Questions tagged as 'java'

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Report of expenses per month within a time range. Java

I'm doing a project similar to an expense manager in Java (every expense has a date and an amount), where I have to make a report. The report should report the cumulative totals of expenses for each year and each month (of the same year). But I...
asked by 22.10.2018 / 21:44
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help to close the program

Hello, I need to close this program but I have a couple of blunders. I need if you can help me find the problem, the program consists of a student registry for scholarships, that the data is by console this is the code. package control8o...
asked by 23.10.2018 / 01:47
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How to end activity using the context?

I'm developing a game, but I'm stuck on how to finish an activity, since the finish() method does not work. From this class I want to be able to finalize an activity, from which I call this class, which passed through the context (cont...
asked by 23.10.2018 / 00:24
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Exception in thread "main" java.lang.NoClassDefFoundError: org / apache / poi / poifs / filesystem / FileMagic

I try to read an Excel file to later operate on the values that are immersed in the cells but I get the following error: "Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/poi/poifs/filesystem/FileMagic" How can I solv...
asked by 22.10.2018 / 22:42
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illegal component position

I have a detail in my application, I have a menu in which is called a JInternalFrame, and something curious happens, when I call it the first time it appears, when I close it with the dispose () function, but ... when I repeat this operation, th...
asked by 23.10.2018 / 22:05
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What is the solution to all present, past and future NullPointerException errors?

I have my Java program and I get a NullPointerException and I have seen other questions but they are from people with other programs and it does not work for my program and I want to leave here the 2,000 lines of my program so that you solve the...
asked by 08.01.2017 / 18:54
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How to upload photos from one frame to another?

Good I'm doing a project for the U! about a film portfolio and I have two classes of one admin and another of portfolio! in the admin class I already have ready in a JFrame to upload photos from the computer but now I can be able to come out in...
asked by 29.10.2018 / 04:15
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Limit from 1 to 30 in an edit (xsl)

I have an edit in XSL and I just want to be able to write from 1 to 30 but I can not find how to do it. I have tried with the min and the max but I see that you can not. Any help? Thanks in advance. <widget size...
asked by 23.10.2018 / 13:54
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how to perform the automatic search when getting the text from a searchview?

Some idea of how to make the search happen automatically when you get the texts with a searchview, without having to press the search button on the keyboard. @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().infla...
asked by 23.10.2018 / 19:15
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Pass JField Text data to a JCombo Box with a button

Good was doing a little exercise: I wanted to press the button to save the info in the combo box, but I can not make it work, I tried different ways to save inside an arrangement to store the info and then show it in the combo box. String[] v_...
asked by 23.10.2018 / 18:12