java

[Solved] NullPointerException object and arrays

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The method is lack of a modifier static It should be public static void main(String[] args) {. Change your code of class SearchComparison as follows and you will get the right result. public class SearchComparison { public static void main(String[] args) { StopWatch watch = new StopWatch(); ArrayUtilities utilities = new ArrayUtilities(); watch.start(); utilities.generateRandom(5); watch.stop(); … Read more

[Solved] Flattening nested list in java [closed]

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It seems that a raw list/array needs to be created including fields from Employee and Address (assuming appropriate getters exist in these classes): List<List<Object>> flattened = list.stream() .flatMap(emp -> emp.getAddresses().stream() .map(addr -> Arrays.asList( emp.getName(), emp.getId(), addr.getAddress(), addr.getPostalCode() )) ) .collect(Collectors.toList()); flattened.forEach(System.out::println); // should print desired result solved Flattening nested list in java [closed]

[Solved] To get count of values with respective attribute values in XML using java [closed]

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Nice question…This problem taken me back to basics of java.. Here we go for the solution.. Car.java package com.sof.test; public class Car { private String model; private String version; public String getModel() { return model; } public void setModel(String model) { this.model = model; } public String getVersion() { return version; } public void setVersion(String … Read more

[Solved] How to create various types of inputs in order to test my algorithm? [closed]

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You can use Arrays.sort() to sort your array before feeding it, each of the following describe how to achieve one thing you asked for – try to do each on the array (one at a time) before invoking sort(a) To sort the array in ascending order: Arrays.sort(a); To sort the array in descending order: Arrays.sort(a,Collections.reverseOrder()); … Read more

[Solved] Value with All number except n or n number in Java [closed]

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I’m sorry for my Bad English so you all not uderstand with Question. I’ve solved my problem with this code for(int i=3; i<filteredSubGroupList .length(); i++){ try { filteredSubGroupList = (ProgramMethod.filterArray(subGroupList, “main-group-nr”, String.valueOf(3), false)); } catch (JSONException e) { e.printStackTrace(); } } LOGCAT : I/System.out: 3 I/System.out: [{“zknr”:98,”bezeich”:”CIGARETTE”,”fibukonto”:”14″,”departement”:1,”betriebsnr”:98,”main-group-nr”:3},{“zknr”:700,”bezeich”:”DISCOUNT”,”fibukonto”:”00″,”departement”:1,”betriebsnr”:0,”main-group-nr”:30}] It’s make me get all int except 1 … Read more

[Solved] SQL syntax formatting on Android Studio or IntelliJ?

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IntelliJ support SQL but only the ultimate edition and since the android studio is built on community edition so consequently, it doesn’t support SQL. I looked it up and PyCharm Community Edition does not support database / SQL only the ultimate edition take a look at this comparison and this solved SQL syntax formatting on … Read more

[Solved] My object is not null but I’m getting a NULL POINTER EXCEPTION

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In the stacktrace I see this: java.lang.NullPointerException: Attempt to invoke interface method ‘int java.util.List.size()’ on a null object reference The adapter is trying to call size() on a null List. Make sure your list searchResults is not null. solved My object is not null but I’m getting a NULL POINTER EXCEPTION

[Solved] cannot be resolved to variable

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As others have stated, this site is not a school for learning the basics of the language. But sooner or later people will propably come here in search for an answer to your exact question. You have a huge misunderstand of how Java works. In your code, you are making two mistakes. First, you try … Read more