Type Mismatch For RL Method Which Moves Rows To Left
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]....
View Replies
ADVERTISEMENT
Jun 9, 2014
My GUI class:
import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.JPasswordField;
[Code] ....
Eclipse error message:
Exception in thread "main" java.lang.Error: Unresolved compilation problem:
Type mismatch: cannot convert from void to JTextField
at GUI.<init>(GUI.java:58)
at Apples.main(Apples.java:7)
I copied this from a thenewboston tutorial and he uses an old version of java but im pretty sure ive copied character for character!
View Replies
View Related
Apr 20, 2014
I have a simple doubt
float k = 0;
k+=0.2;
k=k+0.2; // here compilation error
compliation error Type mismatch: cannot convert from double to float
My question is why not a complilation error at k+=0.2;
View Replies
View Related
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..}
View Replies
View Related
Mar 6, 2015
I'm building a pokemon battle simulator, as I mentioned in my previous post, and I'm starting from simplest game form and then adding complexities. right now I'm trying to give my pokemon multiple moves to randomly(for now) choose from. and I started with an int[] array that holds the magnitude of each move. But then it occurred to me that moves need to have multiple attributes like name, type, damage.. etc.. and also they can be acquired by more than one pokemon, and having them as an array would mean literally that I would have to make multiple arrays and it would involve a lot of repetitiveness.
So I settled on Objects, however the first challenge that faced me was, how to introduced the different types of moves? one one hand, I have healing moves,which acts on the pokemon's own health. on the other hand, I have attacking moves,which acts on the other pokemon's health. Given that both types of moves need to be in the same object array, I thought of polymorphism and created a superclass "Moves", which has HealingMoves and FightingMoves as subclasses, so both can be sent to the Moves[]. but since these moves have different effects, I had to make an new if statement that checks for class of move selected and based on that does different things. How the game's logic is going so far? is this the right way to introduce moves?
This is somewhat out of topic, but what is the difference between these two statements:
1-System.out.println(user.moveList[2].getClass().equals(HealingMoves.class)
2-System.out.println(user.moveList[2].equals(HealingMoves.class)
statement two always evaluated to false for some reason...
GameClass
public class OutPut {
static Monster user=new Monster("Me");
static Monster playerOne;
static Monster playerTwo;
static Monster android=new Monster("android");
static Scanner userFeed=new Scanner(System.in);
public static void turnSelection()
[Code] ....
View Replies
View Related
Mar 11, 2014
I am writing a program where i am trying to control a rectangle and determine where it moves, everything is working fine it is moving but i am trying to figure out how to change direction using the "WASD" keys. This is what I have and I am not sure why its not working.
Java Code:
addKeyListener( new KeyAdapter() {
public void keyReleased(KeyEvent event) {
for (MoveableShape creature : creatures) {
if (((Creature)creature).isPlayer()) {
if (event.getKeyCode() == KeyEvent.VK_W) //up
[Code] ....
View Replies
View Related
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?
View Replies
View Related
Feb 11, 2015
I am trying to read contents from a file and display them to the user. However, when I enter the file into the program I get the following error: "exception in thread 'main' java.util.MismatchException. What am i doing wrong?
import java.util.Scanner;
import java.io.*;
public class Project1{
public static void main(String[] args) throws FileNotFoundException {
double balance;
double item1Price;
[code]....
View Replies
View Related
Nov 2, 2014
import java.util.*;
public class CalculatorProjectVincent {
public static void main(String[] args) {
System.out.println("Welcome to this incredibly uneeded and redundant calculator program!");
breaker();
Scanner kb = new Scanner(System.in);
System.out.print("Enter an expression or EXIT to end the program. > ");
[Code] ....
When I run the program and input "v 100", it gives me the following:
----jGRASP exec: java CalculatorProjectVincent
Welcome to this incredibly uneeded and redundant calculator program!
- - - - - - - - - -
Enter an expression or EXIT to end the program. > v 100
Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Scanner.java:909)
at java.util.Scanner.next(Scanner.java:1530)
[Code] ............
View Replies
View Related
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?
View Replies
View Related
Feb 27, 2015
I am trying my code which catches exception when mismatch variable is inputed as i read it with Scanner. It seems right for me but whenever i run it, it keeps leaking memory or something like that
Code :
import java.util.*;
public class Exercise10_1 {
static Scanner scanner = new Scanner(System.in);
public static void main(String[] args) {
boolean exception;
do
[Code] .....
View Replies
View Related
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.
View Replies
View Related
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");
View Replies
View Related
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?
View Replies
View Related
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)
View Replies
View Related
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.
View Replies
View Related
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]...
View Replies
View Related
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?
View Replies
View Related
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?
View Replies
View Related
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)?
View Replies
View Related
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.
View Replies
View Related
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.
View Replies
View Related
Aug 31, 2014
I'm trying to create a cursor for a game that moves square by square. While it will move to the next square, though, it leaves the image of the previous cursor on the last square it was on.
As a visual explanation, this is what the program looks like on launch:
This is what it's suppose to look like after you press the right arrow key once (made by forcibly changing launch coordinates):
And this is what it actually looks like after you press the right arrow key once:
Here is the code for the program:
package cursortest;
import javax.swing.*;
import java.awt.*;
import javax.imageio.*;
import java.io.*;
import java.awt.event.*;
public class CursorTest extends JPanel implements KeyListener{
[Code] ......
I'm fully aware that I could just use g.clearRect on the area and remove it for sure, but I know for a fact I shouldn't have to as I have another program I made a long time ago that tried to do something similar without needing to resort to that.
View Replies
View Related
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] .....
View Replies
View Related
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.
View Replies
View Related
Nov 27, 2014
I have written the following code to calculate tax payments based on income and filing status :
import java.util.Scanner;
public class computeTax {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
// prompt for filing status
System.out.println("enter '0' for single filer,");
[Code] ....
The while loop initiated on line 21 is there so that in case the wrong input is given at the prompt given in line 24, the program outputs "please type the right answer" with the command on line 254 before looping back to line 24 and prompting the user to enter his status number. The program works as long as the input at line 28 is an integer. Not surprisingly if the erroneous input here is not an integer, the program outputs the following error message :
Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Scanner.java:909)
at java.util.Scanner.next(Scanner.java:1530)
at java.util.Scanner.nextInt(Scanner.java:2160)
at java.util.Scanner.nextInt(Scanner.java:2119)
at computeTax.main(computeTax.java:28
To try to solve this I used the Try / Catch technique with the following version of the code :
import java.util.Scanner;
public class computeTax {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
// prompt for filing status
System.out.println("enter '0' for single filer,");
[Code] ....
View Replies
View Related
