Queues are most commonly used for scheduling and request handling applications. For example, anything where you have one process creating requests and another process handling the requests you would use a queue to hold the requests. Normally a queue is in FIFO order – requests are processed in the order they are received, but they … Read more
String address = “1234 main street”; String[] tokens = address.split(” “); System.out.println(tokens[0]+” “+tokens[1].substring(0,2)); 3 solved Java code Char and Int [closed]
Declare the variable OUTSIDE a the get/post method scope, you will then be able to increment it on each call to the servlet. See below: private int counter; private Object lock; public void init() throws ServletException{ //init lock lock = new Object(); // create variable counter = 0; } public void doGet(HttpServletRequest request, HttpServletResponse response) … Read more
try { String formatted = String.valueOf((int)Double.parseDouble(“12345.0”)); } catch (ParseException e) { // input is not a number } 0 solved How to format this string in java?
From: https://docs.oracle.com/javase/tutorial/java/nutsandbolts/op1.html You can also combine the arithmetic operators with the simple assignment operator to create compound assignments. For example, x+=1; and x=x+1; both increment the value of x by 1. 6 solved What does “+=” operator do? [duplicate]
Introduction The “+=” operator is a shorthand operator used in programming languages such as C, C++, Java, and JavaScript. It is used to add a value to a variable and assign the result to the same variable. This operator is often used in loops and other programming tasks to increment a variable by a certain … Read more
What’s the difference between Calendar.getInstance().get(Calendar.DAY_OF_WEEK) and Calander.DAY_OF_WEEK in java solved What’s the difference between Calendar.getInstance().get(Calendar.DAY_OF_WEEK) and Calander.DAY_OF_WEEK in java
Introduction Calendar is an important class in Java that is used to manipulate dates and times. It is important to understand the difference between Calendar.getInstance().get(Calendar.DAY_OF_WEEK) and Calendar.DAY_OF_WEEK in order to properly use the Calendar class. This article will explain the difference between the two and provide examples of how to use them. Solution Calendar.getInstance().get(Calendar.DAY_OF_WEEK) is … Read more
Simply activate offline persistens as specified in the official documentation: Firebase applications work even if your app temporarily loses its network connection. You can enable disk persistence with just one line of code: FirebaseDatabase.getInstance().setPersistenceEnabled(true); solved How can i make the app work offline with Firebase database
You’re reusing the same string buffer. If you keep putting things into the same buffer without clearing it, you’re obviously going to get extraneous stuff from previous iterations. Simply declare the StringBuffer inside the while loop so that it is created on each iteration. Anyway, you should learn to use your debugger, instead of asking … Read more
Introduction If you are having trouble creating a student and saving it to a MySQL table, you have come to the right place. This post will provide you with a solution to your problem. We will discuss the console error you are receiving and how to troubleshoot it. By the end of this post, you … Read more
count the columns in your statement! There are seven columns but six values: INSERT INTO alumnos(legajo,nombre,apellido,curso,dni,edad,fechanc) ” + “VALUES(?,?,?,?,?,?)”); you easily forgott a questionmark(column place holder) try this: INSERT INTO alumnos(legajo,nombre,apellido,curso,dni,edad,fechanc) ” + “VALUES(?,?,?,?,?,?,?)”); solved I can create a student but it doesn’t save on mysql table. i get a console error that i can … Read more
A for loop with a test should do the trick. BitSet bs = new BitSet(100000000); for (int i = 0; i < 100000000; i++) {bs.set(i);} long stDate = System.currentTimeMillis(); for (int i = 0; (i = bs.nextSetBit(i + 1)) >= 0;) {// TODO} long endDate = System.currentTimeMillis(); System.out.println(endDate – stDate); byte[] bytes = new byte[100000000]; … Read more
You can start number that would normally be last in that row for every even row. That is your starting number will be i-1 larger that it would normally be, and instead of count++ you count–. public static void main(String args[]) { int count=1; for(int i=1;i<=5;i++) { if (i%2 == 0) { count += i-1; … Read more
If you want to remove all spaces, hyphens and digits from the beginning of the string, as your examples suggest, this regular expression should do the trick: ^[- 0-9]* Demo solved How to remove all the prefix digits in a String value? [duplicate]