String To Boolean

Trying to get a StringTokenizer to read a token, and then have that token converted to a boolean.
Tried:
Boolean b;
b = Boolean.valueOf(st.nextToken());
And other variations of of that.
Is this even possible to do?
Thanks

do you ever search before posting your questions? have you tried google? it's pretty cool.
i noticed in another thread you didn;t understand the idea of extending a class. i'll give you an example.
you extend a class, when you want a new class to have all of it's attributes and then some more. here, i extend button to create a button that plays a noise when clicked.
class NewButton extends Button implements ActionListner{
  Audioclip clip;
  public NewButton(String string, AudioClip audioclip){
       super(string);
       clip=audioclip;
       this.addActionListner(this);
   public void actionPerformed(ActionEvent e){
      clip.play();
}so in you previous examples that you've posted over and over and over, dog and cat should not be inner classes of mammal, but should extend mammal. you say you've read the "don't fear the oop" tutorial, but if you had you would understand this. in his example, Villian extends Human, and inherets all the attributes of Human. did you read it twice? often, re-reading something after it has sat on your brain a while will provide some insight, and you could use a lot of insight!

Similar Messages

  • How can I convert a String into boolean?

    I am facing difficulty in converting String into boolean.
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    Please advise...
    credit = JOptionPane.showInputDialog("Enter Yes or No for Credit Satisfactory : ");
    System.out.println("The answer for Credit Satisfactory : "+credit);
    e_invtry=JOptionPane.showInputDialog("Enter Yes or No for inventry level");
    System.out.println("The answer for Quantity Order : "+e_invtry);
    Message was edited by:
    SummerCool

    Thanks...but I don't get it....I tried to use your
    suggestion but i got the message that " cannot find
    symbol method
    showConfirmDialog(java.lang.String,int)" ???
    Please advise.
    The code I use was :
    int credit = JOptionPane.showConfirmDialog("Enter Yes
    or No for credit satisfactory",
    JOptionPane.YES_NO_OPTION);Well that was not the example I gave you.
    JOptionPane has no method showConfirmDialog that receives a String and an int (exactly what the error message is telling you).
    What was wrong with the version I showed you?

  • Parse a String to boolean

    How do you parse a String to boolean, isn't like this? I get this inconertible types error, that require boolean
    boolean all = (boolean)tokens.nextToken();
    Thanks!

    What string means true, and what string means false? The string "true" or "false"? In that case, you can simply use the Boolean.valueOf(String) method:
    public static Boolean valueOf(String s)
        Returns a Boolean with a value represented by the specified String. The Boolean returned represents the value true if the string argument is not null and is equal, ignoring case, to the string "true".
        Example: Boolean.valueOf("True") returns true.
        Example: Boolean.valueOf("yes") returns false.
        Parameters:
            s - a string.
        Returns:
            the Boolean value represented by the string.Otherwise, you can use something like:
      boolean b = string.equals("true");or if string can be null to also mean false:
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  • [svn:bz-trunk] 22381: Add some unit tests for the flex.messaging.client. FlexClientManager, including one for the new getFlexClient(String id, boolean createNewIfNotExist) method signature.

    Revision: 22381
    Revision: 22381
    Author:   [email protected]
    Date:     2011-09-02 05:10:41 -0700 (Fri, 02 Sep 2011)
    Log Message:
    Add some unit tests for the flex.messaging.client.FlexClientManager, including one for the new getFlexClient(String id, boolean createNewIfNotExist) method signature.
    Added Paths:
        blazeds/trunk/modules/core/test/src/flex/messaging/client/
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  • Formula string with boolean operations

    Hello all,
    I created sample logic to do Boolean operations with string.
    Example:
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    Attachments:
    Formula String to Boolean operations.zip ‏30 KB

    I figure there has to be a way to get to a formula node by way of scripting.  So I started playing around.
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    Example_VI.png ‏34 KB

  • Converting String to boolean not working

    Hello there - I am having a bit of trouble - I am trying to write a program to evaluate boolean expressions (fully parenthesized) As StringTokenizer goes through the expression, the boolean values are being pushed (as Boolean objects) and popped (converted to String) correctly, but the expression I am using to evaluate them is evaluating false (see my debug below)
    In my current code, I have op1 and op2 coming off of the stack as Strings but am not sure if Boolean.getBoolean() is the right method to use to convert them to boolean values. The Sun docs weren't very helpful and there wasn't anything that I could find on the Sun forum about converting Strings to boolean (vs. Boolean). This is what my evaluate code looks like:
    if (operation.equals("||")) {
    opB1 = Boolean.getBoolean(op1);
    opB2 = Boolean.getBoolean(op2);
    test = (opB1 || opB2);
    System.out.println("test = (opB1 || opB2) " + (opB1 || opB2)); //debug
    System.out.println("opB1 = " + opB1 + " opB2 = " + opB2); //debug
    In the above example - using the expression "( ( 1 < 2 ) && ( 2 > 1 ) )" my debug reads like this:
    Operator added to stack is (
    Operator added to stack is (
    Operand added to stack is 1
    Operator added to stack is <
    Operand added to stack is 2
    Operation removed from stack is <
    Operand removed from stack is 2
    Operand removed from stack is 1
    Boolean operand added to stack is true
    Operation removed from stack is (
    Operator added to stack is &&
    Operator added to stack is (
    Operand added to stack is 2
    Operator added to stack is >
    Operand added to stack is 1
    Operation removed from stack is >
    Operand removed from stack is 1
    Operand removed from stack is 2
    Boolean operand added to stack is true
    Operation removed from stack is (
    Operation removed from stack is &&
    Operand removed from stack is true //NOTE: values are both true
    Operand removed from stack is true
    test = (opB1 && opB2) false //NOTE: expression is evaluating as false
    opB1 = false opB2 = false //NOTE: converted String went from true to false!!
    Boolean operand added to stack is false
    Operation removed from stack is (
    When I changed the type of opB1 & opB2 to type Boolean, and use:
    if (operation.equals("||")) {
    opB1 = Boolean.valueOf(op1);
    opB2 = Boolean.valueOf(op2);
    test = (opB1 || opB2);
    System.out.println("test = (opB1 || opB2) " + (opB1 || opB2)); //debug
    System.out.println("opB1 = " + opB1 + " opB2 = " + opB2); //debug
    I get an error that || and && can't be used on type Boolean.
    I've spent several hours on this boolean part alone - any suggestions? (BTW - sorry for the long message!)

    You're a genius!! Wow I never would have figured that one out in a million years!! BTW - can you tell me how you got your code to be so nicely formatted in the post?
    Everytime I cut and paste - it looks aweful and all of the indentations are gone...
    Thanks again!!!

  • In look out for code to blindly converting a string to boolean

    I have an expression (String) which is a boolean by syntax, already has embeded && , ||, ! and |, & operators. So, I would like to convert my String in boolean with least effort..I do not intend to use other math operators.
    Any suggestions?

    See the replies of your previous post.

  • Need to convert a string to boolean

    i have string true, false, i need to convert them to boolean, is it good to use String.equals(true/false) or is it good to use Boolean.valueOf(true/false)
    Regards,
    Surya

    See http://forum.java.sun.com/thread.jsp?forum=54&thread=455788&tstart=0&trange=30.
    Remember, '=' is assignment, '==' is equals...

  • Convert from String to boolean ??

    hi everyone..
    is there any way to convert from String (as a class) to boolean (as a primitive type) ?
    thunx

    I used : Boolean.valueOf(s).booleanValue(); ,I got the same error.What same error? Surely not this one:
    cannot resolve simple in parseBoolean method??
    equals is OK, but I think it is not convert method,
    the prev. solutions by equals don't convert the value of s (String).Yes it does, for any reasonable definition of "converts". In fact, that is essentially how parseBoolean() is implemented. From the JDK 5.0 source code, class java.lang.Boolean:
         return ((name != null) && name.equalsIgnoreCase("true"));

  • String to boolean. Help needed.

    Hello ppl. Im here concerning my method for deleting files. I've got a bit of a difficulty....
    The method returns a String, becuase if an exception occurs it will return it, however if no exception occurs it returns true, as a String tho:
    return "true";
    Is there anyway to parse a string to a boolean value inside the method? or the invoking method?
    Method:
    public String delFile(String file){
    String error = null;
    File f = null;
    if(file!=null){
    try {
    f = new File(file);
    f.delete();
    } catch(SecurityException se){
    error = se.getMessage();
    if(error!=null) return error;
    return "true";
    Help appreciated. Thanks.

    Can I implement the custom exception method in the
    same class as the delFile() method?I think you got me wrong. You could do it like this:
    (1) Define your special exception class, which should
    be defined in a seperate file ("MyFileException.java")
    package myFileHandlingPackage;
    import java.io.*;
    public class MyFileException extends Exception{
    public final static int FILE_NOT_FOUND = 0;
    public final static int FILE_NAME_NULL = 1;
    public final static int NO_DELETION_PERMISSION = 2;
    private final static String[] messages;
    static{
       messages[] = new String[3];
       messages[0] = "The specified file could be found";
       messages[1] = "The file name was not specified";
       messages[2] = "You have no permission to delete the file";
    private int errorCode = -1;
    private File errorFile;
    public MyFileException(){
       super();
    public MyFileException(String msg){
       super(msg);
    public MyFileException(int errorCode, File errFile, String msg){
       MyFileException(msg);
       this.errorCode = errorCode;
       this.errorFile = errFile;
    public String getNiceMessage(){
       String niceMsg = "";
       if(errorCode != -1 && errorCode < 3){
         niceMsg += messages[errorCode];
         niceMsg += " ";
         niceMsg += errFile.getName();
       return niceMsg;
    }(2) import this class in your JSP and in the file you defined your
    delFile() method.
    (3) now you can use a catch(MyFileException mfe){...} in your JSP
    Hope that helps
    Adrian

  • How do u convert string to boolean?

    Hi ,
    Please find attached part of as vi. Global string is a global variable of string type. I would like to know how to connect it to the  rest of the block diagram. The case structure shown is of boolean type.The global string must display the color indicated in the case structure which  is red .
    Thanks
    SR
    Attachments:
    issue.ppt ‏81 KB

    If you do something like the attached picture, it will set the value of a string indicator and color the text either red or green. You are making things way too complicated and the code you've tried to implement isn't even close to what you want to accomplish and the Boolean to String isn't what was suggested in your other post on the subject.
    Message Edited by Dennis Knutson on 07-18-2006 12:22 PM
    Attachments:
    Set Text Color.JPG ‏8 KB

  • Convert string "true" to boolean?

    Hi,
    I have a string like this
    String test = "true";
    boolean bool = test.valueOf();
    Is there a way to convert my string to boolean or do i have to write a chunk of code like:
    if(test.equals("true")){
    bool = true;

    Hi,
    Thanks so much for the quick reply. I try that code and get:
    Error(): class valueOf not found in class java.lang.Boolean.....
    Is there something i am doing wrong.
    Thanks again

  • Boolean to String - surely there's an wasy way!

    How do i convert a boolean to its String represetation?
    This is how I do it:
    boolean primitiveBool = false;
    Boolean objectBool = new Boolean(primitiveBool);
    String booleanAsString = objectBool.toString();
    Surely there is a shorter more efficient way?
    Thanks.

    boolean bool = true;
    String asString = "" + bool;I think better would be Boolean.toString(boolean) or
    String.valueOf(boolean) as you're not creating an
    extra, unused String object.Plus a StringBuffer object.Moreimportantly (IMAO), the code is more directly expressing your intent. "Give me a String representation of this boolean" vs. "Give me a String that is a concatenation of the empty string and the string representation of this boolean."

  • Boolean to string convertion

    HI,
    Is there any tool in labview 8 to convert string to boolean or boolean to string . The source is of boolean type and the sink is boolean type.
    Thanks
    SR

    I don't know why you start a new thread instead of adding to your existing thread here:
    http://forums.ni.com/ni/board/message?board.id=170&message.id=193342
    In any case, most answers so far have dealt with formatting a boolean into a humanly readable string and back. Actually, I am not sure if that is what you want, because you talk about converting, not formatting.
    What exactly do you want to do?
    For example if you need to send a boolean via TCP, you need to convert it to a string, but it would make little sense to do any fancy formatting, turning a single byte into a longish humanly readable string. In this case you would just typecast to string, then cast it back to a boolean on the other end.
    The image shows one possibility.
    Message Edited by altenbach on 07-05-2006 10:40 AM
    LabVIEW Champion . Do more with less code and in less time .
    Attachments:
    Bool-string-bool.png ‏3 KB

  • Convert boolean to string

    hey
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    greets

    Bert600 wrote:
    Hey I found the easiest way I think:
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