36,051 Topics
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 | hello guys I want to know about dependency injection in angular 4 and spring , so I gonna start with what I know : in angular 4 we inject the dependency by setting the service ( or something else ) in the constructor's arguments of component, and despite we inject … |
 | class robot: def __init__(self, length = 20.0): self.x = 0.0 self.y = 0.0 self.orientation = 0.0 self.length = length self.steering_noise = 0.0 self.distance_noise = 0.0 self.steering_drift = 0.0 def set(self, new_x, new_y, new_orientation): self.x = float(new_x) self.y = float(new_y) self.orientation = float(new_orientation) % (2.0 * pi) def set_noise(self, new_s_noise, new_d_noise): …  |
 | I'm having problems compiling my program, I was wondering if someone could tell me where I went wrong and how to fix it. I would be deeply apreaciative of your help!!!! :) import java.util.Random; import java.io.Console; class project2_0 { int[] race = new int[70]; int tortoise; int hare; Random randomnumbers … |
 | I have this use case where in I would need to dynamically create java objects out of json input and insert the data into sql tables. I tried using gson APIs but unfortunately we need to specify strucuture of that class (Car.class). Is it possible to dynamically achieve the above …  |
 | This time we would like the user to enter the following details for 3 items: name, cost price and quantity. Your program should the print out a receipt including a tax amount of 11.75% on the subtotal of all the three items entered. The receipt should be formatted in columns … |
 | hi i am trying to take an n number of inputs from user where n is user defined .i am a bit confused how to write my jsp so it can as many as inputs required by the user |
 | Hi Guys, Can anyone share the code for HL7 integration with Java. |
 | Hi everyone, I'd like to ask for help modeling my JPA entities and their relationships with each other. I use more abstract class names as class names in my project[](https://phonty.com/), so I'm going to translate that into a "more tangible" example. I start from a festival where several gigs take … |
 | Hi guys, I'm playing around ith optionals a little, but I'm not surewhether this is the correct behavious as I'm getting a null pointer exeption (I thought the point of Optionals was not to get a null pointer.) SO I'm setting an object to null and before calling toString on … |
 | I trying to write a `spring batch` using `SpringBoot`. At first the program will read data from database, then write it to `.csv` file format. This is the code I have tried **Reader** @Bean public ItemReader<A> Reader() throws Exception { List list = new ArrayList<>(); JdbcCursorItemReader<A> reader = new JdbcCursorItemReader<A>(); … |
 | Hello friends, I'm trying to remove all tags from a Wikipedia entry, leaving a simple text file. I have downloaded an HTML file from Wikipedia and hunted through my program. But the tags are not removed properly. Instead, only nonsense comes out of it. Where is my thinker? Java: import …  |
 | I have written a formal Deadlock prevention code but I'm having trouble implementing this algorithm. Any help is appreciated. I have represented the algorithm below, **Formal algorithm description** Data structures at a process i: (It is the initial value in the parentheses.) • OUTi: set of integer, the set of … |
 | i just want to write a code for simple fare calculator using conditional statements in JAVA. whose out should be: Enter the distance covered: 22.6 First 5 KM : 50 Rs. Next 15 KM @12 Rs: 180 Rs. Next 2.6 KM @14 Rs. :36.4 Rs.  |
| | Well, I've been learning Java and I managed to create an FTP client that uploads and downloads files from a server. Oddly, the thing I can't figure out is how to do an FTP delete. Can anyone help me on that? I don't want to use an API or someone …  |
| | Spring Batch exception records inserting in database Hi, I am currently working on project wherein I am reading, validating and then inserting records in database. Now, 1. While validating, if some erroneous record comes up, I have to update its status in db and continue processing next record. 2. If … |
| | I am trying to use the getParent method of the File library. Here is the code I am working with, but I am getting a null string: public class MyCode { public static void main (String[] args) { File f = new File(""); String name = f.getParent(); System.out.println(name); } } … |
 | I am developing a new android app, and I've run into a bit of a snag. While everything else works, I want to have it so that when you click on the screen, it exits the program, same as if you click the back button. How do I get around … |
 | hello i want to create two arrays i have the index for them and the size and have the dot product of a and b and create a third array that is c[i]=a[i]*b[i] however i tried to do it but the output doesn't come the correct :( import java.util.Scanner; public … |
 | Hello everybody, so I am haveing two tables (GUI is used), each has name and number colums, and I want to sum numerical columns only (which I have done) and want to use jtextfield to show user after a button is pressed, strings like "greater, less, equal to". So the … |
 | Hey guys this is my first time using this site. Im having trouble creating a grading scale that averages out grades. Whenever I enter the grades in from the console I get some odd answers that make no sense. Can someone give me some pointers in the right direction? public … |
| | Hello, I would like to develop a sprite editor. Therefore I have programmed a software like paint. As you can see on the picture, on the right, there is a canvas with a grid on it. I use a GridBagLayout to manage every widgets inside my window. The canvas is … |
| | Hi.. Am actually trying to write my final year project on how to use Android phone as remote control for pc.. Pls can anybody put me through on what to do and how to start it because am a newbie trying to build an android app.. Thanks  |
| | I feel hard to understand how the LayoutManager work even the GUI is quite simple. I trying to make the button place below the Tel No JTextField, but it placed beside Address JTextField , not below TelNo JTextField. package gui; import java.awt.BorderLayout; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import javax.swing.Box; … |
| | Hello. I am new to Android Programming, and am using Android Studio to practice with. Right now, I am trying to learn how to create a new Activity and transition from it to my main Activity. So far, I have my MainActivity up and running. The code is: package com.example.cory2.thezoo3; …  |
| | Hi, I am a newbie to Java and I want some help with designing a simple search engine in java. The program would read from a text file and would display the results. If I searched for some keyword say "star" it should show me something like the following: Star …  |
 | i want to show my graph values but its show null output. i show you in image output also // JavaScript Document $(document).ready(function(){ $.ajax({ url: "data.php", method: "GET", success: function(data) { console.log(data); var playerid = []; var score = []; for(var i in data) { playerid.push("Player " + data[i].playerid); score.push(data[i].score); … |
 | import java.util.ArrayList; import java.io.*; import java.util.*; import java.util.Graph; public class Graph { public int[][] adjMatrix;//Edges will be represented as adjacency Matrix int size; } public Graph(int size) { adjMat = new boolean[size][size]; for (int i=0; i < adjMat.length; i++) { for (int j=0; j < adjMat.length; j++) { adjMat[i][j] = … |
 | What are Similarities and differences, written in concise form? Thanks!  |
| | public class Graph { boolean[][] adjMat; // In the adjacency matrix representation of a Graph, // if adjMat[i][j] == true, then you can move from // node i to node j. // i.e. j is a neighbour of i. // The constructor builds the adjacency matrix, // with initially all … |
| | Gud day geeks! This is intended for my thesis! We are creating our own Computer laboratory management with network monitoring system from the computer laboratory users. I would like to know is there other references aside with the wireshark? I've been searching for a month now, the other sources does … |
 | I am trying to learn Volatile keyword in Multi Threading and I came across this statement: *Volatile is preferred in cases when one thread reads and writes a shared variable and other threads just read the same. Whereas if there are more than 2 threads performing read and write both … |
 | I want to store multiple checkboxe values in my sql database. I am using jsp as front end. |
| | Below program in completly executing but no data was inserted through sqlloader. Inline Code Example Here public class CSVDataLoad { public void runSqlldr () throws InterruptedException { String[] stringCommand = { "bash", "-c", "/usr/bin/sqlldr username/password@sid control=/path/to/sample.ctl"}; System.out.println("SQLLDR Started"); Runtime rt = Runtime.getRuntime(); Process proc = null; try { proc = …  |
| | I am trying to understand the SynchronizedMap and I ran the below code. I get the below Output with an exception. According to my understanding the exception is caused when the get() methods are trying to access the syncmap when a thread is still executing a write on the map … |
| | I was wondering what would be the best way to implement an algorythm to figure out what side a circle has collided with a rectangle? After check to make sure a circle has collided with the rectangle im trying to figure out how to know what side of the rectangle … |
| | hi everyone I am currently practicing my java skills by doing this program called car rental management system. I am creating a login page where when the user login it should bring up a dashboard. but the problems when the user login and it say "credentials match, the dashboard doesnt … |
 | Hai Sir, I am confused while creating Invoice system how to add the products item for Single invoice, and save it in MYSQL data base? Thanks and Regards, S. Hari ari |
| | I bought a web site a few months ago thinking that I could go to a community tech school. I have not found the classes that I need. So I don't know how to build it. Help? |
| | In the below code about the synchronisation between threads, according to the output generated why is the control being transferred to the execution of the new thread despite the lock being acquired for the same object "dt" in the main method ? public class DemoThread extends Thread { public DemoThread() … |
| | I am trying to run the below concurrency code: import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import java.util.concurrent.TimeUnit; public class TestThread { public static void main(final String[] arguments) throws InterruptedException { ExecutorService executor = Executors.newSingleThreadExecutor(); try { executor.submit(new Task()); System.out.println("Shutdown executor"); executor.shutdown(); executor.awaitTermination(5, TimeUnit.SECONDS); } catch (InterruptedException e) { System.err.println("tasks interrupted"); } finally … |
| | Hi Guys, Im currantly having a problem with simulating balls bouncing of each other in a 2d space, everything is working and all, but it just doesant seem natural for me... If we had any math wizzes here now is your time please:) my circles are painted inside of rectangles..... … |
 | Hey guys, I am at the very beginning of learning Java and my task right now is to code a maze (2D Array) and let a bot automatically solve that maze using only the right hand rule. If I let the programm run it prints out an infinite number of … |
 | Hi I have made a desktop application and i have to print some data to printer.For this purpose I have done my code and ran it successfuly and test on xps doucuments and on oneNote . I have no physical printer but i am satisfied by testing it on xps … |
| | Hi Guys Its me again, wasnt sure if i should start a new thread so i just did :) I completly redid the code Now im having a problem with the renderer again. It called called in the timer of the controller class... but it doesant get called? Also my … |
| | I am trying to follow the sample of the barcode reader from codelabs. However I am stuck, could someone help me out please. [Codelabs tutorial](https://codelabs.developers.google.com/codelabs/bar-codes/#0) I have updated the manifests to include the vision libaries. import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.drawable.BitmapDrawable; import android.os.Bundle; import android.util.SparseArray; import android.view.View; import … |
| | Currantly trying to make a simple game but i cant get the renderer to repaint. My problem is that i used to make everything in 1 class... much simpler. But now im just not sure anymore. This is what i have so far... it just wont repaint. (Note i have … |
| | Hi! I have developed a desktop application in java. Now I want to do payment integration with this app. Actually I have to do payment integration for first time in my life. So i have some questions/confusions for payment integration. But before asking those questions I tell you that what … |
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| | Hi Guys Just starting to make my first java game, im getting a few errors. Im just trying to figure a few things about about the game loops before i get started and this is driving me crazy when i just call the renderer to repaint after i initialize the … |
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