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Java is a general-purpose programming language designed to be used in conjunction with the Java Virtual Machine (JVM). "Java platform" is the name for a computing system that has installed tools for developing and running Java programs. Use this tag for questions referring to Java programming ...

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Function Definitions for Interfaces

Hello I have an assignment for my Graphical Programming Paper which requires you to design a Tetris-like game. They give you a skeleton code to start off with which I have posted below. My question is ...
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0answers
2 views

ArrayList of ArrayLists for pegs and discs in towers of hanoi game

I am building a towers of hanoi game that can be played from the console or the command line. Note this isn't a recursive program; I am trying to build a GAME that can be played by the user. I am ...
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5 views

Random Numbers and Counting Occurences in a Loop

I'm very new to Java and currently have an assignment dealing with loops and random numbers. The question is the following: Modify ThrowingPairsOfDice.java to count and the number of times the pair ...
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1answer
6 views

Best method to parse an HTML document and replace whole segments of tags

I am trying to find the best way to parse an HTML document from top to bottom and replace certain groups of tags for something different and create an updated file. I prefer to use Java, VB.NET or ...
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2answers
16 views

Method declaration on employee1 invalid need return type

I am getting an error on public static Employee1 saying it needs a return type required and that the method declaration is invalid. Ive tried changing it around but I don't know what I am doing wrong. ...
1
vote
1answer
28 views

Why does my try/catch block keep looping?

When I run this, the code skips over input.nextInt(); and goes in circles: public static void main(String[] args) { Scanner input = new Scanner(System.in); // Link user to programs (ToC) ...
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0answers
15 views

Permutations using a 2D array

I need to write a short program that is able to output the permutations of the input which can be one of the following integers: 1, 2, 3, 4, 5 or 6. I need to store the permutations of in a 2D array ...
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0answers
10 views

Insertion into a priority queue implemented by doubly linked list with sentinels

I am writing a priority queue using doubly linked list with sentinels class Node { protected Node next; protected Node prev; protected int value; public Node() { } public ...
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0answers
9 views

Form duplication of field, before MySQL posting of data

I have almost managed to fix a long standing problem I've been having with duplicate fields in my website, today I got a very quick solution to make the column data unique. An easy fix that had ...
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0answers
14 views

Arrays Group Counter java

Given a provided array, determine how many groups of a specified size exist. For the array [1,1,1,2,2,2,3,3,3,4,5,6,7] , there are 7 groups with at least one, 3 groups with at least 2, and 3 groups ...
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2answers
14 views

Print first 40 elements in a list ordered by value

I still am not getting the top 40 le t me show you my code: Map<String, Integer> doubleCount= new HashMap<>(); SortedMap<String,Integer> newMap= new TreeMap<>(doubleCount); ...
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0answers
16 views

is my try catch block required?

I have an aspect that intercepts a lot of methods in my code. I was wondering if joinPoint's signature and declaring type can ever be null. If no, then my try...catch is not required. In other words, ...
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0answers
9 views

Java ProcessBuilder not able to run Python script in Java

null from bfr.readLine() however there is no problem if I run the python file directly on terminal by firing: python C:/Machine_Learning/Text_Analysis/Ontology_based.py The last line in my Python ...
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0answers
3 views

Convert javax.mail.Message Email to XML format

I am looking for the open source API if there is any available which can convert javax.mail.Message object to XML specific format or some sample code if there is any already exist ? Please let me ...
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0answers
7 views

Java program trying to find first and last index of word entered

I can not figure out why my program will display the first index of the word the user enters but I can not seem to get the second word to display the right index, also one other question if I would ...
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0answers
7 views

load .odt and parse its text in Java - the long explanation

Regards. Before getting into the problem let me say that I have been at this for weeks. I am making a small text analysis program (word count etc). I have core functionality down but my goal is ...
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votes
1answer
20 views

Passing a String ArrayList to a method returning a double value

I'm working on an assignment question, which im stuck at: i extracted a text file grades.txt to an arraylist called studentgrade i want to then using the grades ive extracted to the arraylist to a ...
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votes
0answers
3 views

Missing quality profile after upgrading from SonarQube 4.1.2 to 4.2

I have just upgraded Sonarqube from 4.1.2 to 4.2. After the upgraded all my quality profile shows only 2 rules. I have not backed up the database so I just need to start from fresh. Where can I ...
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votes
1answer
36 views

Having trouble with this rock paper scissors program

import java.util.*; public class Lab6Part1 { public static void main(String[] args) { String rock, paper, scissors, userchoice = " ", compchoice = " "; int computerInt, ties = 0, wins ...
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1answer
4 views

Difference between Context.openFileInput() and using the Java.IO classes

What is the difference between the Context IO API (openFileInput and openFileOutput) and using Java's IO API on Context.getFilesDir?
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0answers
11 views

GraphicsDevice isFullScreenSupported() = false, now what?

I'm facing the problem, that my Linux machine is returning false, when I check, if fullscreen mode is allowed. Is there a way to bypass this? I currently use a nasty workaround, where I turn of all ...
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0answers
7 views

MGWT: How does MGWT Work with Super Dev Mode on GWT 2.7?

When using MGWT you can use SuperDevMode very easy as it was explained here: http://blog.daniel-kurka.de/2012/07/mgwt-super-dev-mode.html gwt.xml config ist: <add-linker name="xsiframe"/> ...
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0answers
14 views

2d arrays board game-limiting to only move per turn (java)

So in a 2d array of pieces called board that is an 8 x 8 checkers board. Let's say there's a method that returns void called pieceMove which takes parameters of int currentColumn, int currentRow, int ...
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1answer
23 views

How do I make time independent of the FPS?

I have a program which runs the tick() method every frame. I want an object to fall according to a set gravity constant, so I created a Ball object which will update its position to the position on ...
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0answers
11 views

Every Class File from LWJGL has no source

I just installed LWJGL and I selected lwjgl.jar, it loaded all the classes but when i click on one, it just says "This class has no source" Please help!
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0answers
5 views

Error while starting Oracle Weblogic Local Server 11g

Hi I am facing this error while starting my local Oracle Weblogic Server - <Oct 2, 2014 5:07:17 PM PDT> <Critical> <WebLogicServer> <BEA-000386> <Server subsystem failed. ...
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0answers
6 views

design patterns: command, command processor and command (ddd/cqrs)

Need to know the difference between all of these patterns, and what are their origins. All these patterns encapsulate requests into command objects. In command objects that you see in hexagonal/DDD ...
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votes
0answers
8 views

Android - About on licenses available to create and publish an Android Application

I want to know if there are any restrictions on licenses for my application, have thought about having my application under the license Creative Commons. I want to protect my application of ...
1
vote
1answer
15 views

divisors of a number java while loop

I have this Java code that I wrote for an assignment, however I used a for loop, when we were only allowed to use while loops. How would I be able to convert this to a while loop? The intention of ...
1
vote
2answers
17 views

Text file to string matrix java

I am making an auto chat client like Cleverbot for school. I have everything working, but I need a way to make a knowledge base of responses. I was going to make a matrix with all the responses that I ...
2
votes
2answers
16 views

Non recursive floor method for Binary search tree

I have been trying to get this to work but while it works for majority of the input sometimes it gives the wrong output. I have spent some time debugging the code and it seems the problem is when i ...
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0answers
9 views

How do you extend a class using composition which requires a more specialized constructor argument?

I am trying to extend classes using composition where possible. But I am having trouble with a particular problem. Lets say I have a Base class and an Extending class. The Extending class takes in an ...
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0answers
22 views

FractionInterface

I am horrible when it comes to using methods (they confuse me more than anything in java) and I having the issue of trying to complete methods in this java file that my teacher gave us for one of our ...
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3answers
17 views

How to convert a set of Map keys to an Array List

How can I put a collection of my Map's keys as an Array List? I am initializing the map as follows: Map foo = new HashMap<Character,Integer>(); After adding values, I am trying to put my ...
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0answers
9 views

Extracting all Pandora likes [on hold]

I know this is obviously a much larger and more complicated project than one would think but i definitely am going to try and do this whatever it happens to take. I basically want the end product to ...
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0answers
5 views

SVNKit authentication error E170001, but only when checking out and only on one computer

I'm completely stumped by an SVNKit (1.8.5) error that I'm running in to. I'm using the following pattern to build up an Authentication Manager: public static SVNRepository getSvnRepository(String ...
2
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2answers
32 views

java - synchronization block on byte[]

I'm familiar with basic java threading mechanism, however, got confused about one particular case. Below is the sample code. static byte[] syncBuf; // synchronized block of code ...
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0answers
12 views

Server returned HTTP response code: 400 for URL which I suspect is not an URL issue

Please consider my JAVA program(Servlet) below. For some reason, I keep on getting the following error for PUT and POST where as GET works fine with the same HTTP URL ( of course with some minor ...
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votes
0answers
18 views

Java Memory Leak on linux centos

3 hours after the server is opened server are memory overloaded. How can I fix it ? Sorry for bad English. Java profiller; http://i.stack.imgur.com/3qDYb.png
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1answer
14 views

How do I deserialize this string to my POJO representation using Jackson in Java?

public class UpdateRequest { @JsonProperty private String id; @JsonProperty private String type; @JsonProperty private long version; @JsonProperty("fields") private ...
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4answers
32 views

Why we have to mention generic type parameter before the method return type?

Here on this page, it has the below code example to introduce the generic methods? public static <K, V> boolean compare(Pair<K, V> p1, Pair<K, V> p2) { return ...
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votes
1answer
34 views

java function to convert alphanumeric to integers

I'm trying to achieve the below logic in Java but stuck up as I'm a beginner. I need to convert 1A, 1B, 2A, 2B, 3A, 3B...etc to 1,2,3,4,5,6...etc.The logic or the function should return the ...
0
votes
1answer
12 views

Why setBackground method can't set the background of my JPanel?

I am trying to build a simple oval slider program. I gave the window's background color orange, but it's not setting the background as orange, rather a gray background. Moreover the slider can't pass ...
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votes
0answers
17 views

Great books for Java 2D Game Programming?

Hello, I'm searching the net for about a week to find a good book about how to program 2D games in Java. But I only find some 1990's books on it, nothing recent! Grr. I know you are, a lot of us, a ...
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votes
3answers
21 views

Passing object reference as itself to own method explicityly

Question out of curiosity. Can you find any reason to pass object as parameter of its own method explicitly? e.g. someObject.someMethod(someObject); Thanks in advance.
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0answers
28 views

Main method not found and enum expected

Here is an implementation of the Stack data structure: import java.util.ArrayList; public class Stack { private int size; private int maxSize; private final ArrayList<Object> ...
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0answers
11 views

Xms not working

import java.io.*; public class Foo { public static void main(String[] _args) { System.out.println("free:" + Runtime.getRuntime().freeMemory() + ". max:" + ...
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votes
1answer
14 views

Constants representation/design

I need a way of structuring a tree of constants in java. For an API I have:action/request name and for each action a specific number of parameters API_V00 action_1: param_1,param_2 ...; ...
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0answers
6 views

Push Notification not being displayed on a physical phone

I am using parse for my push notification, and the push notification works fine on emulators, but doesn't work on a physical device or a tablet. Below is the code is used into the system: ...
0
votes
1answer
53 views

Algorithm to merge two objects the most efficiently

I have a class Level1 that contains a String and a list of Level2 objects. The Level2 objects each contain a String and a list of Level3 objects. The Level3 objects each contain 2 String attributes, ...

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