java

[Solved] Android Studio: Cannot resolve symbol ‘activity_profile’

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Introduction This article provides a solution to the error “Cannot resolve symbol ‘activity_profile’” in Android Studio. This error occurs when the activity_profile.xml file is not found in the project. The article explains the steps to resolve this issue and get the project running again. It also provides some tips to avoid this issue in the … Read more

[Solved] Android App Crushing Unexpectedly [closed]

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Since you are using Arrays.asList to create your list, this list is unmodifiable, you cannot add or delete any element. Arrays.asList: Returns a fixed-size list backed by the specified array. So when you get to the line facts.remove(randomNumber); you get an Exception like the following (just guessing because you have not shared any stacktrace or … Read more

[Solved] What does Collections.shuffle function do

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I don’t think you’re really asking about what Collections.shuffle does in general: I think you’re asking why Collections.shuffle affects the output: You are creating a load of tasks of two kinds: one of them increments a value (“kind 1”); the other increments a value and sometimes prints a message (“kind 2”). These are put into … Read more

[Solved] How can I get time for each name

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The variable dateBirth is static. This means that whenever it is changed on one person, it is changed on all of the other people as well. The last person has a date of birth of May 23, 1968, so, since it is the last time the variable is changed, that is what all of the … Read more

[Solved] Add/get methods for lists of objects from different classes

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The source code of Room is wrong. Basically, when you get or add something, you are creating a new room. Use the this qualifier to reference to the current room. public int getBedNumber(int i){ return this.beds.get(i).getNumber(); } public List<Bed> getList() { return this.beds; } public void add(Bed beds) { this.beds.add(beds); } 1 solved Add/get methods … Read more

[Solved] OpenCV: How do I make a Mat colorized where the Mask is white

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I tried switching out and frame in and using frame.copyTo(out, mask) instead of Core.bitwise_and(frame, mask, out) It worked!! Here is my final code: // frame is input, out is output Scalar minValues = new Scalar(RFrom, GFrom, BFrom); Scalar maxValues = new Scalar(RTo, GTo, BTo); Mat mask = new Mat(); Core.inRange(frame, minValues, maxValues, mask); frame.copyTo(out, mask); … Read more

[Solved] Receive json in android

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JSONArray json = new JSONArray(result); First calculate the length of the array! int len=json.length(); String[] str=new String[len]; for(int i=0;i<len;i++) { str[i]=json.get(i).toString(); } First add a spinner to your activity Spinner s=(Spinner)findViewById(R.id.Spinner); ArrayAdapter adapter=new ArrayAdapter(this,android.R.layout.simple_spinner_item,str); s.setAdapter(adapter); solved Receive json in android

[Solved] What does Collections.shuffle function do

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Introduction The Collections.shuffle function is a powerful tool in Java that allows you to randomly rearrange the elements of a collection. This can be useful for a variety of tasks, such as shuffling a deck of cards, randomly selecting elements from a list, or randomly generating numbers. The Collections.shuffle function is easy to use and … Read more

[Solved] convert image inputstream to pdf inputstream – Java

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Some ideas may be useful instead of all the comments.. 🙂 At the risk of stating the obvious, do it in steps. For example … Use avax.imageio.ImageIO to create a java.awt.image.BufferedImage Wrap it as a com.itextpdf.text.Image Embed it in a com.itextpdf.text.PdfDocument Use com.itextpdf.text.DocumentWriter to write the com.itextpdf.text.PdfDocument to a java.io.ByteArrayOutputStream Get the byte[] and wrap … Read more

[Solved] How to split a string at the n’th occurrence of a specific separator in Java [closed]

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You can do something like this: Pattern pat = Pattern.compile(“((?:[^\u0003]*\u0003){30}[^\u0003]*)\u0003(.*)”); Matcher matcher = pat.matcher(input); if (matcher.matches()) { String leftPart = matcher.group(1); String rightPart = matcher.group(2); } The pattern works as follows: The first capture group finds a substring with exactly 30 occurrences of the separator \u0003; the subpattern that finds a substring with no separators, … Read more

[Solved] Extract two numbers from a String with the Java Matcher class

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To use Matcher you start by compiling a Pattern, then you call matcher(String) and then you see if it matches. Finally, you can parse the values. Something like, String str = “views: 120 upvotes: 540”; Pattern p = Pattern.compile(“views:\\s*(\\d+)\\s+upvotes:\\s*(\\d+)”, Pattern.CASE_INSENSITIVE); Matcher m = p.matcher(str); if (m.matches()) { int views = Integer.parseInt(m.group(1)); int upvotes = Integer.parseInt(m.group(2)); … Read more

[Solved] How can I get my threaded program to print specific output

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You could do this easily in two ways: Pass a ‘print token’ between the threads using two semaphores: thread 1 prints, signals semaphore A, waits on semaphore B then loops. Thread 2 waits on semaphore A, prints, signals semaphore B and loops. Write in-line, single-threaded code. 1 solved How can I get my threaded program … Read more