Method Is Undefined For The Type
May 26, 2015
I have a problem with my code with Junit:
"The method infinityNorm(double[) is undefined for the Type Vektor."
This error pops up for both the euclidian norm and the manhattan norm.
Here is the code:
package de.ostfalia.gdp.ss15;
public class Vektor {
public static void main(String[] args) {
double[] array = {1, 2, 3, 4, 5, 6, 7, 8, 9};
System.out.println("Euclidian Norm: " + euclidianNorm(array));
System.out.println("Manhattan Norm: " + manhattanNorm(array));
euclidianNorm(array);
[code]...
What is the problem here?
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Sep 17, 2014
Am doing mapreduce in java for hadoop. The below code is for Reducer. i get a problem with the TryParseint. What is this error and how to rectify it?
Error : The method TryParseInt(String) is undefined for the type MaxPubYearReducer
import java.io.IOException;
import java.util.*;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.conf.*;
import org.apache.hadoop.io.*;
[Code] ....
Attached image(s)
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Jan 16, 2014
Is there a reason why this error is occurring? I can't identify what's causing it to happen.
Java Code:
package tictac1;
import java.util.*;
public class TicTacToe{
//Instance variables
private char[][] board; //2D array of chars for the board
public TicTacToe(){ //creates a board where each space holds whitespace
board = new char[3][3];
for (int row = 0; row < 3; row ++){
[code]...
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Dec 2, 2014
Let's say we have situation like this:
abstract class A
class B extends A
class C extends B
class D extends C implements SomeInterface
I'm trying to implement a method "doSomething" declared in SomeInterface in class D. While trying to call doSomething in main I get the error message ”The method doSomething is undefined for the type B”
This is my code i main:
B container = new D("1,2,3,4,5,6,7,8");
System.out.println(container.doSomething());
I need container to be an object of type B, because it goes later into a list of type B. According to what I've been told, the only file I need to edit to make this work is class D.
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Jul 29, 2014
I am trying to run a class with a client code and I get the following error
The method add(TimeSpan) is undefined for the type TEST
Why i get this error?
package timespan;
// Represents a time span of hours and minutes elapsed.
// Class invariant: minutes < 60
public class TimeSpan {
private int hours;
private int minutes;
[Code] ....
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Oct 30, 2014
When I run my code, I get an error with this line
if(Collections.binsearch(dict, word3) != -1) {
I imported the collections utility and everything. Tell me if you need to see more of the code. The exact error is binsearch is undefined for the type Collections.
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Dec 25, 2014
I need to write a method that will consume string representation of Object type and will return one object of this type. How to set return type for the method in this case?
Here is exmaple :
public <?> identifyType(String typeString){
if (typesString.matches("String")){
return new String("");
}else if (typeString.matches("Integer")){
return new Integer(0);
}
//....etc..}
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May 21, 2015
I stumbled upon a method that im not sure how to handle (yet).Below the code:
public DateTime() {
this.day = day(milliseconds);
this.month = month(milliseconds);
this.year = year(milliseconds);
this.hour = hour(milliseconds);
this.minute = minute(milliseconds);
[code]...
The two last methods stumped me. The return type to each is "DateTime", according to JUnit complaints.I know that I can use the "this" keyword to reference to the object. But how do I get these two methods to return the correct result?
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Sep 13, 2014
I'm writing a code to record Student names and their scores but I don't understand why it says that nextString is undefined. What does that mean? I haven't written much of the code but here is what I have so far
import java.util.Scanner;
public class highScores {
public static void main(String[] args){
Scanner input = new Scanner (System.in);
System.out.print ("Enter number of students: ");
[code]...
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Nov 13, 2014
I've a simple logic Code to increment a variable from javascript and Send it back to jsp. I just writing simple code to explain the logic. My code will have scritplets. I know usage of scriptlets is inside jsp is oldest but for the sake of logic.
<!--Jsp Page -->
<%
int i=0;
<input type="button" onclick="fun()"/>
%>
<!-- Script as Follows-->
<script>
function fun(){
<%i++;5>
}
</script>
But My value of i is not incrementing its showing that function is undefined
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Jul 31, 2014
I have the following method:
public static void doSomething(List<? extends GenericClass> input)
{
// op
}
^
This compiles and works, ensuring I can only pass in a List of a type extending GenericClass.But now I want it to accept an Array instead of List. This is where I'm stuck:
public static void doSomething(<? extends GenericClass>[] input)
{
// op
}
^
A wrong guess at the syntax which does not compile. One solution is to convert Array into ArrayList before calling the 1st method above, but I'd rather bypass this if possible.
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Jun 4, 2014
I am using Oracle Java 8 in Eclipse working on both Ubuntu and OSX. I have this code:
Java Code:
private static String getConfigDir(){
Path configDir = Paths.get(homeDir(), homeConfig(), appName());
return configDir.toString();
[code]...
But for the method get() of Paths, I get this error in eclipse.The method get(String, String[]) in the type Paths is not applicable for the argument..Yet on the Oracle documentation site, it uses a similar example:
Path p5 = Paths.get(System.getProperty("user.home"),"logs", "foo.log");
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Nov 25, 2014
Following is the warning on using readLine().
The method readLine from the type DataInputStream is Deprecated.
An additional line suggestion is added by eclipse and that is
@SupressWarnings("deprecation") ;
Can delineate this?
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Feb 20, 2014
So I want to know how in Java you can pass a unkown type into a method (type can be an int, double, or a user defined object) and return that unkown type.
example of what I want:
Java Code:
public (unknowntype)[] method2 ((unknowntype)[])
//Process Data
//unknowntype.process();
return (unknowntype);
} mh_sh_highlight_all('java');
I know in C you can use void pointers and in c++ we have templates but I do not know how java handles this. Also I want to know if it is possible to call a method in the unknowntype.
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Feb 7, 2015
why Java does not support return type in method overloading. I coded following and it compiles and runs without any errors.
class Ideone
{
public static void main (String[] args) {
sum(3,5);
[code]....
If Java did not support overloading based on return type, this program should not work, right?
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Jul 14, 2014
I am following this article [URL] .... till now I have made some code
This is my Interface
public interface Comparable<T> {
public int compareTo(T o);
}
And this is my class where I am using Bound Type Parameter on Generic Methods
public class GenericMethodBoundType {
public static <T extends Comparable<T>> int countGreaterThan(T[] anArray, T elem) {
int count = 0;
for (T e : anArray)
[Code] .....
What else I need to do both in main method and at what parameterized types I need to pass at the class?
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Feb 19, 2014
how to get an access to the method with a parameter of class type variable, lets say: public void insert(Record newRecord, int pos)?
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Aug 9, 2014
Essentially, the code I want is:
public void randomCreate(ParentObject obj){
int x = random(0-4); //pseudo
int y = random(0-4); //pseudo
create new ParentObj(x,y);
}
ParentObject is actually abstract, so you would only ever pass one of its children objects to it, and a child object of that type would be created. It seems like there should be a way to pass a type, rather than an object, and then create an instance later down, but I don't know if that is actually possible, or if it is poor programming style.
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Feb 16, 2014
I'm trying to make a puzzle that gets the user input and moves the rows either to the left or right, the columns move either up or down depending on what the user wants. The problem I'm getting is a type mismatch for my RL method which moves the rows to the left.
import java.util.*;
import java.io.*;
public class Numbrosia {
static int [][] board = new int [5][5];
public static void main(String[]args){
Scanner scan = null;
try{
[code]....
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Jun 25, 2014
I am new to Java and trying to learn it.I wrote the following program but while creating the method nav i am getting errors.
Error:- void is an invalid type for the variable nav
import org.openqa.selenium.*;
import org.openqa.selenium.firefox.FirefoxDriver;
import java.util.*;
public class YahooHomepage {
private static WebDriver driver;
[Code] .....
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Sep 12, 2014
I am trying to make a ChessBoard class composed of an array of JLabels inside a JPanel with a grid layout. I am also trying to override the getPreferredSize method so that the board will change size when I resize the main window (in another class in which I will instancize this class as part of a larger GUI). I got this kind of layout working before, but now I am trying to get it to work with multiple classes. However, after copying in the part of the previous code corresponding to the panel's layout, I am encountering some errors that I don't know how to solve. Specifically, when I try to override the getPreferredSize method, the compiler tells me "method does not override or implement a method from a super type, " and that it can't find the method "getPreferredSize"
Here's my code:
public class ChessBoard extends JPanel//the panel that this class extends is the boardHousing
{
//mental chess board piece array
Piece mentalBoard[][] = new Piece[8][8];
//actual GUI chessboard JLabel Array
static JLabel chessBoard[][] = new JLabel[8][8];
[Code] ....
I would just think that I was overriding the method incorrectly, but the weird thing is that I got that specific section of code to work before -- the only thing different now is that there are multiple classes, so my ChessBoard class itself is extending JPanel.
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Jan 16, 2015
I am trying to implement the following example to override the equality and hashCode method if the class has reference type member. I do get the expected result "true" for equal and "false" for non-equal objects. But the print statement in the Circle's equal method is not executed when the objects values are not equal. I don't know what i am missing, though i get the equality result "false" as expected for non equal objects.
class Point{
private int x, y;
Point (int x, int y) {
this.x =x;
this.y = y;
[code]....
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Oct 18, 2014
I've just been having a go at an exercise where I have to create and use a class called Point, with two fields of type double. I have to create some methods for it, one of which is a distanceTo(Point) method, that calculates the distance to another point. I've tried to keep the distanceTo(Point) method short so have created some other methods to use within the method. My question is about the getDistance() method that I've made. As you can see below, I've given it two parameters, which are references to values within two Point objects (this.x and otherPoint.x).
double distanceTo(Point otherPoint) {
double distanceX = getDistance(this.x, otherPoint.x);
double distanceY = getDistance(this.y, otherPoint.y);
return calculateLength(distanceX, distanceY);
}
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Oct 27, 2014
This code is directly from Swing: I'm using Eclipse and keep getting an error on line 10 saying :
"The type JTextField must implement the inherited abstract method ActionListener.actionPerformed(ActionEvent)."
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
[Code] ......
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Oct 13, 2014
I am having a little trouble with a part of my Java assignment that needs to have linked lists in it.
I need to write a public method that takes an array of type object to load strings into a linked list.
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Mar 26, 2015
This is my code inside the method:
@Post
public static String getDetails(Representation entity) throws Exception {
String customerId = getQuery().getValues("cus_id");
}
I use this code in Restlet Representation. I try to get the value from the Request API. But I am facing the problem as "Cannot make a static reference to the non-static method getQuery() from the type Resource".
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