wrong[详细]

2023-03-20 23:42 分类：问答
Java ConcurrentHashMap is better than HashMap performance wise?

I was just reading the book Clean Code and came across this statement: When Java was young Doug Lea wrote the seminal book[8] Concurrent[详细]

2023-03-20 01:44 分类：问答
Should I change from buffered read to in-memory/tokenize on Android app for reading a 100,000 line file?

Currently I am loading a text file that contains 100,000 lines into a SortedMap using buffered reads.Should I abandon this approach and instead load the entire file into memory and then tokenize by li[详细]

2023-03-19 17:04 分类：问答