Dynamic Enum - How To Make DIME(10) False
Apr 20, 2015
I wrote a simple enum and a test class. The enum represents us coins and my test class uses the enum to calculate the change with the least number of coins. For example, I pass in 95 cents, I get back 3 quarters, 2 dimes. It all works just fine, easy to implement and I see why I should use an enum. Then I thought, what if the person is out of dimes. How could I tell the enum to skip dimes in it's switch statements? How would I make DIME(10) false?
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Jan 28, 2014
I'm trying to create a program that has two labels... one in the top left and one in the top right... so far when i run it only the one in the top right (label2) shows... also In the program there will be multiple button and when I click a button it will show a different panel and then i can go back to the first panel to select other panels... so far i haven't figured out how to make panels visibility go false/true with actionlistener. last thing... when i have more then one panel added to the frame none of them show up.
Java Code:
//Matthew
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Test{
public static void main(String[] args){
[code]...
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Apr 16, 2015
Suppose I have a class child
public class child{
public static int age = 1;
}
And I am using class child static variable age in class school
public class school{
int var_age;
public school(){ //school constructor
var_age = child.age;
}
}
Value in age of child class could be any of these below depending on some logic:
public static int age = 1;
public static int age = 2;
How could i achieve this where should i apply that logic? Also it is mandatory for class school code to remain same.
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Jan 12, 2015
I want to have a priceObject which is constructed by a price the enumtype and the name.
public class Testing {
public static void main(String[] args) {
PreisObject p1 = new PreisObject(1,Price.liquid,"TEST1");
System.out.println(p1);
PreisObject p2 = new PreisObject(2,Price('f'),"Test2");
[Code] .....
As you can see with PreisObject2 I want to check the enum by the value and not by the name as in PreisObject1.
Or do I have to use a if-else or switch statement to do something like this?
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Feb 10, 2015
Here I have an enum class
public enum Money{
ONE_PENNY(1),
TWO_PENCE(2),
FIVE_PENCE(5),
TEN_PENCE(10),
TWENTY_PENCE(20),
FIFTY_PENCE(50),
ONE_POUND(100),
TWO_POUNDS(200);
private int coin;
Money(int c) {
coin = c;
}
int showCoin() {
return coin;
}
and for a test class, I need an array list with a couple of coins in it (i.e. ONE_POUND, TWO_POUNDS) and a loop that adds together the values of the coins in the list and prints the result. How can I do this?
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Dec 4, 2014
I'm developing a JSF application.I have some enums, for example
public enum Gender {
MALE("Male"),
FEMALE("Female");
private final String label
[code]....
I want to put the enum value in <h:selectOneMenu>. I use a bean:
@Named(value = "genderBean")
@RequestScoped
public class GenderBean {
/**
* Creates a new instance of GenderBean
*/
public GenderBean() {
[code]...
How can i call the method .values() of enum for a generic enum T, like in the striked code?
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Sep 16, 2014
Is there anyway to iterate an enum type without an instance. As some context, consider the following code:
Java Code: public interface GenericChecker
{
public bool isValid(String str);
} mh_sh_highlight_all('java'); Java Code: public class EnumChecker<T extends Enum<T> > extends GenericChecker
{
private Class<T> enumType; //No instance
[code]....
toString method of the enum types has been overridden so that it returns the name assigned to the enum rather than the enum name itself. For example an enum might be SOME_ENUM("Assigned name"), therefore toString returns "Assigned name" rather than "SOME_ENUM". The idea is that a field from a table can be handed to the isValid(String) function on the GenericChecker base, and the derived class will then check to see if the field matches valid data as far as it is concerned.Thus, I can create a whole bunch of checkers easliy:
Java Code: GenericChecker checker1 = EnumChecker<EnumType1>();
GenericChecker checker2 = EnumChecker<EnumType2>();
GenericChecker checker3 = EnumChecker<EnumType3>();
GenericChecker checker4 = SomeOtherChecker(); mh_sh_highlight_all('java');
The problem is, if I use the EnumChecker then the expression "enumType.getEnumConstants()" in the isValid function blows up because enumType is null.
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Mar 17, 2014
Attempting to write a custom comparator for sorting songs, but I keep getting errors saying that the types cannot be resolved.
Java Code:
import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import java.util.*;
public class SongCollection {
[Code] .....
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Nov 9, 2014
How would I go about and make an enum, that has Strings and Methods?I want to make a class called GraphicalEffects, this class and be instanstiated and it has a method to apply graphicalEffects AS methods or some type of references to methods in an ArrayList.
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Nov 21, 2014
What class does method Planet.values() in the code below belong to? I thought it belongs to java.lang.Enum but when I could not see it in Java API 7.
package enumeration;
public class EnumTest {
public static void main(String[] args) {
//Planet myPlanet = Planet.EARTH;
// Check arguments supplied
if (args.length != 1) {
System.err.println("Usage: java EnumTest <earth_weight>");
System.exit(-1);
[code]....
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Jul 11, 2014
So I have an Enum file with 119 constants and each constant of that type has 20 fields that come with it. All the fields are the same type and named the same (e.g. there are 119 of Object obj, one for each constant), and I want to run the same methods over them. Since the Objects of the same type are named the same for each constant, I just have them named explicitly in get-er methods.
This worked fine when I just put all 20 fields through the constructor and set them as fields under all the constants. But I realized that if I wanted to make an instance of this Enum class, I'd have to enter in all 20 fields when they are all a set of Objects with unique values. So I then put them as fields under their own respective constant to make it easier to create instances of this enum. But now my methods don't work.
A) I don't really understand why they don't work anymore?
B) Is there a way to fix it without putting all the methods under each constant?
Example:
public enum MyEnum {
AAA {
private MyObject obj = new MyObject (3.0);
},
BBB {
private MyObject obj = new MyObject (1.5);
},
CCC {
private MyObject obj = new MyObject (6.5);
},
DDD {
private MyObject obj = new MyObject (3.5);
};
public double getObjVal() {
return obj.value(); // it can't find this obj should I move it up to where the constants are declared?
}
}
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Oct 6, 2014
I have a set of enum values (let's call then ONE, TWO, THREE.....). I want to find the larger of two of them. But max(ONE,THREE) gives a compile error as MAX isn't defined for type-safe enums. Fair enough.
I also agree that one shouldn't be able to use arithmetic functions on enums.
But as Enum implements Comparable, one can write a function which implements max and min, rather inefficiently I assume.
Is there a better way of getting the max/min of an enum? And if not, can the Java team be persuaded to implement it?
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Jul 7, 2014
My goal is to ask them for their name and if they got it right then it says yes while if they wrote it wrong, it would say no.
Java Code: public static void main(String[] args) {
Scanner name = new Scanner(System.in);
System.out.println("What is your name?");
String sname = name.nextLine();
name.close();
System.out.println("Are you sure it's " + sname + "?");
Scanner tfname = new Scanner(System.in);
String stfname = tfname.next();
[code]....
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Aug 7, 2014
import java.io.*;
class addition {
public static void main(String[] args) {
int num1,num2,sum;
try {
DataInputStream x=new DatainputStream(system.in);
[Code] ,,,,,
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Jun 21, 2014
I am just not importing the Enum value properly. The error I am getting with the DECK class is
import java.util.ArrayList;
public class Deck {
ArrayList<Card> deckList = new ArrayList<Card>();
String[] value = {"Two","Three","Four","Five","Six","Seven","Eight","Nine","Ten","Jack","Queen","King","Ace"};
String[] suit = {"Hearts","Clubs","Spades","Diamonds"};
[Code] ....
1 error found:
File: C:UsersFouadDesktopSchooCSC 162 SUMMER 14lackjack1Deck.java [line: 19]
Error: constructor Card in class Card cannot be applied to given types;
required: CardEnum.Rank,CardEnum.Suit
found: java.lang.String,java.lang.String
reason: actual argument java.lang.String cannot be converted to CardEnum.Rank by method invocation conversion
I have also tried this with the Deck Class
import java.util.ArrayList;
public class Deck {
ArrayList<Card> deckList = new ArrayList<Card>();
String[] value = {"Two","Three","Four","Five","Six","Seven","Eight","Nine","Ten","Jack","Queen","King","Ace"};
String[] suit = {"Hearts","Clubs","Spades","Diamonds"};
[Code] ....
Resulting ERROR message
2 errors found:
File: C:UsersFouadDesktopSchooCSC 162 SUMMER 14lackjack1Deck.java [line: 19]
Error: cannot find symbol
symbol: variable value
location: class CardEnum
File: C:UsersFouadDesktopSchooCSC 162 SUMMER 14lackjack1Deck.java [line: 19]
Error: cannot find symbol
symbol: variable suit
location: class CardEnum
THE FULL CODE!(BELOW)
public class BlackJack{
BlackJack() {
Deck deck = new Deck();
deck.createDeck();
System.out.println(deck.deckList);
}
public static void main(String[] args) {
new BlackJack();
[Code] ....
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May 28, 2013
If you have an enumeration type with instances whose publicly accepted names are numbers, e.g. a Chevy 396 and I'm sorting this car according to makes and models that I've already laid out within enum types for each. Here the make instance is "Chevy" and the model instance is just "396".
I know I could make this "396" into "Ch396" and this would work programmatically. But this might confuse some people who just expect to see "396".
In short, why are enum instances not allowed to be of String type rather than just standard Java identifiers ?
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Apr 15, 2014
The problem is it is returning -2, and also returning false when it should be true. There is no error it just is not working correctly.
import java.util.Arrays;
import java.util.Scanner;
/**
* This Script will allow you to add e-Mails and than beable to search for them.
*/
public class eMailSeacher
{
public static void main(String[] args)
[Code] ....
1. Enter an Email
2. Find an existing email
3. Exit
1
Enter the users E-Mail:
josh
-1
Insertion successful.
ans so on .....
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Jun 15, 2014
I have the code and it works very well, but my professor wants us to use Junit testing to test our code. I've never used JUnit before, how it works. Is it possible to have a boolean value (true or false) randomly set?
Here is the code I need to test:
package musicalinstruments;
class MusicalInstrument {
public String name;
public boolean isPlaying;
public boolean isTuned;
public MusicalInstrument(){
isPlaying = false;
isTuned = false;
[Code]...
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Mar 4, 2015
I have a enum class which contains some string which i am comparing to a string i get from a user
Java Code:
public enum Compare {
a, b, c, d, e, f
} class SomeClass {
String method(String letter){
Compare word= Compare.valueOf(letter);
}
} mh_sh_highlight_all('java');
Everything works fine but when I added a new word to it like "g" it throws the IllegalArgumentException ?
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Mar 6, 2015
Suppose I have an enum class named Faction and one of the constants is named DAUNT. I created a class of the enum DAUNT but how can I pass in a DAUNT faction type in for Daunt?
Java Code:
public enum Faction {
ALMIGHTY, AMBITION, DAUNT, RESTLESS, CAN;
}
//new file
public class Daunt {
public Daunt() {
}
} mh_sh_highlight_all('java');
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Oct 17, 2014
The instructions state: Create the following values for the enum (and make sure that they are spelled correctly, case matters):
a. SUN
b. MON
c. TUE
d. WED
e. THU
f. FRI
g. SAT
Create a private constructor for the Day enum that takes a boolean value. This boolean will determine if the day is a weekday (if it is true) or weekend (if it is false). Document it with a JavaDoc. This value will need to be stored as part of the object. Update the enum values so that they correctly call the constructor. Saturday and Sunday are the only days considered part of the weekend.
Implement the following methods:
a. boolean isWeekday()
i. Returns true if the day is a weekday.
b. Boolean isWeekend()
i. Returns true if the day is a weekend. (How could you determine that?)
c. String toString()
i. Returns the full name of the day for the enum value (i.e. Monday or Tuesday). Use either a set of nested ifs or a switch statement.
Hint: You will want to compare the this reference against the possible values in the enum.
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Mar 26, 2015
As below i m creating cookie .
Cookie myCookie = new Cookie("myck", value);
myCookie.setSecure(true);
response.addCookie(myCookie);
I am trying to read that cookie in javascript as below.
var cookieValue = $.cookie("myck");
I can see the cookie in the browser. However the read is not happening I tried to set httponly to false
myCookie.setHttpOnly(false);
However it is throwing compilation error as my servlet version is 2.5
Is there any way to get the cookie in javascript?
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Jan 11, 2015
Create an application that generates a quiz. Prompt for the user's first and last name, college major, and confidence in test taking (high, medium, or low). The quiz should contain at least five true/false questions about horticulture. When the user selects the correct answer, a message of positive reinforcement should be displayed. If the user selects the incorrect answer, the correct answer should be displayed with a message of constructive criticism. At the end of the quiz, display the number of correct and incorrect answers as well as the percentage of correct responses for each user.
import java.util.Scanner;
class HorticultureQuiz {
public static void main(String[] args){
[Code].....
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Jul 24, 2014
I'm trying to create a Label using AWT (not swing) that is invisible on startup but shows up when pressung a button. Here's the relevant code:
Label:
updated = makeConfirmedLabel("Updated!");
updated.setVisible(false);
Button:
update = new Button("Update");
update.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent evt) {
MainComponent.updateComponents();
System.out.println(updated.isVisible());
updated.setVisible(true);
System.out.println(updated.isVisible());
}
});
When I press the button I get the following output in console:
false
true
If I start with setVisible(true) and use updated.setVisible(!updated.isVisible()) it works fine. Why can't I start with it hidden??
I tried to use updated.revalidate() after setting it visible. That made it work but it makes the whole UI flicker when pushing the button which isnt desired.
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Jan 30, 2014
I have doubts in string declaration. As I know we can declare string in two ways:
1. String a=new String("Hello");
2. String b="Hello";
What is exact difference between them? Another thing is when I check (a==b) it retuns me false, but when I check a.equals(b) it returns me with true. Why So?
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Feb 26, 2005
I'm supposed to take this truth table and alter it so it displays 1's and 0's instead of true false. I'm assumed to do this I would just need to change the variable type and replace true and false with 1 and 0 but every way I try this does not work.
//a truth table for the logical operators.
class LogicalOpTable {
public static void main(String args[]) {
boolean p, q;
System.out.println("P Q AND OR XOR NOT");
p = true; q = true;
System.out.print(p + " " + q +" ");
[Code] ....
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