I was trying to find the complete readLine() method In the online docs but all I can get hold of Is:
readLine
public String readLine()
throws IOException
Reads a line of text. A line is considered to be terminated by any one of a line feed
('
'), a carriage return ('
'),
or a carriage return followed immediately by a linefeed.
Returns:A String containing the contents of the line, not including any line-termination characters, or null if the end of the stream has been reachedThrows:IOException - If an I/O error occursSee Also:Files.readAllLines(java.nio.file.Path, java.nio.charset.Charset)
Is It possible to view the actual method syntax online ?
I was given the Java code for a project and I am supposed to build unit tests to test the performance of seven sorting algorithms and I am getting the following error in my Lab1Test file...cannot find symbol: method sorta(int[]) location: class Lab1Test.
i'm working on a "name sorter" program and i want it so when i add names and such to the list box i can click sort and it sorts the names in A,B,C format.Here is my code:
I'm using Netbeans FYI and a java desktop application. Also, i have looked everywhere and even my teacher has had to look further into it, i really want to get it to work.
I made a method which takes values from a data set and finds out which one is the highest value. When it finds the highest value, it returns the country which is associated with the value. Here's the data set.
"Country""Total CO2 2005 (million tonnes)""Road CO2 (million tonnes)""Road CO2 per person (tonnes)""Cars per 1000 people" 10 USA5951.131530.35.16777 UK2573.4119.681.99470 Italy476.08116.862592 Germany841.78150.211.82550 Canada553.02123.423.82562 France414.03128.132.04477 Russia1575.44114.690.8178 Japan1254.47224.241.76447 China5100.6228.020.317 India1147.4691.060.18
So if the number was 5951.13 then the program would return USA. How do I do that? I've already started on trying to get this code to work but it doesn't seem to compiler so what's wrong with it?
public static CO2Data highest (CO2Data [] arr2){ Scanner sc = new Scanner(System.in); CO2Data highestindex = arr2[0]; CO2Data currentcountry = arr2[0].getCountry(sc.nextLine());
[Code] ....
Also the array is a CO2Data array which is part of the following class:
public class CO2Data { //The CO2Data class will be called in other methods
private String country; //A private variable will prevent other users from accessing and changing these variables.
private double totalCO2; private double roadCO2; private double CO2PerPerson; private int carsPerPerson; public CO2Data() { country = "";//this sets the initial values for the different variables
I have some work where I have to create a binary tree. Anyway I am stuck on one of the classes which has several methods I must fill in! The code is below
The headers for each method are: public Node find (member p1)The method find(Member p1) is used to return the node which contains a particular member. It is a private method because the interface to CabinetTree should not provide direct access to the internal nodes. It makes use of the method Node findNode (Member p1, Node current)
and the next method is : Node findNode(Member p1, Node current) which searches the tree from current node to find a node whose value is equal to the Member p1, i.e. a node in the tree such that p1.equals(current.getMember()) is true. If there is no such node then the method should return null.
public class CabinetTree { private Node head; CabinetTree(Member p1) { head = new Node(p1, null);
I am writing a palindrome program. I don't understand what is wrong with my Main method. It is giving me error and error is "Can not find symbol in main method"
import java.awt.*; import java.awt.event.*; import javax.swing.*; public class PalindromeA extends JFrame { private JTextField inText; private JTextField outText;
We are required to write a binary‐search method to find an int within an array of ints. Without using any functions besides the basics (for loops, if statements, etc.)
I have this so far:
public int binarySearch(int[] ints, int n) { for(int i = 0; i < ints.length; i++) { if(ints[i] == n) { return ints[i]; } } }
I am wondering if there is something similar to the "Find and Replace" action, that we use in applications like Eclipse and MS Word, that is actually built into the Java API so we can use it in our code, mainly for method names?
For example, right now I have these couple of lines
that does one operation for a side of Rubik's cube. However, all other sides of the cube can use these same exact code with the exception of the 2nd word, ie the position, in each method.
So for example, another side would do something, like, lets say
The reason why I ask this is because this would DRASTICALLY shrink the size my code, rather than have to create separate methods for each operation. Now I know there is a Find and Replace feature for Strings, but I am not sure about method names...
I am trying to understand how package(directory structure) and JAR files work interchangeably. From my understanding JAR is a package file format typically used to aggregate many Java classes. Since many classes are usually contained inside a package, I should be able to create a JAR file from a package, and use them interchangeably. A single JAR file is easier to handle then multiple classes and folders.
To test my understanding of the concept, I am working with the following project structure,
package BookPackage; public class Book{ private String bookname; public Book(String str){ bookname = str; } public String getBookName(){ return bookname; } }
and BookDemo.java contains the following code,
import BookPackage.Book; class BookDemo{ public static void main(String ... args){ Book b = new Book("Lord of the Rings"); System.out.println(b.getBookName()); } }
From the development_directory, I used the following commands to compile and run the project,
...and it compiles and works as expected.Now, I will try to convert the BookPackage folder(package) into single jar file for portability, and I am using the following command to do that,development_directory/ jar -cf bookpkg.jar BookPackage ...this command generates the bookpkg.jar file.
I am going to remove the BookPackage folder to see if bookpkg.jar file really works as a replacement for the BookPackage directory structure.
After removal of BookPackage folder, the development_directory structure looks like this,
i have to write a method, The method receives a parameter of two-dimensional array of integers. The method returns the number of the column which has the lowest sum of the integers.I'm allowed to use only recursion! no loops allowed!-of course i need to make a private method that will sum a column as a single array and then i have to do another private method that compares the column , but it doesn't really work .
This is the code fragment I have for searching my ArrayList. Now, each contact is stored in the ArrayList with five elements (first name, last name, etc.) and they're Strings. The error I get when I try to compile my program lies within this code fragment. It says it cannot find the symbol for the search method. I'm not quite sure what to do with this error.
int foundIndex = SAAddressBook.search(aBook); System.out.println(); if (foundIndex > -1) aBook.get(foundIndex).displayContact(); else { System.out.println("No Entry Found"); }
I know I have a 64 bit OS, my computer, will simply not download the 64 bit version of java when I hit the big ol' red button on the main page. and yes, I have gone to the downloads page and downloaded the one that's 64 bit, but whenever I try to play games, it simply won't let me go online. I have tried uninstalling and reinstalling, but nothing seems to work.
I am trying to build a basic online exam app.But not able to find out how to do that.So user will log in , click on start exam That will be handled by servlet , servlet should call Model class that will fetch questions from database and make a list of those questions and return it to servlet.Than servlet will set that list as an attribute.
and redirect to jsp , which will have three buttons previous ,next ,finish.on clicking on finish I will call servlet wichich will calla model class which returns users score and then servlet redirects to result.jsp.Is this way is right ?
Running a java source code through an online java compiler (in which you will just pass the the source code using a http request, then the compiler will return the output/error of the source code automatically)?.
For a project I have to create an online survey, I cannot use a per-made online survey system because I have really specific needs that no pre-made system can satisfy, so my idea would be to create it in java and store the data in some simple text file, which are fairly easy to work with in java. My question is, is it possible, and if yes how difficult is it, to put the entire thing online? What worries me isn't putting the applet itself online, but the text files that should collect the data, I already have the website to host it.
I want to be able to get an image online and display on my JPanel but for some reason my image wont load and just shows a blank square, but when I try to load an image from my hard drive it works just fine.
I was given some code by a professor to add some features to as part of an assignment. However, the code itself doesn't seem to work.
import java.util.HashSet; import java.util.InputMismatchException; import java.util.PriorityQueue; import java.util.Scanner; import java.util.Set; public class DijkstraPriorityQueue
[Code] ....
The method to find minimum distance is nonfunctional...I receive an error that the types are incompatible. I can't do the assignment if the base code doesn't work to begin with...
I need to make an java app which will be used only for online banking transaction with credit/debit card ...so i need to know the basic procedures for costumer to come and do the transaction
I am building an online quiz. I created a database , bean , controller and jsp. I connected database, wrote query , put resultset in arraylist of object and passed it to jsp. My program runs but arraylist size increases everytime and same question get displayed repeatedly . i cant find the error. Everytime i run the program arraylist size increases. I think it is adding same rows again ang again. here is my code for controller and jsp.
Some web site offers feature of "remember user id/pwd" so next time when you access the same web site, it automatically pre fill out the user id field and or password field for you. How is this kind feature implemented ? I am not talking about the auto-complete function here.
