I was given the assignment to make script so that is will fill an array with random numbers using "recyclable" parts.
So my script is:
import java.util.*;
class eser_ha_dibrot_4 {
public static void main(String[] args) {
int []a=new int[10];
fill(a);
[Code] ....
And I get this error: "random cannot be resolved or is not a field"
what to do?
I've been using Eclipse and I realized that it compiles stuff into class files for you. So, I created a new project and each class is a separate .java file, with the .class files already there, but I cannot get rid of these errors. Or, say if I wrote them all into one file and then realized it needs to be 3 separate, or that all need to be in the same src file (oops)? Here are the errors:
Exception in thread "main" java.lang.Error: Unresolved compilation problems:
random cannot be resolved or is not a field
guessp1 cannot be resolved to a variable
guessp1 cannot be resolved to a variable
guessp2 cannot be resolved to a variable
guessp2 cannot be resolved to a variable
guessp3 cannot be resolved to a variable
guessp3 cannot be resolved to a variable
guessp1 cannot be resolved to a variable
guessp2 cannot be resolved to a variable
guessp3 cannot be resolved to a variable
[code]....
In my application, some text should be added to a text area in response to a click on a button. So as an action listener to this class, I made another class which implements the ActionListener.
Inside this class, I have obtained the text which I want to be added to the text area. But the text area is in another class and for the action listener I wrote another class.
Now the problem is that when I try to add the text to the text area by the following line of code, it says that textArea_1 can not be resolved or is not a field.
Java Code:
ParentPanel.textArea_1.setText("Name:"+ncrarray[0]+"
Code:"+ncrarray[1]+"
Rank:"+ncrarray[2]); mh_sh_highlight_all('java'); What should I do about it?
Even if I try to write a method like the following in the class in which the text area is created, it gives the same error.
Java Code:
public void printTextArea(String text) {
textArea_1.setText(text);
} mh_sh_highlight_all('java');
The text area is present inside a constructor of the class. I am writing the method outside the constructor (ofcourse).
The program I'm supposed to create generates a random number between one to ten. Then the program is to ask me if I wish to cross the road. If you choose to cross, the outcomes for 0-2 are "You crossed safely." For 3-5, 75% of the time it should say "RIP you got run over", and 35% of the time it should say "You crossed the street." For 6-8, 60% of the time it should say you made it.", and 40% of the time it should say "You died". For 9-10, it should say "RIP".
So far I have gotten the random number generation part working. I have up to here:
import java.util.Random;
public class test4 {
public static void main(String[] args) {
Random random = new Random();
for(int i =0; i < 1; i++){
int num = random.nextInt(10) + 1;
System.out.println("The number of cars on the street are: " + num + "Do you wish to cross the road?");
}
}
}
I Can't run this simple program
import java.util.Scanner;
import javax.swing.JOptionpane;
public class Project {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
[code]...
This is the Error that i get in console!"Exception in thread "main" java.lang.Error: Unresolved compilation problem: JOptionPane cannot be resolved at Project.main(Project.java:10)"
I am trying to read a file that will be contained within the Jar. I have created a source folder in eclipse and put the file in there. The examples I can find online to do this are not working out for me. I am getting an error that getClass cannot be resolved.
Java Code:
private static void help() {
version();
try {
InputStreamReader is = getClass.getClassLoader().getResourceAsStream("data/cmdhelp");
int c;
do {
c = is.read();
System.out.print((char) c);
} while (c > -1);
System.out.println();
} catch (IOException e) {
System.out.println("JAR file has not been packaged correctly.");
}
} mh_sh_highlight_all('java');
The error from eclipse:
getClass cannot be resolvedCommand.java/accface/src/frontendline 29Java Problem
I found some code online to draw a pink heart.. sort of a valentine's day heart.. I would like to add to it and customize it some... But I can't get it to work as-is.. I get a compile error that "StdDraw Cannot be resolved" ...
Here is the code..
import java.awt.color.*;
import java.awt.Graphics;
import javax.swing.JPanel;
public class Heart {
public static void main(String[] args) {
StdDraw.setXscale(-1.5, +1.5);
[Code] .....
Here is my current code. The CustomerName in the System.out.print statement doesn't compile - it says that CustomerName can not be resolved to a variable. But why is that true? it is declared and assigned a value in the for loop.
Query query = em.createQuery("select CustomerName from web_cost_file,customer " +
"where web_cost_file.customer=customer.id and web_cost_file.customer=" +
costsFileList[0]);
List<Object[]> listCustomerName = query.getResultList();
for (Object[] result : listCustomerName) {
String CustomerName = result[0].toString();
}
System.out.print(CustomerName);
I am trying to use a custom class in a .jsp page, as part of a course I am taking on Web Technologies.The original version of the jsp page was working fine, until I moved part of the Java code to a separate class.Here is the original .jsp code that is working:
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" lang="en-GB" xml:lang="en-GB">
<%@page pageEncoding="utf-8" %>
<head>
<meta charset="UTF-8" />
<title>Forum</title>
<link rel="stylesheet" type="text/css" href="stocktails.css" />
</head>
<body>
[code]....
I am getting an error stating that 'word cannot be resolved to a variable' pointing to my return value. Why? Should I make a default String value for word before my while loop or something, like
String word = " ";
?
String getItRight(){//make sure the user enters the password correctly
Scanner input = new Scanner(System.in);
boolean repeating = true;
while(repeating){
[Code] ....
I'm not sure why I'm getting these errors. They only begin to happen after the second if statement, and the subsequent if statements are formatted exactly the same.
The errors are marked by the comments in the code.
Java Code:
import java.util.*;
import java.io.*;
public class GazillionSongs {
public static void main(String[] args) throws FileNotFoundException {
System.out.println("Welcome to Java Song Collection!");
System.out
.println("This program sorts and filters large databases of popular songs.");
[Code] .....
The error "cannot resolve to a variable". I get the error I just can't seem to fix the error.Presently I am working my way through the Oracle docs and that seems ok. Java for Dummies, Sams teach Yourself Java in 21 Days, plus my favorite Head First Java.
package tutorial;
import java.util.*;
public class HolidaySked {
BitSet sked;
public HolidaySked(){
sked = new BitSet (365);
int [] holiday = {1,15,50,148,185,246,281,
316,326,359};
for (int i = 0; i<holiday.length; i++){
addHoliday(holiday[i]);
[code]....
Now I am working with tomcat6.0.16 and oracle10g.
<%@page import="java.sql.*" %>
<%
//Register the drivers
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
//Establish connection with the database
Connection con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe","system","manager");
[Code] ....
This is my program...then I am getting following error.
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Unable to compile class for JSP:
[Code] ....
I've created a constructor in bean and put an value to my string after doing so all started to work properly. I am trying to get my application to work but no luck so far. I have looked for similar issues but although there were similar I've got no luck in fixing mine.
When I am trying to put an value in the input file i got error message (/zadanie_1.xhtml @15,75 value="#{z_1.lancuch}": Target Unreachable, identifier 'z_1' resolved to null).
My starting page:
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://xmlns.jcp.org/jsf/html">
[Code]......
I am getting the error message as Exception in thread "main" java.lang.Error: Unresolved compilation problems: NewExcel cannot be resolved to a type for the line NewExcel test = new NewExcel(); in the below code to read the columns from an excelsheet "test.xls". Why I am getting the error message :-
import java.io.File;
import java.io.IOException;
import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
public class ReadExcel
[Code] .....
I am trying to implement the JSF 2.0 project with Primefaces from one of the tutorial, i con login with only jsf but not when i use primeface where i am getting following error.
Error Log
HTTP Status 500 - /login2.xhtml @23,98 value="#{employee.userName}": Target Unreachable, identifier 'employee' resolved to null type Exception report
message /login2.xhtml @23,98 value="#{employee.userName}": Target Unreachable, identifier 'employee' resolved to null description The server encountered an internal error that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: /login2.xhtml @23,98 value="#{employee.userName}": Target Unreachable, identifier 'employee' resolved to null
javax.faces.webapp.FacesServlet.service(FacesServlet.java:321)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)root cause
[Code] ....
Note The full stack trace of the root cause is available in the Apache Tomcat/7.0.57 logs. in Apache Tomcat/7.0.57
Employee.java
package com.login.sample;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.annotation.PostConstruct;
[Code] ....
I am trying to create a login page with a database in which i am getting this error. I am not getting this bean properties.
I use SceneBuilder2.0 with JavaFX8 on OSX 10.9.4
When i use a stylesheet in SceneBuilder2.0 which uses a color-lookup the lookup fails with:
WARNING: Could not resolve 'abc' while resolving lookups for '-fx-background-color' from rule '*.button' in stylesheet supersimple.css
The color-definition is in the root-rule, so it should be found.
The lookup does work fine at Runtime.
There is a more complete description of the problem on stackoverflow:
javafx - SceneBuilder2.0 does apply rules with color-lookup - Stack Overflow
What I'm trying to do here is to count the vowels in an arraylist of strings. What I did may not be right, but that's not my problem for now. My problem is that i cannot return the value (n) I want to return. I don't know why.
import java.util.*;
import java.util.Arrays;
public class One {
public static void main(String[] args) {
ArrayList<String> list = new ArrayList<String>();
list.add("aaa");
list.add("brr");
list.add("unn");
System.out.println(vowels(list));
[URL] ....
I've come across a piece of code and I am totally baffled by how a certain field is being incremented.
public class Foo{
private static int counter;
private final int id = counter++;
public int id(){return id;}
[Code] ....
Now. The output for this is:
0
1
2
3
4
I understand all the code in it quite well. It's all basic. Containers, generics, looping, foreach loop. What I DON'T understand though is how on each iteration of the foreach loop, the call to the method id() returns an incremented number. I am assuming it has something to do with the field "counter" in class Foo being static because when I made it non-static it didn't increment. I must have missed something way back when I started learning Java because I just don't get it.
The id() method only returns the value of the id field in class Foo and that is the value of counter++. counter is not initialized, though I'm guessing it gets the default 0 when the Foo() constructor is run? Or do statics get initialized BEFORE the constructor is even run? Anyway. How does calling the id() method cause an incrementation? I'd understand if there was some code that tracked the number of Foo objects being created and incrementing for each one, but I cannot see how each time the id() method is called it returns an incremented value.
I have a jsf page.i need to confirm one filed only contain double value.how to validate this? I checked and found there is a validateDoubleRange,but its not suitable for this.
View Replies View Relatedi need to develop a java program in which it will ask the user "Username" and "Password" and by which it will login to a wesite.
I have developed a GUI in which the username should be entered in the User "JTextfield" and Password in Password "JPasswordField". I need to make sure that password should not be displayed in the GUI. but I didnt find a way to parse the string (char) entered in the "JPasswordField" to the website.
It is always passing a 'null' character! I tried to search in internet and i found that it wont be able to pass the passwordfield characters but you will be able to check in the main function itself by comparing with another char array in the main program itself whether the password entered is correct or not.
Is there any alternate way for this?
Objective : Parse the password (which is not displayed in the GUI) to a website or some other function where it will use it
I have a PDF file and I have a text file that contains this data. It has the name of a PDF field along with a database table column name.
Text file: pdfFieldEmployee=Employee; pdfFieldStartDate=StartDate; pdfFieldSalary=Salary; pdfFieldExempt=Exempt
I also have this hash map that contains the database table column names along with their corresponding values:
Employee, Don Parker
StartDate, 5/6/2000
Salary, $55000
Exempt, N
How would I read through the text file and the hash map and at the same time do this:
if the pdf field is equal to pdfFieldEmployee, then set pdfFieldEmployee equal to Don Parker.
if the pdf field is equal to pdfFieldStartDate, then set pdfFieldStartDate equal to 5/6/2000.
and so on and so on. I would prefer to do this with a loop because I think it would take less code than writing a bunch of if statements.
How to fix the error with the line:
Account account1 = new account(1122, 20000.00);
import java.util.Date;
public class AccountClass {
class Account {
private int id;
private double balance;
private double annualInterestRate;
[Code] ....
I forgot to mention, the error says "account cannot be resolved to a type"
I have a question about JTextArea colors. When i set the color to blue and then write something on the JTextArea (JTextArea.append) and then set it back to black everything will be black. How can i solve that? Like in Notepad++ or Eclipse when you write keywords in a JTextArea (where you write your code) only some words change color.
This is my code:
// All the imports
public class whatever extends JFrame {
JTextArea a = new JTextArea();
public whatever() {
super("Title");
add(a);
[code]...
I need to fill up 1/10th of the board with mines but i am only able to successfully put 1! also my goal is not showing up on the game even though i put it as an up arrow.
package Homework4;
import java.util.Random;
import java.util.Scanner;
public class HW4 {
//Creates a new type to be used to create the board
[Code] ......
we have an Arraylist<Tweet>, and this class is defined as followe: public class Tweet implements Comparable<Tweet>, Serializable. now if we implement the method comparteTo, then will it be sorted automatically? I want to sort this array by any insert.
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