Your basic structure here should be pretty simple – just use a multiplier and an if statement with a modulus operator. For example (pseudo-code – check a tutorial if you can’t implement this idea): int multiplier=1; int maxMultiplier = 10; int value = 0; while (multiplier < maxMultiplier) { value = 90 * multiplier; if … Read more
What you are trying to create is actually a download manager. It is easier to create a simple download manager in java but quite tedious to create a full fledged one. The idea behind it is simple. Say you have a webpage with url www.example.com/index.html. to download just index.html is easy. But to download all … Read more
Calendar cal = Calendar.getInstance(); final int minutes = cal.get(Calendar.MINUTE); cal.set (Calendar.MINUTE, minutes – (minutes % 15)); cal.set (Calendar.SECOND, 0); cal.set (Calendar.MILLISECOND, 0); System.out.println (new Date(cal.getTimeInMillis())); solved What’s the best way of truncating Date to 15 minutes interval [duplicate]
Try this import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; import java.util.Scanner; public class ReadFile { public static void main(String[] args) throws IOException { Scanner scanner = new Scanner(System.in); String classroom = scanner.nextLine().toLowerCase(); BufferedReader input = new BufferedReader(new FileReader(“data.txt”)); String data = input.readLine(); int subjectIndex = 10; String[] items = new String[0]; boolean match=false; while (data != … Read more
There is no benefit to packing as much as possible into a line of code. Separate it out as much as possible, make it easy to read. Strictly speaking, there is no need to call join() in this instance. The purpose of join is to make one thread wait for another thread to finish, but … Read more
Thanks for the responses, I needed to assign the size of the array. public void stage1init() { stage1.stageW = 30; stage1.stageH = 30; stage1.tileSize = 100; stage1.stageStartX = 2; stage1.stageStartY = 24; stage1.TilePositionX = new double[stage1.stageW][stage1.stageH]; stage1.TilePositionY = new double[stage1.stageW][stage1.stageH]; //Layout Stage1 int W = stage1.stageH; int H = stage1.stageW; for(int i = 0; i … Read more
This is a bit broad for an SO question but I’ll bite. Your mapper is for mapping values to keys. Lets say your CSV has 4 columns with numeric values: 42, 71, 45, 22 You map a key to each value; effectively what would be like the header in the CSV. Lets say column 4 … Read more
class Super{ void superMethod(){} } class Sub extends Super{ void subMethod(){} } class Sub2 extends Super{ void subMethod2(){} } static <T extends Super> void processSuper(T input){ // this is safe and compiles input.superMethod(); // this doesn’t compile input.subMethod(); // nor this input.subMethod2(); } Look at the above code snippet. When we use an extends Bound, … Read more
You would use a Static Factory public class Test{ private Test() { //Prevent construction by other classes, forcing the // use of the factory } public static Test create(){ return new Test(); } public static void main (String[] args){ Test ob = Test.create(); } } I’ve made a few changes to your example to show … Read more
If the constructor runs , it itself means that an object has been instantiated. The constructor of a class is called it itself means that the object has been created. So, keep it simply.. public class Test { public float a1; public int b1; public double c1; public Boolean ifConsUsed = false; public Test(float a, … Read more
Ok first open a gradle project and add these dependencies: implementation ‘com.google.code.gson:gson:2.8.5’ implementation ‘com.squareup.retrofit2:retrofit:2.4.0’ implementation ‘com.squareup.retrofit2:converter-gson:2.4.0’ Then make an interface for api calls: I have created a dummy for you: import retrofit2.Call; import retrofit2.http.GET; import retrofit2.http.Query; import java.util.List; public interface Api { @GET(“/state”) Call<List<String>> groupList(@Query(“id”) int groupId); } Then add another class for retrofitclient: import … Read more
When you do Type[] arr = { …, … }; that’s an array initializer. It can only be used in array declarations (or in array creation expressions, i.e. new String[]{“a”, “b”}). Arrays.asList is defined to take varargs arguments (asList(T… a)), so you do not have to wrap your arguments in an array first: Arrays.asList(“text”, “tek1”) … Read more
I think your SQL might look something like this: SELECT * FROM Hospital WHERE Postcode = 3000 AND Hospital_id IN (SELECT Hospital_id FROM Hospital_Medical hm INNER JOIN Medical_Service m ON hm.Medical_id = m.Medical_id where Medical_name=”Emergency”) AND Hospital_id IN (SELECT Hospital_id FROM Hospital_Language hl INNER JOIN Language_Service l ON hl.Language_id = l.Language_id where Language_name=”English”) solved Three … Read more
I have implemented it my way. Hope this helps. import java.util.Scanner; class PrimeNumbers { public static void main (String[] args) { Scanner scanner = new Scanner(System.in); int i =0; int num =0; //Empty String String primeNumbers = “”; System.out.println(“Enter the value of n:”); int n = scanner.nextInt(); System.out.println(“Enter the value of m:”); int m = … Read more
If I understand your question, you could use String.replace(CharSequence, CharSequence) like String str=”abcd”; String rep=”cd”; String nv = “kj”; str = str.replace(rep, nv); // <– old, new System.out.println(str); Output is (the requested) abkj 1 solved Replace String variable with exact string