Questions tagged as 'java'

Tagged questions
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Create method that takes the time entered

How can I create a method that takes the time typed in a field? It will grab the contents of the field to save to the database. I use pojo and Dao. I made a well-summed example, what I need to do is a method that takes this String content...
asked by 01.07.2017 / 00:47
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Save background and text in a database

My project is simple, a grid view, with several buttons, and in the click of them opens a popup with 3 options and in the click of them, arrows a text and a background in the button, but when I leave the activity and enter them, no are there, wa...
asked by 02.07.2017 / 20:23
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Create a Download according to element id

I created a system that uploads several files, however I ran into the following problem: I need to create a way to download according to the id of the element in the database. I wonder if anyone has an idea that I can take advantage of to do thi...
asked by 03.07.2017 / 14:48
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generate a json file with java

   Iterative Insertion: 7841910ns - 7ms       Iterative selection: 2677762ns - 2ms       Iterative merge: 708154ns - 0ms This algorithm was made in Java , in the java console is printed several values, being: search algorithm name t...
asked by 30.04.2015 / 00:59
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Error in method: removeEditoraPrevious

I'm a beginner in Java, and I'm having an error in a method of the Edit class, to remove the publisher. The method to remove an author works perfectly with the same logic, since in the remove editor method it gives this error: Followthecode:...
asked by 30.06.2017 / 04:32
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save the data coming from the parse (back4app) in the memory of the cell phone

I'm trying to save the data coming from the parse on the device, when it has internet connection it works, but when it does not it does not work so the data only appear when there is internet parse offers this line code for the procedure...
asked by 30.06.2017 / 03:04
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File Path (Java Web)

I'm working on a web project and I'm having a problem with files ( java.io.File ). The problem is only when I am running the web application, if it is Java Application the problem does not exist. When instantiating a file, new...
asked by 29.06.2017 / 20:51
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Recording Files in Java

I need to write student names and notes, follow the code ( switch is for implementation of other functions in the future). I enter the class (with the directory and name of the text file), the name of the student and his notes and save...
asked by 29.06.2017 / 22:47
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Transforms in "dd / MM / yy" format

I've been doing the exercise 6.4 Optional exercises: Caelum's list of contacts with scriptlet and there's a question that says: " 2) Notice that the date appeared in a complicated way Try formatting it using the class SimpleDateFormat " I n...
asked by 04.07.2017 / 04:45
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How to calculate mathematical expressions in a string?

I'm making an application handle an expression. How do I calculate the result of an expression? For example: 3(-9)+50/2 . This expression is typed in TextView .     
asked by 19.02.2015 / 23:11