[Solved] NullPointerException object and arrays

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]

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]

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]

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]

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?

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

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

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