Questions tagged as 'java'

Tagged questions
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HtttpURLConnection nonexistent functions in Xamarin Forms development (Java to C # system conversion)

I have a system developed in Android Studio and I am passing to Xamarin Forms in C # and there are some errors that I can not solve Summarizing what my system does: It takes the html page and transcribes line by line from the html so I can...
asked by 26.03.2017 / 03:06
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Client / Server / File / Blurry Encryption

Hello, I'm creating a Java Game using LibGdx, but I want to know a few things. What is the best encryption for Client / Server communication (for anyone to intercept the packet I am sending) What is the best encryption for Files (For a...
asked by 23.03.2017 / 21:44
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Is it possible to instantiate ArrayList dynamically in java?

For example, if I need to create arraylists for each person who registers on my system: ArrayList pessoa1 ArrayList(); ArrayList pessoa2 ArrayList(); ArrayList pessoa3 ArrayList(); The problem is that I do not know how many people are going...
asked by 27.03.2017 / 01:53
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Doubt on how to use Shift in Java

Well, I have a question on how to use Shift Left in java. I have a String representing a value in hexadecimal. Except I need to pass this value to binary. For this I use an integer variable to turn this String into a decimal number: int primei...
asked by 27.03.2017 / 03:14
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Save object with uppercase vs. lowercase letter

I think I had posted a question earlier than this, but I did not find it. I have a Manufacturer entity where I want to persist, to avoid differentiating between uppercase and lowercase letters, can I save an Object with all capital letters or...
asked by 28.03.2017 / 03:51
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How to access a specific field of a JSON object using JAVA

I'm using Java to get Twitter information and the ElasticSearch REST client . As a test I made an info PUT in JSON and then used performRequest to get a specific element. //create a json to PUT at the ES Map<String, String>...
asked by 08.08.2017 / 21:20
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How to read the xml for object with XStream

I have a relationship from 1 to product n to historical, ie a product has several months / historical. How to read the following xml to Object? <produto> <descricao>PAVESINO 800X15</descricao> <valor>2.30</valor&...
asked by 03.05.2017 / 21:45
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How to distribute entities between projects?

I doubt if there are good practices for distributing entities between projects. Let's say I have a microservice REST in java, that makes available a client (id, name, address) through the GET and another microservice that needs to consume this f...
asked by 05.05.2017 / 01:16
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Why does the connection pool close before displaying SQLite data?

I'm trying to display DB data in a Recycleview but I get the following error: E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.emerson.drawer, PID: 8316 java.lang.IllegalStateException: Cannot perform th...
asked by 23.03.2017 / 01:39
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JSON does not convert special character?

I have a ArrayList and when I convert it to a Json using Gson the special characters do not match the serialization. Obs My bank and project is in utf8 encoding. I'm serializing ArrayList like this: C...
asked by 21.03.2017 / 22:37