119 Topics
 | |
| | I am having trouble implementing a solution using a binary search tree that returns the key of the node based on it's rank in O(N) worst case running time. Every idea i have (listed below) results in O(N^2) or sends me to a dead end. This almost seems impossible. i … |
| | Hello! I have to print patterns using '*' and I am at a loss how to get these patterns printed! I figured out the first one, * ** *** **** ***** ****** ******* ******** ********* ********** and now i have to do it upside down: ********** ********* ******** ******* ****** …  |
 | Is this try catch block enough to ensure the process ran successfully? protected boolean attemptLaunch() { try { System.out.println("Attempting to open '" + name + "'."); //Try to open the Process new ProcessBuilder(path).start(); return true; } catch (IOException e) { System.out.println("Opening failed. Will retry during next Iteration."); return false; } …  |
| | *getting following error. duplicate found Exception in thread "main" java.lang.NullPointerException at binarysearchtree.main(binarysearchtree.java:185) Java Result: 1 here is my code* public class node<T> { public node<T> root ; public T data; public node left; public node right; public node (T newData) { data = newData; left = null; right = null; …  |
| | I am trying to create a File Searching Utility that finds all Files with a given Name which searches all Folders (Sub Directories, and Sub Directories of Sub Directories) in a given Directory. I was thinking of a way to use For Loops, or For Each, but that would mean … |
| | I know you can create nested classed (or just classes declared outside of the class in the same file) but what is the point of doing this? Why not just create a new class file? |
| | Hi, What is the main aim of the callable statement? How it is differ from prepared statement?  |
 | You have been hired by an amusement park company to write a JAVA program that prompts a person to enter their age and height and to find out if they are eligible to ride. A person is eligible to ride if their age is above 9 years and their height … |
| | Critically analyze the following statement "Multiple inheritance can be achieved without interface"? |
| | public class SongIterator<T,L> implements Iterator<Song<T, L>> {} |
| | Create a class called PrintStars. In the main method, use nested-for loops to print 2 diagonal lines of stars accross a 9x9 grid. |
| | I need to create a 2D array that holds the number of family members by the highest numbe of titles of one of the family members, and they input on one line. However, I am having trouble when I call the class in my other code in the main method. … |
| | I'm implementing a generi method that's supposed to traverse a binary tree in PostOrder but when I attempt to use it, the Iterator doesn't work as It should when I attempt to use ot on a Binary Tree, can anyone spot my mistake in the code? Thanks. The method makes … |
 | So I'm teaching myself Java. I'm creating a text based game. I have an if statement that i want to check users input so its like this: if(sc.next() = "help"){ System.out.println("info"); } else if(sc.next() = "item"){ System.out.println("info"); } Etc. But it wont work. What would be the proper way to … |
| | Hello, I'm trying to calculate the maximum and minimum distance between 10 points. My method to calculate the maximum distance is working fine however my method to calculate the minimum is returning 0.0 and I'm not sure why. Could someone please take a look at my code and tell me … |
 | **This is intented for learning purposes, feel free to study the code** Create a drawing that looks like this (pyramid) The number should be incremented with the modulus. |
 | I want to make and If statement which will work when a double "credits" is between 1 and 9. But I'm not sure how to. Will If (1 <= credits => 9) Then Work? |
| | I know I am probably over thinking this but I cannot seem to figure this out. I am trying to check if the value is null and if not to continue. /** * */ public Item getItem(String theItem) { Iterator iter = myItems.iterator(); while(iter.hasNext()) { Item anItem = (Item) iter.next(); …  |
| | Hey everyone, I'm doing a practice problem and I'm stuck. The question is "Given an array a of n numbers (say doubles), consider the problem of computing the average of the first i numbers, for i ranging from 0 to n-1. That is, compute the array b of length n, … |
| | I need help in building a binary tree and putting integers in it. I need to write an add method in my MyArrayBinaryTree class (that extends ArrayBinaryTree) that allows me to place the element to be added in the very next available slot in the array. I also need to … |
| | Hi. Our homework is to use try...catch block in our calculator applet. I don't understand why the "catch" does not work. It will always go straight to the "finally". Here's the code: import java.applet.*; import java.awt.*; import java.awt.event.*; import java.awt.Label; import javax.swing.*; public class clsCalculator extends Applet implements ActionListener { … |
| | I am having trouble getting started with my program. I have writen the array but I am having trouble starting the if statemnent to fill the seats in the program. If they press 1 it needs to fill seats 1 through 5 if they press 2 it needs to fill … |
 | Hi everyone! So, I hereby hope to show that I've made progress in coding java (largely due to the help of this great community). I want to thank everyone for dealing with me (especially James). :) The goal: The code below is supposed to seed a layout of boats into … |
 | Hello All, So I'm working on hand-coding a forum-like website, just for the experience, and I want to have a similar feature as you'll see above where a thread will have its ancestors linked: "Web Development > JSP > Parent traversal of tree-like Structure" I have several beans for different … |
| | I am making a program that does synthetic division, except for it is not showing the quotient only the remainder. I have checked my for loops so many times, and I can't understant what is happening here is my code: import java.util.*; import java.lang.*; class synthetic { static Scanner userInput … |
 | Hi everyone I am having trouble finding the nth node of a binary search tree in an inorder traversal. I am getting NullPointerExceptions for any numbers other than 2 and 3 and even those print out the wrong values. If anyone could help it would be greatly appreciated. The method … |
| | Hi everyone! I am having troubles making the second IF statment execute in my code: Pattern dl_noise_rates_p = Pattern.compile("\\d+\\s(.+)\\s(.+)\\s(.+)\\s(.+)"); Matcher dl_noise_rates_m = dl_noise_rates_p.matcher(lineString2); if(dl_noise_rates_m.find()){ String s_dl_nr1 = (dl_noise_rates_m.group(1)); //checking for non numbers pulled in the regex if(s_dl_nr1 == "NaN"){ //| s_dl_nr1 == "NaN" | s_dl_nr1 == " NaN" System.out.println ("OMGOMGOMGOMGOMGOMGOMGOMGOMG … |
| | Hi Guys, I am working on a binary search tree and I've been stuck on some code for the last couple of days. There are 2 issues that I can't seem to figure out how to fix. 1) I have a file that has a list of names and ID's … |
| | Hello, What is the best way to count the number of swaps required to sort an array that is sorted using the Quicksort algorithm? I put a counter in what I believe is in the correct position and the tests that I have run seem to be correct however Quicksort … |
| | basically i am working on a project for uni, which is to create a form of an abacus model. - peg_array[] stores the number of counters/beads present in each of the pegs(lines) of the abacus. i am trying to use 2 boolean methods: "boolean removeCounter(int thisPeg)" "boolean removeCounter(int thisPeg)" thisPeg … |
| | Hello everybody. Here is my remove method for bst. As you all know, there are 3 cases to consider while removing a node from bst. For the last case, when a node (which is to be removed) has 2 children, I want to use predecessor instead of successor to change … |
| | This code works fine but it would be too long if the score is 50 or over. Is there any way to make it shorter and quicker? I tried to use for loop statement but it didn't work well. background(backgroundChange); if (score >= 5 && score < 10) backgroundChange-=0.8; else … |
| | hey guys , I don't understand why the outPUT is that for the code below.. can someone please explin me how it works. Thank you. class example{ public static void main (String[]args){ int i = 1,j; while (i<=3){ j=i; while(j<=4){ System.out.println(j+" "+i); j=j+2; } i=i+1; } } } HERE IS … |
| | I am trying to switch the below code to sort in descending order rather than ascending. It works when counting upwards, but nothing I try helps with getting it to count starting with the largest number and count downward. public static void insertionSort(Comparable[] list) { for (int index = 1; …  |
| | I am creating a method to multiply 2 polynomial expressions together such that: `3x^5 * 2x^3 = 6x^8` -> Where the coefficients are multiplied and the exponents are added together. My test case for this would look something like the following @Test public void times01() throws TError { assertEquals(Term.Zero, Term.Zero.times(Term.Zero)); … |
| | I am trying to input an int into the end of a singly linked list. I have already created the code to put a number at the end of the list but when I go to print it out, it only prints out (in my test class) the int that … |
| | My assignment is to randomly generate a password based on the selection chosen by the user. So far, my code is unfinished but that's because I've run into a problem. For the second selection(Lowercase and uppercase letters). My password will display lowercase and uppercase letters but it won't be enough … |
| | Hi there i am trying to write a java code that will essentially be like a gps but a lot simplier and i need to make a mini map about 4 by 3. where Dunada and Government is the first intersection and i have already done so by using multiple … |
| | public void inOrderTraversal(TreeNode node) { if(node == null) { return; } inOrderTraversal(node.getLeft()); System.out.print(node.getKey() + " "); inOrderTraversal(node.getRight()); } I wrote this code for going through a binary search tree and printing out the items in order from low to high. it works just fine but i need to get it … |
| | Dear all, I have stuck with one problem. I have taken one Hashmap, Performing some input operation,remove operation on it. So after performing remove operation, i want value of 2 successive key in two different array. Also i want to match 1st key's value with all other keys' value. Like … |
| | Hello I am trying to run a perl script on tomcat server. I am putting the incoming http request in a variable data which collects the headers as well as the text file attachment data. The code is like this : .... while(<>){ $data = $data . $_ ; } … |
| | Hey guys, I'm trying to create a iterative heapsort program and for some reason when I input 10 random numbers into the array, only 9 numbers are sorted. Here is an example of my input/output: Input: 45 15 2 44 30 83 30 86 66 49 // 10 random numbers … |
| | While lunching the application in TOMCAT 5.5 and JDK 1.5 I am getting below exception could some help me in resolving the issue Jul 25, 2012 4:12:50 AM org.apache.catalina.core.ApplicationDispatcher invoke SEVERE: Servlet.service() for servlet jsp threw exception java.lang.NoSuchMethodError: javax.servlet.jsp.tagext.TagAttributeInfo.<init>(Ljava/lang/String;ZLjava/lang/String;ZZ)V at org.apache.jasper.compiler.TagLibraryInfoImpl.createAttribute(TagLibraryInfoImpl.java:572) at org.apache.jasper.compiler.TagLibraryInfoImpl.createTagInfo(TagLibraryInfoImpl.java:401) at org.apache.jasper.compiler.TagLibraryInfoImpl.parseTLD(TagLibraryInfoImpl.java:248) at org.apache.jasper.compiler.TagLibraryInfoImpl.<init>(TagLibraryInfoImpl.java:162) at org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:418) at …  |
| | Hi, If I have a value inside the try{} how can I read it outside, is it possible try { int num=0; } |
| | Good day to every one. First here is my code so far import java.io.*; public class Program2 { public static void main (String[]args) throws IOException{ BufferedReader bv = new BufferedReader (new InputStreamReader(System.in)); String a, b, c, x; Float d, e, f, g, h, i, j, k, l, m, ave; System.out.println("ENTER … |
| | Good day to everyone.. First Here is my code so far.. import java.io.*; public class Inventory { public static void main (String[]args)throws IOException{ BufferedReader bv = new BufferedReader (new InputStreamReader(System.in)); String x, z; boolean y = true; int a, b, c, d = 0; do { System.out.println("--------------------------------------------------------------"); System.out.println(" M I … |
| | HI Could yu please tell me how to get previous values from current iteration in the below example : public void parseDtoCollection(Collection dtos) contains list of dtos in private AssetClassVersion createNewAssetClassVersion(AssetDTO dto) method i am iterating but i want to get to get previous itearation values in current iteration if … |
| | I am hoping this is an easy question. I am not well versed in Java, I am a ITSM admin, but the ITSM product we use comes with Tomcat as it's web server. I am trying to find out if there is a simple way to set index file (welcome … |
| | If I have an arraylist of arrays (each item in the arraylist is itself a one-dimensional array), how can I iterate over each element of each array contained in the arraylist? |
| | i have to do a pyramid with a pattern like this [iCODE] 1 1 2 1 1 2 4 2 1 1 2 4 16 4 2 1[/iCODE] i just realized dani web didnt take my center pyrmaid thing it moved to the side no matter what spacing i did … |
The End.