Covert string to a class

function covert (className:String, obj:*)
return (className)obj;
How can I achieve the function like this ??

Thanks. It works !
>Something like this should work:
>function convert( className:String , obj:Object ):Object {
var clazz:Class = getDefinitionByName( className ) as Class;
return ( obj as clazz );
>}
>
>

Similar Messages

Is it possible to pass a string representing a class name in java as an arg

Hi, this is probably a bit of a stupid question, but one that has me quite confused all the same!
Is it possible to pass a string or class name etc. representing a type of class in java, to a method so that instead of having to redefine a method with say the following args:
public SolarPanels[] bestPVPanels(int budget, int percent) {
HashMap<Integer, SolarPanels> panelsMap = new HashMap<Integer, SolarPanels>();
}As at present needing to create a methods bestWindTurbine() and many others exactly the same, but for the type, I would instead like to be able to create a method like:
public Object[] bestRenewable(int budget, int percent, String aClassName) {
HashMap<Integer, aClassName > renewableMap = new HashMap<Integer, aClassName >();
}But cant sus how to do this as passing a String is off course going to cause problems unless its it possible to cast a string to a class name, any help or advance would be much appreciated.
Thanks in advance
Pat Nevin

pNev wrote:
But cant sus how to do this as passing a String is off course going to cause problems unless its it possible to cast a string to a class nameIt's not. You can do things like
Class.forName(classNameInString);But that will only return a Class object.
And as Java generics are erased at runtime, passing the class name to the method is useless as it is too late to use it anyways.
Ah, Peter's way is what I was thinking of. Too early in the morning.
Edited by: Kayaman on 23.6.2010 10:02

Use String as name class

Hello, I have a class name on a string variable, and a method name on other string variable. I would like use this strings to invoke class and it's method, how can i do it? Thanks��
For example:
String class_name = car //name of a class
String method_name = getOwner // class car method
// How can I invoke the class and method with this strings?

// How can I invoke the class and method with this
strings?Java isn't designed to handle this kind of programming. Java uses strong type checking to make programs more safe. If you often end up wanting to do this why not use a more free-wheeling scripting language instead, such as Groovy,
http://www-128.ibm.com/developerworks/java/library/j-pg07195.html

How to convert a String variable as class name and method name?

i have two classes
class Student
public String insertStudent(String sname)
{ return("Student has been inserted "); }
class Teacher
public String execute(String methodName, String className)
{ //return statement of the method 'insertStudent' in the class 'Student'; }
}Now, i have a class with the main method. Here, i would like to call the method *'insertStudent'* of class *'Student'*
using the method *'execute'* of class *'Teacher',* passing the method-name and the class-name (viz. insertStudent, Student) as the
String parameter.
Can anyone please help me out. Thanks
regards,
chinglai

You should have just added that as a comment on your [initial posting|http://forums.sun.com/thread.jspa?threadID=5334953] instead of starting a new thread.
Now, i have a class with the main method. Here, i would like to call the method 'insertStudent' of class 'Student'using the method 'execute' of class 'Teacher', passing the method-name and the class-name (viz. insertStudent, Student) as the
String parameter.
Why oh why? What do you want to achieve?
Let me tell you: there is a way to do what you try to do, but it's not recommended and should be used only very sparingly. Especially not in anything like your code, that resembles normal business logic (as opposed to an application framework such as Spring, for example).
Can you explain what exactly you want to do with that? Why should a Teacher be able to call any random method ony any other class. And what good would that do?

Reference to string from another class

I've searched google and this forum a bit, but can't seem to find an answer. I'd say the thing I'm looking for is really simple and essential, so I must be a moron. But anyways; I want to get the output of the "process" thing in another class. How do I reference to that string fomr outside it's class?
Thanks.
public class ReadInput {
     private static void printCommands() {
         System.out.println("blabla");
         System.out.println("blabla");
         System.out.println("blabla");
public static void process(String in) {
          Do something with the String "in" here. Say, eventually rename it to "output".
public static void doReadFromStdin() {
     try {
         BufferedReader inStream = new BufferedReader (
                                         new InputStreamReader(System.in)
         String inLine = "";
         String in = inLine;
         while ( !(in.equalsIgnoreCase("quit"))
                 !(in.equalsIgnoreCase("exit")) ) {
             System.out.print("prompt> ");
             in = inStream.readLine();
             process(in);
     } catch (IOException e) {
         System.out.println("IOException: " + e);
public static void main(String[] args) {
      printCommands();
     doReadFromStdin();
}

Maybe this might help
Igor_Pavlove wrote:
public static void process(String in) {
Do something with the String "in" here. Say, eventually rename it to "output".
public static String process(String in){
//Do something, e.g.
String temp = "ifeeltired";
return temp; //Returns the String temp when this method is called.
public static void main(String[] args) {
     printCommands();
doReadFromStdin();
public static void main(String[] args){
String temp = "thisisaroughexamples";
String result = this.process(temp); //Returns a string and stores it in result
CreatePlural.print(result); //This is possible because the method print() in CreatePlural is static and an instance of CreatePlural is not required.
}Edited by: Melanie_Green on Feb 2, 2009 6:46 AM
Edited by: Melanie_Green on Feb 2, 2009 6:47 AM

Returning a string from one class to another

I have a file from where i creating an object of another class and calling the fuctionsl
This is how i am doing
public login()
String input =new String (passwordField.getPassword());
     input= input.trim();
tempuser= userField.getText();
          db2sqln patientsqln =new db2sqln(); //creating an object
          patientsqln.connectdb2();// calling a connect to database function
          patientsqln.dbselect(tempuser);// passing the login informaiont
in patientsqln i am getting the password from the database and want to pass it back to login class so that i can compare the entered password and the database password
here is i am using my patientsqln.dbselect()
//public void dbselect(String userinput)
          try
          Statement stmt = con.createStatement();
          String select = "Select patientpass from patient where PATIENTUSER="+"'"+userinput+"'";
          ResultSet rs = stmt.executeQuery(select);
          while (rs.next())
          name=rs.getString("PATIENTPASS");
          name = name.trim();
          System.out.println(name+"from db2sqln");
          rs.close();
My question is that everything else works fine, but i donot get any password back in login() class it returns null value. looks like i am not returing the string back. how should i do that
I am comparing like this
if(input.equals("name"))
System.out.println("Correct password");
else{
System.out.println("Incorrect password");
//

I have a file from where i creating an object of another class and calling the fuctionsl
This is how i am doing
public login()
String input =new String (passwordField.getPassword());
input= input.trim();
tempuser= userField.getText();
db2sqln patientsqln =new db2sqln(); //creating an object
patientsqln.connectdb2();// calling a connect to database function
patientsqln.dbselect(tempuser);// passing the login informaiont
in patientsqln i am getting the password from the database and want to pass it back to login class so that i can compare the entered password and the database password
here is i am using my patientsqln.dbselect()
//public void dbselect(String userinput)
try
Statement stmt = con.createStatement();
String select = "Select patientpass from patient where PATIENTUSER="+"'"+userinput+"'";
ResultSet rs = stmt.executeQuery(select);
while (rs.next())
name=rs.getString("PATIENTPASS");
name = name.trim();
System.out.println(name+"from db2sqln");
rs.close();
My question is that everything else works fine, but i donot get any password back in login() class it returns null value. looks like i am not returing the string back. how should i do that
I am comparing like this
if(input.equals("name"))
System.out.println("Correct password");
else{
System.out.println("Incorrect password");
//

Determine a string from main class in an outside class

Hello there,
This might be stupid question but I cant think, I am so very tired. Okay here is the question, is there any way we could see or the get the value of a string(just a string which is set in main class'A', its already set, we cannot make it static r anything like that)in a method outside that main class, probably in a method 'x' in class'C'.
Thanks
potti

Yes, you can, in many ways, or else Java would be moot. Excluding the static way of doing it, which by the way is evil, your class C can make an instance of class A and then access it either as a public field or as the value returned by a public method. You can also use inheritance, but it's pointless in this case, inheritance is meant to abstract, extend functionality, and prevent having to rewrite code. It's not meant for accessing fields. And by the way, inheritance, too, is evil.
This is one way to do it.
class A {
     public String s = "great balls of fire";
public class C {
     public static void main(String[] args) {
          A myInstance = new A();
          String s = myInstance.s;
          System.out.println(s);
}This is the preferred way to do it, as it encapsulates the String. The idea of encapsulation is to access fields by a method instead of directly since interfaces are less likely to change than an object's data and in the case that the object's data does change and the interface does not, the changes will remain local.
class A {
     private String s = "great balls of fire";
     public String getS() { return s; }
public class C {
     public static void main(String[] args) {
          A a = new A();
          String s = a.getS();
          System.out.println(s);
}

How to disply empty cell from a string using stringtokenizer class

Hello All
I had wriiten a small program to read the string and split the string into different tuples.When i had empty cell in string i am unable to display it. Can any body help me out pls?
code given below
import java.io.*;
import java.util.StringTokenizer;
class Tokenize {
// Create BufferedReader class instance
static InputStreamReader input = new InputStreamReader(System.in);
static BufferedReader keyboardInput = new BufferedReader(input);
static String record;
/* Main method */
public static void main(String[] args) throws IOException {
     //declare the string variables
     String text,delim,var,delimv,vname;
     String X = "x";
     int i = 1;
     //read the inputs from keyboard for variables and delimv
     System.out.print("What is your variable names? ");
var = keyboardInput.readLine();
System.out.println("variable are :" + var );
     System.out.print("What is your separator? ");
     delimv = keyboardInput.readLine();
     //read the inputs from keyboard for string and delim
System.out.print("What is your String? ");
text = keyboardInput.readLine();
System.out.println("String is :" + text );
     System.out.print("What is your separator? ");
     delim = keyboardInput.readLine();
     //create the stringtokenizer class instance
     StringTokenizer vt = new StringTokenizer(var,delimv);
     StringTokenizer st = new StringTokenizer(text,delim);
     //print the nexttokens as long as tokens and variables are available
     while (vt.hasMoreTokens()) {
     while (st.hasMoreTokens()) {
     vname = vt.nextToken();
     //     if(st.nextElement() == X){
     // System.out.println("filed is empty");
     // System.out.println(vname + "= ");
     System.out.println(vname + "=" + st.nextToken());
               //nextToken());
Variables name : cat1,cat2,cat3,cat4,cat5,cat6,cat7,cat8,cat9,cat10,cat11
String name : Produkten;Voor hem;;Funny Mask ;12.50;4.90;17.40;1-5 dagen;0;http://www.eroticastore.nl/ProductDetails.asp?ProductId=21733&ReferrerId=134;http://www.eroticastore.nl/ProductImages/thumb_3300000510.jpg
Note : Empty cell is in between "Voor hem" and "Funny Mask"
Thanks In advance,
Murali

When you post code, please use [code] and [/code] tags as described in Formatting Help on the message entry page. It makes it much easier to read.

Re: Passing a string from Java class to JSP

How can I pass a string from a function within my bean class to my JSP page?
I would like to pass something like this with the necessary params filled in:
String myString ="Successful <b>" + Sales.getActionType() + "</b> was made on <b>" + (new Date()).toString();
The ActionType will be either a BUY or SELL and the current date need to be added in.
Thank you in advance!

SOLVED THE PROBLEM!!!

How to accept 2 strings in a class with try catch method..help!!

the program below will accept two strings and compare str1 and str2 if equal. this program uses functions. can any one help me with this?
import java.io.*;
public class StrCompare {
     private BufferedReader takyoin = null;
     //private BufferedReader intakyo = null;
     * @param args
     public StrCompare(){
          takyoin = new BufferedReader(new InputStreamReader(System.in));
          //intakyo = new BufferedReader(new InputStreamReader(System.in));
     public String UserInput(){
     public static void main(String[] args) {
          // TODO Auto-generated method stub
}

What are you talking about? There is no such thing as "try-catch-methods", and there are no functions but methods.
Strings by the way have their own means of comparision. Apart from that: do your own homework.

How to pass string from a class to another on button click

Hai forum i'm developing an application in which i have frame1(seperate class without main) where i get a excel files and get the tablenames of it(sheets).
There i choose a sheet from availabe sheets and i have to pass it frame2 on clicking a button on frame1.
The sheet name is chosen from a JComboBox in frame1:(code)
sheetcombo.addActionListener(new java.awt.event.ActionListener()
                    public void actionPerformed(java.awt.event.ActionEvent e)
                              JComboBox cb = (JComboBox)e.getSource();
                              String sheetname = (String)cb.getSelectedItem();
I dont get how to pass this String sheetname to frame2 where i call the constructor of frame1 initialize it. Help me out. Thanks in advance...

1 write a set method in frame 2 class
2 create a instance of frame 2 class in frame 1
3 in actionaPerformed method write code as follows
frame2obj.set(sheetname)
this should work :-)

Covert String Array to String

Hey,
I have this code that take a string
EX:
Straw? No, too stupid a fad, I put soot on warts
and takes out the "?" and "," and places a space in their spot, then tokenizes the string so now all the spaces are gone (right?) then places the tokenized string into and array. Now I want that array into a string.
Pretty much what I want to go from is
this:
Straw? No, too stupid a fad, I put soot on warts
to:
StrawNotoostupidafadIputsootonwarts
here is my code
import java.util.*;
public class TrivialApplication {
     public static void main(String args[])
          System.out.println( "Hello World!\n" );
          String hello = "Straw? No, too stupid a fad, I put soot on warts";
          hello = hello.replace('?',' ');
          hello = hello.replace(',',' ');
          StringTokenizer tokenizer = new StringTokenizer(hello);
          String[] array = new String[hello.length()];
          System.out.println(tokenizer.countTokens());
          System.out.println(hello.length());
          int count = tokenizer.countTokens();
          int x = 0;
          while(tokenizer.hasMoreTokens())
               array[x] = tokenizer.nextToken();
               x++;
}

Sweet thanks man here is the finished code. I took out the array because it was now not needed.
import java.util.*;
public class TrivialApplication {
     public static void main(String args[])
          System.out.println( "Hello World!\n" );
          String hello = "Straw? No, too stupid a fad, I put soot on warts";
          System.out.println(hello + "\n");
          hello = hello.replace('?',' ');
          hello = hello.replace(',',' ');
          StringTokenizer tokenizer = new StringTokenizer(hello);
          StringBuffer buffer = new StringBuffer();
          int count = tokenizer.countTokens();
          while(tokenizer.hasMoreTokens())
               buffer = buffer.append(tokenizer.nextToken());
          hello = buffer.toString();
          System.out.println("New String with changes \n");
          System.out.println(hello);
[\code]

Accessing string from other classes

Sorry if this seems simple to you, but i'm having problems accessing four string that are declared and used in my public class from another class.
I've tried declaring the strings public but it still says 'cannot resolve symbol' when i try to compile.
Help much appreciated.
fightspam

Yep, heres my code(sorry if it's a bit untidy):
//Zimmerman M3 email client.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
class where extends JFrame implements ActionListener
     private JLabel path;
     private JTextField pathText;
     private String pathFile;
     private JButton save;
     File outputFile = new File(pathFile);
     public where()
          super("Save Email");
          Container f=getContentPane();
               f.setLayout(new FlowLayout(FlowLayout.LEFT, 5, 5));
          f.setBackground(Color.lightGray);
          path = new JLabel("Path: ");
          f.add(path);
          pathText = new JTextField(20);
          f.add(pathText);
          save = new JButton("Save");
          f.add(save);
          this.setSize(300, 100);
     public void actionPerformed(ActionEvent q)
          pathFile = pathText.getText();
          try
               FileWriter out = new FileWriter(outputFile);
               out.write(zimmernorm.toFile);
               out.write(zimmernorm.fromFile);
               out.write(zimmernorm.subjectFile);
               out.write(zimmernorm.bodyFile);
               out.close();
          catch(IOException err)
               System.exit(0);
class about extends JFrame
     private JLabel title;
     public about()
          super("About Zimmerman M3");
          Container d=getContentPane();
               d.setLayout(new FlowLayout(FlowLayout.LEFT, 5, 5));
          d.setBackground(Color.lightGray);
          title = new JLabel("Zimmerman M3 by Louis Goddard, 2003");
          d.add(title);
          this.setSize(246, 62);
class newmail extends JFrame implements ActionListener
     public static String toFile, fromFile, subjectFile, bodyFile;
     public JTextField To, From, Subject;
     private String toBuffer, fromBuffer, subjectBuffer, bodyBuffer;
     private JButton send, clear;
     private JTextArea Body;
     private JLabel toLabel, fromLabel, subjectLabel;
     private JMenuBar mb;
     private JMenu File, Edit;
     private JMenuItem New, Sender, Copy, Paste, About;
     public newmail()
                super("New Email");
          Container c=getContentPane();
               c.setLayout(new FlowLayout(FlowLayout.LEFT, 5, 5));
          c.setBackground(Color.lightGray);
          //<MENU STUFF!!!>
               mb = new JMenuBar();
               File = new JMenu("File");
               Edit = new JMenu("Edit");
               New = new JMenuItem("New");
               Sender = new JMenuItem("Save");
               Copy = new JMenuItem("Copy");
               Paste = new JMenuItem("Paste");
               File.add(New);
               New.addActionListener(this);
               New.setActionCommand("1");
               File.add(Sender);
               Sender.addActionListener(this);
               Sender.setActionCommand("2");
               Edit.add(Copy);
               Copy.addActionListener(this);
               Copy.setActionCommand("3");
               Edit.add(Paste);
               Paste.addActionListener(this);
               Paste.setActionCommand("4");
               mb.add(File);
               mb.add(Edit);
               setJMenuBar(mb);
          //</MENU STUFF!!!>
          toLabel = new JLabel("To:          ");
          c.add(toLabel);
          To = new JTextField(35);
          c.add(To);
          fromLabel = new JLabel("From:     ");
          c.add(fromLabel);
          From = new JTextField(35);
          c.add(From);
          subjectLabel = new JLabel("Subject:");
          c.add(subjectLabel);
          Subject = new JTextField(35);
          c.add(Subject);
          Body = new JTextArea(12,40);
          c.add(Body);
          send = new JButton("Send");
                c.add(send);
          clear = new JButton("Clear");
                c.add(clear);
          clear.addActionListener(this);
          clear.setActionCommand("6");
          this.setSize(459, 364);
          public static void main(String []args)
               JFrame.setDefaultLookAndFeelDecorated(true);
               new newmail().show();
          public void actionPerformed(ActionEvent e)
               String s = e.getActionCommand();
               if (s == ("1"))
               new newmail().show();
               else if (s == ("2"))
               new where().show();
               toFile = To.getText();
               fromFile = From.getText();
               subjectFile = Subject.getText();
               bodyFile = Body.getText();
               else if (s == ("3"))
               bodyBuffer = Body.getSelectedText();
               toBuffer = To.getSelectedText();
               fromBuffer = From.getSelectedText();
               subjectBuffer = Subject.getSelectedText();
               else if (s == ("4"))
               Body.setText(bodyBuffer);
               To.setText(toBuffer);
               From.setText(fromBuffer);
               Subject.setText(subjectBuffer);
               else if (s == ("5"))
               new about().show();
               else if (s == ("6"))
               To.setText("");
               From.setText("");
               Subject.setText("");
               Body.setText("");
public class zimmernorm extends JFrame implements ActionListener
     public String toFile, fromFile, subjectFile, bodyFile;
     private String toBuffer, fromBuffer, subjectBuffer, bodyBuffer;
     private JMenuBar mb;
     private JMenu File, Help, View;
     private JMenuItem New, About, Inboxmenu, Outboxmenu, Savedmenu;
     public zimmernorm()
                super("Zimmerman M3");
          Container c=getContentPane();
               c.setLayout(new FlowLayout(FlowLayout.LEFT, 5, 5));
          c.setBackground(Color.lightGray);
          //<MENU STUFF!!!>
               mb = new JMenuBar();
               File = new JMenu("File");
               View = new JMenu("View");
               Help = new JMenu("Help");
               New = new JMenuItem("New");
               About = new JMenuItem("About");
               Inboxmenu = new JMenuItem("Inbox");
               Outboxmenu = new JMenuItem("Outbox");
               Savedmenu = new JMenuItem("Saved");
               File.add(New);
               New.addActionListener(this);
               New.setActionCommand("1");
               Help.add(About);
               About.addActionListener(this);
               About.setActionCommand("5");
               View.add(Inboxmenu);
               Inboxmenu.addActionListener(this);
               Inboxmenu.setActionCommand("7");
               View.add(Outboxmenu);
               Outboxmenu.addActionListener(this);
               Outboxmenu.setActionCommand("8");
               View.add(Savedmenu);
               Savedmenu.addActionListener(this);
               Savedmenu.setActionCommand("9");
               mb.add(File);
               mb.add(Help);
               mb.add(View);
               setJMenuBar(mb);
          //</MENU STUFF!!!>
          this.setSize(1024, 768);
                this.setDefaultCloseOperation( EXIT_ON_CLOSE );
          public static void main(String []args)
               JFrame.setDefaultLookAndFeelDecorated(true);
               new zimmernorm().show();
          public void actionPerformed(ActionEvent e)
               String s = e.getActionCommand();
               if (s == ("1"))
               new newmail().show();
               else if (s == ("5"))
               new about().show();

Tochange the string in Std Class Builder "New Method"

HI freinds,
Im using the std program of "RFDOPR10"...(changed into my customised program as ZRFDOPR10).....
Here i want to change the strings of Id_type eq 4 availble under the class builder "New Method".
"id_ruler_string = '2.13.24.29|43|58|73|88|103|118|'" (for 24...i want to give 38.....then 45...)
Pls help me how to change the std method function for my z program...
FYR:
RFDOPR10 is the std program for tcode :"s_alr_87012178", Customer analysis.If u want to c the example report, in this tcode...give OI:1, Summ level:6, OI list:1 and Company CD:2 under Output control tab in selection screen with Company code.Now, u able to see the reports in the screen.There, after Customer number....I've to give some more spaces(length) for Sort field.
Thanks & regards
Sankar.

Associated with the text box there will be some kind of event handler. Maybe it's an action event on the text box (when the user clicks return) or maybe you have a separate button that the user clicks.
Either way, in the event handler, get the text from the text box, and then call the sendData method, passing the text as an argument.

Escape XML Strings with JDK class

Hi,
can anyone tell me how to escape XML-Strings with classes of the JDK?
When searching I only was pointed to StringEscapeUtils from apache.commons.lang, but we would prefer to use the JDK instead of integrating an external lib.
Our aim is to escape an XML attribute, so a CDATA is not applicable for us in this case.
Thanks
Jan

I implemented it by myself:
public static String escapeXmlAttribute(String attributeValue) {
        StringBuffer result = new StringBuffer();
        for (int c = 0; c < attributeValue.length(); ++c) {
            if (attributeValue.charAt(c) == '"') {
                result.append(""");
            } else if (attributeValue.charAt(c) == '&') {
                result.append("&");
            } else if (attributeValue.charAt(c) == '<') {
                result.append("<");
            } else if (attributeValue.charAt(c) == '>') {
                result.append(">");
            } else {
                result.append(attributeValue.charAt(c));
        return result.toString();
    }{code}

Covert string to a class

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