Passing A Map As Parameter

Apr 30, 2014

I'm using Java in BlueJ where I'm trying to write a class to store cycling club membership details in a map. I'm trying to pass a map as a parameter to a function that will iterate over the map and print out the member details. My code is:

public class CtcMembers
{
//instance variables
private Map<String, Set<String>> memberMap;
/**
* Constructor for objects of class CtcMembers

[Code] ....

When I execute the following in the OU workspace:

CtcMembers c = new CtcMembers();
c.addCyclists();

I can see a map populated with the expected details.

When I execute the following in the OU workspace:

c.printMap(c.getMap());

I get the following error:

java.lang.ClassCastException: java.util.HashSet cannot be cast to java.lang.String
in CtcMembers.printMap(CtcMembers.java:81)
in (OUWorkspace:1)

I wasn't aware I was trying to cast anything so this has got me baffled.

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Passing Object As Parameter?

Aug 8, 2014

i want to pass an object of type Software to assign it to a computer from Computer class...

i should note that computer and software are arrays of objects thats the variable and method to set software in Computer class

private Software[] software;
public void setSoftware(Software software,int index){
this.software[index]=software;}

note: the user choses the a computer from a list and a software as will

for example the program will show the user 2 computers

0 for computer: apple, Model: mac mini, Speed: 2.8

1 for computer: sony, Model: vaio, Speed: 2.2

the user enters the index he wants then the program will show a list of software to add to the computer selected

the error I'm having is run time error Exception in thread "main" java.lang.NullPointerException and it points to these 2 lines

1.comp[Cch].setSoftware(software,Sch);

2. the method setSoftware

every thing is running correctly but this step above

Cch= the chosen computer index

Sch= the chosen Software index

why am i getting an error and how to fix it?

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Try Catch Passing Parameter

Oct 15, 2014

I'm asking if there is a way to pass parameter between try/catch block.

I have a method:
 
public void invia(OiStorto invioaca) throws Exception {      
         Long id=0L;
        try {
               //some code
     for (VElenpere elenpere : elenperes) {

[Code] ...

The method called in the for:

private void popolaScompiute(Long anno, InviaEOI inviaEOI0, _4IntegerType param, ElOpeIncType opereIncompiute,
            VElencoOpere elencoOpere,Long id) { 
        try {
          //some code
     for (OiOpera opere : oiOpere){
             
[Code] ....
   
And finally the method in which the error can occur (the method poputa is called for every id)
 
private void poputa(ElOpeIncType opereIncompiute, OpeIncType operaSingola, OiOpera opere) {
try {
//some code
} catch (NullPointerException e) {
            e.printStackTrace();
            //return id;
        }
       
So method invia call the method popolaScompiute, inside popolaScompiute there is an iteration through some id and for some id can occur an error; what i want is the getting the value of id in the first method invia, using the block try/catch. Is there a way to accomplish this?

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JSP :: Passing Parameter To Imported File

May 14, 2014

I am trying to run an example in which I pass a parameter to imported file but its not working.

This is my header.jspf file which I will include in a jsp file.

<img >
<br>${param.sub}

And This is the JSP file contact.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<body>
<c:import url="header.jspf">
<c:param name="sub" value="We love to hear from our clients------------" />
</c:import>
<br><br>

Now this is JSP page content

</body>
</html>

When I hit the contact.jsp file , It does show me the image I have on header.jspf , but its not able to print the parameter that I am setting in <c:param>

So after showing image it just shows ${param.sub}. So EL is not translated properly.

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Passing A Boolean Parameter From One Method To Other

Jan 30, 2015

Java SE Runtime Environment build 1.8.0..This is part of the code:

public static int addAddress (String[] number, boolean[] front, double[] total) {
int num = 0;
double ffee = 0;
/*boolean value = false;*/
 
[code]...

I have tried using the line of code commented out, /*boolean value = false;*/. However, another error is displayed. The compiler shows the following...

Inspection.java:33: error: incompatible types: boolean cannot be converted to boolean[]
front[num]= defineFront(num, value);
^
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output error...I know that boolean values are by default stored as false, once you create the array. However, I'm having trouble passing the variable to the method.

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Passing Object As Parameter - Combination Values Are All Zero

Mar 8, 2015

I have an object that has an instance of another object class as its parameter :

CombinationLock oneHundred = new CombinationLock(28,17,39);
Locker Mickey = new Locker(100, "Mickey", 3, oneHundred);

This is for a locker, which has a combination assigned to the student. Within the locker class I have the following constructor:

public Locker(int locker, String student, int numberOfBooks, CombinationLock combo) {
this.locker = locker;
this.combo = combo;
this.student = student;
this.numberOfBooks = numberOfBooks;
}

combo is the private CombinationLocker object I created within the Locker class. Do I need to pass the combo object on to the CombinationLock class? For reason, I do not comprehend, the combination password from the main class is not passing through to the CombinationLock class, and the combination values are all zero.

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ASCII File - Passing Array As Parameter?

Feb 23, 2014

I am trying to make a class definition file for an ASCII File.

Ultimately, I want to be able to add methods to allow the image produced by the file to be printed normally, then printed with various manipulations.

However, for some reason, whenever I try to run the program to test my normalPrint method, it terminates without printing anything.

I think this is because the array's values width and height are not within the scope of the method. I tried passing the array as a parameter for the method like so:

Java Code:

public void normalPrint(char [][] poop){
//method here
} mh_sh_highlight_all('java');

But it gave me an error that stated

"The method normalPrint(char[][]) in the type asciiFile is not applicable for the arguments ()"

Class Definition:

Java Code:

import java.io.*;
import java.util.Scanner;
public class asciiFile {
int height;
int width;

[Code] .....

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Passing Parameter From Object Of Class B To Object Of Class C By Use Of Class A?

Dec 13, 2014

Assuming that we have two classes B and C which inherit from class A. What is the best way to pass a parameter from an object of class B to an object of class C by the use of class A without using static variable and without defining a get function in B?

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Non-Parameter Constructor Calls Two Parameter Constructor

Apr 19, 2014

I was practicing my java skills and came across an exercise in which a non parameter constructor calls a two parameter constructor. I tried a few searches online but they all came back unsuccessful. This is the part I am working on:

public PairOfDice(int val1, int val2) {
// Constructor. Creates a pair of dice that
// are initially showing the values val1 and val2.
die1 = val1; // Assign specified values
die2 = val2; // to the instance variables.
}
public PairOfDice() {
// Constructor that calls two parameter constructor
}

I tried calling the two constructor using the line "this(val1, val2)" but I get an error because val1 and val2 are local variables.

Then I tried to use the same signature: "this(int val1, int val2)" but that didn't work either.

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JSP :: Getting Parameter Dynamically?

Mar 30, 2014

I'm displaying a 3-column table with the column names ID, name, and salary. I made the ID into a link to go to the EditServlet class. What I'm trying to do is figure out which ID# was clicked to get onto the servlet page, how to implement that dynamically?

I know that if you put something like ?x=1 and then getParameter("x") on the servlet page would work, but then all the IDs would have the same parameters since I'm using a for loop to print out my ArrayList of objects.

My code for the jsp part is below.

for (int count=0; count<list.size(); count++) {
%>
<tr>
<td> <a href="EditServlet"><%= list.get(count).id %></a>
<td> <%= list.get(count).name %>

[Code] ....

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Using Enumeration As Parameter?

May 18, 2014

I am trying to create a method called getVariable will has a parameter of a variable that has a type of Test, an enumeration. An int variable called x is assigned a value of 5, and through control statements, I want its value to change depending on what the argument is. I was able to correctly create this method, but when I use it I get an error saying, "non static method getVariable(Test) cannot be referenced from a static context" on line 28.

Here is the code:

package javaapplication5;
public class Product implements Cloneable
{

[Code].....

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Mar 11, 2015

I have a entry in application.properties file

caption_bubble_value.title={0} is a caption for the element box

JSP File

<fmt:message key="caption_bubble_value.title" />

in the java file I am setting a parameter to session

request.getSession().setAttribute("replaceVal", "Value headline");

How can I get the text "Value headline is a caption for the element box" on the page?

The replacement should happen on an event.

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JSP :: Pass Column Name As Parameter?

Mar 23, 2014

Is it possible to pass column name as a parameter using servlets?

I tried using the following code but it doesnt work

String date=request.getParameter("date");
String sql="alter table cs1_cn add " +date+ " boolean";
PreparedStatement ps=conn.prepareStatement(sql);

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String Including Parameter

Mar 25, 2015

I am taking a parameter of type String and checking if either the city or state contains the "keyword", whatever it may be. I am using an arrayList of 10,000 customers and adding any customer that lives in a city or state that contains the keyword to a new arrayList and then returning that arrayList. I thought my solution was correct, but when using the JUnitTest provided, it is not quite passing the test. My solution is as follows.

Java Code:

public ArrayList <Customer> getMailingList(String keyword){
ArrayList <Customer> key = new ArrayList<Customer>();
keyword = keyword.toLowerCase();
for(Customer c : data){
if(c.getState().contains(keyword) || c.getCity().contains(keyword)){
key.add(c);
}
}
return key;
} mh_sh_highlight_all('java');

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Can Pass In Return Value In Parameter?

Jun 25, 2014

Can I pass in a return value in a parameter? I'm trying to do something like this:

Object o = new Object(anotherObject.method());

Where method returns an int. But when I try doing this it calls that method, rather than passing in the return value..

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PrintWriter Using FileWriter As Parameter

Oct 24, 2014

How to write a new file:

import acm.program.*;
import java.io.*;
import java.io.PrintWriter.*;
import acm.util.*;
import javax.swing.*;
public class PrintWriter extends ConsoleProgram {

public void run() {

try {
PrintWriter wr = new PrintWriter( new FileWriter ("hello.txt") ) ;
wr.println("Hello world!");
wr.close();
} catch (IOException er) {
println("File could not be saved.");
}
}
}

(I added the imports at top myself.) However, I am getting compiler errors for the lines: PrintWriter wr = new PrintWriter( new FileWriter ("hello.txt") ) , which says that the constructor PrintWriter( FileWriter ) is undefined, and
wr.close();, which says close() method is undefined.

Pretty sure the only real problem is that PrintWriter is not accepting the FileWriter as constructor, but I don't see why. I have tried this on machine with JRE 1.4 and it worked as expected, creating new file titled "hello.txt", prints line of "Hello world!" in that file, and saves it to the directory I picked in the dialog. But I can't get it to work on this machine that uses Compiler 1.6, Java Runtime v8u25.

I have also tried using just a string in the parameter for PrintWriter, such as PrintWriter wr = new PrintWriter ("hello.txt") , and from what I can tell by reading the java spec for java 8, this should work. [URL] .... But I get error message for that constructor as well.

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Mar 24, 2014

I use :

ResultSet rs = null;
ps_getValue = conn.prepareStatement(s_getValue);
               ps_getValue.setString(1, sValue1);
rs = ps_getValue.executeQuery();

Error :

java.sql.SQLException: Missing IN or OUT parameter at index:: 1

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Mar 7, 2015

I have a variable <c:set var="var1" value = "myvalue" /> , I want to pass var1 as <%= new customclass().method1(var1) %>.what is the syntax to pass this value.

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Apr 3, 2015

I want to run a function on load only when a particular parameter is not present?

My question is how to detect in JSP that if a particular parameter is present or not?

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Jan 2, 2014

So, I am learning Swing, and Swing Layouts. I just came across a really confusing (for me) line of code.

Java Code:

setLayout(new BorderLayout()); mh_sh_highlight_all('java');

So, this is weird for me because I don't really understand why the BorderLayout class constructor is being initialized as a parameter for the setLayout..

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How To Map Parameters From Multiple Classes Into One Set Of Parameter

Mar 6, 2014

I have multiple Java classes that holds lots of time based parameters, e.g.: (simplified):

Java Code: class Engine {
float rpm;
boolean enabled;
int runningTime;

[code]....

Is there any simply solution to map all these parameters from my TimeRecord to one list(vector,map) of params that user can choose from and see the value in proper form (floating type, boolean type) ?

I just want that user can pick a paremter's name from list or combobox and choose parameter that he wants to see. I don't want to duplicate the data - just some kind of mapping algorithm between list of parameters names and my TimeRecord. eg. some collection class that holds all names and connections: Parameters params; fill combo/list from this class for ( String name : params ) { combo.add(name);}, then when user picks some field from combo: params.getValue( myTimeRecord, name ) return correct parameter value (just my first thought)

Later, I want to replace all floats,ints,booleans with some kind of templated class eg. Value which will hold all kinds of measurement unit with conversion support - but it's only a plan now.

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Mar 20, 2014

How can I check the existence of a parameter in Java and if it doesn't exists, I want to assign a default value?

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Jul 25, 2014

I have this class and I want to pass "pergunta" from another class:

Java Code:

here* = if I put a number, the code works. I want to receive the parameter "pergunta" here but I can't put a parameter in start .

I want to populate the array pergunta in a previous class and use in this one.

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.stage.Stage;
import javafx.scene.chart.*;
import javafx.scene.Group;

[code]....

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Mar 22, 2014

What is limitation for command line parameter??

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Jan 3, 2015

I have a method that accepts as a parameter an object:

public void addClient(Client c){ }

Client is a class which has a constructor that has two String parameters:

public Cliente (String name, String lastname){
this.name = name;
this.lastname = lastname;
}

In the main add a Client in this way:

addClient(new Cliente("first", "second"));

Now, i have an array of Client, so I would like to enter within this. Example:

public void addClient(Client c){
for (int i = 0; i<client.length ; i++) { // client is an array of Client object
client[i] = c; // Enter a c in the array, but does not work!
System.out.println("test "+clienti[i]); // print Client@15db9743
}
}

I have used the println for check if worked insertion, but the result shows no

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How Is Class Cast In Method Parameter

Jan 15, 2014

how is cast a class at a methods parameters? i have a problems in a methods paramter. i draw red line my exception and mymethods is orage color ....

Caffe drink = new Caffe();
CoffeCup cup = new CoffeCup();
cup.setTempeture(100);
drink.drinkcaffe((CaffeCup)(cup.getTempeture()));

[code]....

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