java

[Solved] Java > Generate a lot of int

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In Java 8 streams, you can generate a stream of integers between two numbers using: IntStream.range(lower, upper)… If you want them to be randomised, then you can use: Random random = new Random(); random.ints(count, lower, upper)… You can then use methods such as forEach, reduce or collect to do something with the stream. So, for … Read more

[Solved] How to get a remainder in java

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From your comment, it looks like you just need help with who will be left without a car. You need to use modular division (some people call it remainder) with the percent sign (%). Here is the line of code you are missing: System.out.println(“Amount of people without a car: “+students%sum); The full code for the … Read more

[Solved] Accessing scope of a variable once declared outside class

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import java.util.Arrays; public class Kata { public static int findShort(String s) { int shortestLocation = null; this ^^ line needs to be initialized to an integer… not ‘null’ 0 is fine String[] words = s.split(“”); int shortestLength=(words[0]).length(); for(int i=1;i<words.length;i++){ your problem starts here ^^ you never iterate through all of the words as you stop … Read more

[Solved] how to achieve polymorphism in java [closed]

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Polymorphism in simple terms Polymorphism means “Many forms or shapes”, which is a phenomenon where objects behave differently although they are closely related. In the following example we have Cat, Dog and Wolf which are all Animal therefore are related but they perform “makesound” differently. In Java the fact that they are related is denoted … Read more

[Solved] what is in java importing packages

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File.createNewFile() create new file if not exists already. public boolean createNewFile() throws IOException Atomically creates a new, empty file named by this abstract pathname if and only if a file with this name does not yet exist. The check for the existence of the file and the creation of the file if it does not … Read more

[Solved] how to split a string which contains of ( \n : , .)

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You can use Pattern for regex split String fields = “name[Employee Name], employeeno[Employee No], dob[Date of Birth], joindate[Date of Joining]”; Pattern pattern = Pattern.compile(“\\[.+\\]+?,?\\s*” ); String[] split = pattern.split(fields); References: How to split this string using Java Regular Expressions 0 solved how to split a string which contains of ( \n : , .)

[Solved] android studio : findViewById return NULL Pointer [duplicate]

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<RelativeLayout xmlns:android=”http://schemas.android.com/apk/res/android” xmlns:tools=”http://schemas.android.com/tools” android:layout_width=”match_parent” android:layout_height=”match_parent” android:paddingBottom=”@dimen/activity_vertical_margin” android:paddingLeft=”@dimen/activity_horizontal_margin” android:paddingRight=”@dimen/activity_horizontal_margin” android:paddingTop=”@dimen/activity_vertical_margin” tools:context=”bd2c.bd2c_appdemo.MainActivity”> <TextView android:id=”@+id/principal” android:layout_width=”wrap_content” android:layout_height=”wrap_content” android:text=”@string/app_text” /> </RelativeLayout> This is your fixed layout select all copy that and go to your layout select all and paste this. Bingo 🙂 solved android studio : findViewById return NULL Pointer [duplicate]

[Solved] Mobile Apps Java and HTML

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I don’t think you can find this kind of framework. If you meet some problems to use native functions with Qt I recommend you to watch BogDan Vatra videos and pdf https://www.qtdeveloperdays.com/sites/default/files/BogdanVatra_Extending_Qt_Android_Apps_with_JNI.pdf Besides, you should look at the QtAndroidNamespace class and runOnAndroidThread function. Edit : You can find the videos in the Tutorials part of … Read more

[Solved] Garbage collector in java

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At least two, potentially all three of them. Since the local variables are not used after line 11 the JVM is free to set them to null, and they become eligible for garbage collection. From JLS 12.6.1: Optimizing transformations of a program can be designed that reduce the number of objects that are reachable to … Read more

[Solved] Why does my code return 1 always?

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Here’s the problem: double math = 1/k; and formula2 -= 1/k; k is an int variable, so the JVM won’t never return a decimal number in this statement. It will take only two possible values: 0 (if k > 1) or 1 (if k == 1) because the JVM performs the division before promoting the … Read more

[Solved] Java Chat Client.. using .add methood [closed]

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Use ListModel if you want to change the content of a JList dynamically. DefaultListModel listModel = new DefaultListModel(); JList list = new JList(listModel); listModel.addElement(“item”); listModel.addElement(“another item”); 4 solved Java Chat Client.. using .add methood [closed]