Help! String to integer

Is there a way to map a string, like a name , into an integer that can be used as an array subscript?

Sounds messy. Maybe you want to use a hashtable provides ways to link a key (such as a name) to data. Look in the API under java.util.Hashtable.

Similar Messages

Typecasting string to integer. need help

Hi,
I have the following statement which returns a String but i need to convert to an integer .
properties.getProperty("MAXWIDTH");
Can i do it this way,
int width = (Integer) properties.getProperty("MAXWIDTH");
But it gives me error stating that it cannot convert string to integer.
Please help
Purnima

That's because the value returned from the
getProperty() method is a String. You can convert it
to an int, like this:int width =
Integer.parseInt(properties.getProperty("MAXWIDTH"));[
/code]oh so simple thanks
Purnima

Append String to Integer

Hi Guys,
I am trying to append a String to Integer like this;
String areacode = 020;
Integer phone_no = 21354214;
Integer full = areacode && phone_no;My problem is how to join the two datatypes to a single Integer value. Do anyone know how to go about this?
B

sabre150 wrote:
Skotty wrote:
Without debating the logic of doing such a thing...
Concatenate them as Strings, then convert that String back to an Integer.Your are on the top floor of the Eiffel Tower and a man is trying to climb over the safety netting but having trouble climbing the netting. You ask him why he is doing this and he says he has to get down to the ground as soon as possible but he has an irrational fear of lifts. Do you help him climb the safety netting or do you advise him that this is not a good idea and try to stop him?I get him to use my camera to take my picture.

Logic behind string to integer typecasting..

hi fourm,
i'm siva. i learnt typecasting in java. but i'm still wondering how the string to integer typecasting works, what is the logic behind this casting. somebody please help me out...
Advance thanking
siva

    public static int parseInt(String s) throws NumberFormatException {
     return parseInt(s,10);
    public static int parseInt(String s, int radix)
          throws NumberFormatException
        if (s == null) {
            throw new NumberFormatException("null");
     if (radix < Character.MIN_RADIX) {
         throw new NumberFormatException("radix " + radix +
                             " less than Character.MIN_RADIX");
     if (radix > Character.MAX_RADIX) {
         throw new NumberFormatException("radix " + radix +
                             " greater than Character.MAX_RADIX");
     int result = 0;
     boolean negative = false;
     int i = 0, max = s.length();
     int limit;
     int multmin;
     int digit;
     if (max > 0) {
         if (s.charAt(0) == '-') {
          negative = true;
          limit = Integer.MIN_VALUE;
          i++;
         } else {
          limit = -Integer.MAX_VALUE;
         multmin = limit / radix;
         if (i < max) {
          digit = Character.digit(s.charAt(i++),radix);
          if (digit < 0) {
              throw NumberFormatException.forInputString(s);
          } else {
              result = -digit;
         while (i < max) {
          // Accumulating negatively avoids surprises near MAX_VALUE
          digit = Character.digit(s.charAt(i++),radix);
          if (digit < 0) {
              throw NumberFormatException.forInputString(s);
          if (result < multmin) {
              throw NumberFormatException.forInputString(s);
          result *= radix;
          if (result < limit + digit) {
              throw NumberFormatException.forInputString(s);
          result -= digit;
     } else {
         throw NumberFormatException.forInputString(s);
     if (negative) {
         if (i > 1) {
          return result;
         } else {     /* Only got "-" */
          throw NumberFormatException.forInputString(s);
     } else {
         return -result;
    }Now where is the missing "logic".

Convert text box string into integer

i have an html file in which i m using a text box , for entering amount i m using that text box entry at next jsp. i want to convert amount string into integer for further processing. At next jsp i m using:-
String amount= request.getParameter("bal");
int ammount1= Integer.parseInt(ammount);
and in sql query i m using amount1 as:-
ResultSet rs1 = st.executeQuery("update saving set balance = balance - amount1 where saving.account_no = '" + acc +"'");
my problem is i m getting following error:-
server encountered an internal error and
exception:- numberformat exception
please help me as soon as possible

int ammount1= Integer.parseInt(ammount).toString();
good to put try block too..
try
int ammount1 = Integer.parseInt(ammount).toString();
catch(NumberFormatException e)
...}

Convert string to integer

package onjava;
import java.io.*;
import java.net.*;
import java.util.*;
import org.apache.soap.*;
import org.apache.soap.rpc.*;
import java.lang.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class CalcClient extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\"");
out.println("\"http://www.w3.org/TR/html4/loose.dtd\">");
out.println("<html>");
out.println("<head>");
out.println("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=iso-8859-1\">");
out.println("<title>Substraction using SOAP</title>");
out.println("</head>");
    URL url = new URL ("http://localhost/soap/servlet/rpcrouter");
Integer p1=request.getParameter("param1");
Integer p2=request.getParameter("param2");
In the above statement i have to convert the string to integer because that has to be passed in my program as an argument to a function so please let me know how to do that
    // Build the call.
    Call call = new Call();
    call.setTargetObjectURI("urn:onjavaserver");
    call.setMethodName("subtract");
    call.setEncodingStyleURI(Constants.NS_URI_SOAP_ENC);
    Vector params = new Vector();
    params.addElement(new Parameter("p1", Integer.class, p1, null));
    params.addElement(new Parameter("p2", Integer.class, p2, null));
    call.setParams (params);
    // make the call: note that the action URI is empty because the
    // XML-SOAP rpc router does not need this. This may change in the
    // future.
    Response resp = call.invoke(url, "" );
    // Check the response.
    if ( resp.generatedFault() ) {
      Fault fault = resp.getFault ();
     out.println("The call failed: ");
     out.println("Fault Code   = " + fault.getFaultCode());
     out.println("Fault String = " + fault.getFaultString());
    else {
      Parameter result = resp.getReturnValue();
      out.println(result.getValue());
out.println("</body>");
out.println("</html>");

Two possibilities: Try either java.lang.Integer.valueOf() or java.text.NumberFormat and its parse method.
Either one will do what you want. I think Integer will be the simpler of the two.
The code you have is obviously not correct, because getParameter returns a String:
Integer p1=request.getParameter("param1");Do it like this:
Integer p1=Integer.valueOf(request.getParameter("param1"));%

How to get the value of String in integer type

how to get the value of String in integer

{color:#0000ff}http://java.sun.com/javase/6/docs/api/java/lang/Integer.html#parseInt(java.lang.String)
http://java.sun.com/javase/6/docs/api/java/lang/Integer.html#valueOf(java.lang.String){color}

How to compare a string with integer in jsp

I have a field in database called as enddate
i m trying to split the entire date and get date,month and year
once i store the date in a variable called as fmdate which is string,
i need to compare it with another integer.
how can i compare it..heres my code
stdate=RS.getString("start_date");
     fmdate=stdate.substring(8,10);
     fmmonth=stdate.substring(5,7);
     fmyear=stdate.substring(0,4);
and this is where i want to compare the value of j to fmday...
<td class="btext" valign="center">Day<select name="fmday">
<%
for(int j=1;j<=31;j++)
String s;
parseInt(s)=j;
if (fmdate.equals(s))
%>
<option value="<%=j%>"><%=j%></option>
<% } else { %>
<option value="<%=j%>"><%=j%></option>
<%
} %>
</select>
pl help me...
Thanks Srini

j is an int, so you're just adding 0, not concatenating. Perhaps something like this would work.
<%
for(int j=1;j<=31;j++)
     String date = String.valueOf(j);
     if(j <= 9) {
        date = 0 + date;
     if (fmdate.equals(date)) {
%>
<option value="<%=date%>"><%=date%></option>
<%
     } else {
%>
<option value="<%=date%>"><%=date%></option>
<%
%>Uhm, I assume there should be a 'selected' or something in one of the option tags?

Converting time string to integer (****) in Labview 5.1

So i'm very new to labview, learning as i go, but as the title says, i
need to convert a time string to an ineger so that it can be placed in
an integer array which will be compiled then writen to file at a
specified end ( by user ) I just want 4 digits **** to indicate
military time. And unfortuanly i'm stuck with labview 5.1. Any help would be greatly appreciated.

I believe the diagram I have attached may have been possible in LV 5.1.
Try to wire this up and see if it works.
The icons may have changed a little between LV 5.1 and 6.1.
Ben
Message Edited by Ben on 10-15-2005 02:49 PM
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction
Attachments:
Mitary Time.JPG ‏19 KB

Trouble converting "double like" string to integer

Hi everyone,
I have a trouble here. Let's say I have a string which its value is "314.12345667". the value is "like a double". How do i convert it into an integer where the integer only takes the value of da string before the decimal point (as in the value of string = 314 only)? Thanks for helping.

hi xamule,
tey this..
String s="314.123876"
double d=Double.parseDouble(s);
int x=d.intValue();
hope it may help u..
bye bye,
Pramod

Logic of converting strings to integer

Hi all,
I know that , I can convert a string into a number using API , Ineger.parseInt() . But i want to know the reall algoritham behind that
.Can anybody explane that ?
Basically I am interested in
String s = "123";
int i = Integer.parseInt(s);
But i want to know what is the logic running behind this ?. Can anybody please help me. ...?
Thanks in advance....

The decompiled version parseInt() from Integer class
     * Parses the string argument as a signed decimal integer. The
     * characters in the string must all be decimal digits, except that
     * the first character may be an ASCII minus sign <code>'-'</code>
     * (<code>'\u002D'</code>) to indicate a negative value. The resulting
     * integer value is returned, exactly as if the argument and the radix
     * 10 were given as arguments to the
     * {@link #parseInt(java.lang.String, int)} method.
     * @param s        a <code>String</code> containing the <code>int</code>
     *             representation to be parsed
     * @return     the integer value represented by the argument in decimal.
     * @exception NumberFormatException if the string does not contain a
     *               parsable integer.
    public static int parseInt(String s) throws NumberFormatException {
     return parseInt(s,10);
     * Parses the string argument as a signed integer in the radix
     * specified by the second argument. The characters in the string
     * must all be digits of the specified radix (as determined by
     * whether {@link java.lang.Character#digit(char, int)} returns a
     * nonnegative value), except that the first character may be an
     * ASCII minus sign <code>'-'</code> (<code>'\u002D'</code>) to
     * indicate a negative value. The resulting integer value is returned.
     * <p>
     * An exception of type <code>NumberFormatException</code> is
     * thrown if any of the following situations occurs:
     * <ul>
     * <li>The first argument is <code>null</code> or is a string of
     * length zero.
     * <li>The radix is either smaller than
     * {@link java.lang.Character#MIN_RADIX} or
     * larger than {@link java.lang.Character#MAX_RADIX}.
     * <li>Any character of the string is not a digit of the specified
     * radix, except that the first character may be a minus sign
     * <code>'-'</code> (<code>'\u002D'</code>) provided that the
     * string is longer than length 1.
     * <li>The value represented by the string is not a value of type
     * <code>int</code>.
     * </ul><p>
     * Examples:
     * <blockquote><pre>
     * parseInt("0", 10) returns 0
     * parseInt("473", 10) returns 473
     * parseInt("-0", 10) returns 0
     * parseInt("-FF", 16) returns -255
     * parseInt("1100110", 2) returns 102
     * parseInt("2147483647", 10) returns 2147483647
     * parseInt("-2147483648", 10) returns -2147483648
     * parseInt("2147483648", 10) throws a NumberFormatException
     * parseInt("99", 8) throws a NumberFormatException
     * parseInt("Kona", 10) throws a NumberFormatException
     * parseInt("Kona", 27) returns 411787
     * </pre></blockquote>
     * @param      s   the <code>String</code> containing the integer
     *                representation to be parsed
     * @param      radix   the radix to be used while parsing <code>s</code>.
     * @return     the integer represented by the string argument in the
     *             specified radix.
     * @exception NumberFormatException if the <code>String</code>
     *              does not contain a parsable <code>int</code>.
    public static int parseInt(String s, int radix)
          throws NumberFormatException
        if (s == null) {
            throw new NumberFormatException("null");
     if (radix < Character.MIN_RADIX) {
         throw new NumberFormatException("radix " + radix +
                             " less than Character.MIN_RADIX");
     if (radix > Character.MAX_RADIX) {
         throw new NumberFormatException("radix " + radix +
                             " greater than Character.MAX_RADIX");
     int result = 0;
     boolean negative = false;
     int i = 0, max = s.length();
     int limit;
     int multmin;
     int digit;
     if (max > 0) {
         if (s.charAt(0) == '-') {
          negative = true;
          limit = Integer.MIN_VALUE;
          i++;
         } else {
          limit = -Integer.MAX_VALUE;
         multmin = limit / radix;
         if (i < max) {
          digit = Character.digit(s.charAt(i++),radix);
          if (digit < 0) {
              throw NumberFormatException.forInputString(s);
          } else {
              result = -digit;
         while (i < max) {
          // Accumulating negatively avoids surprises near MAX_VALUE
          digit = Character.digit(s.charAt(i++),radix);
          if (digit < 0) {
              throw NumberFormatException.forInputString(s);
          if (result < multmin) {
              throw NumberFormatException.forInputString(s);
          result *= radix;
          if (result < limit + digit) {
              throw NumberFormatException.forInputString(s);
          result -= digit;
     } else {
         throw NumberFormatException.forInputString(s);
     if (negative) {
         if (i > 1) {
          return result;
         } else {     /* Only got "-" */
          throw NumberFormatException.forInputString(s);
     } else {
         return -result;
    }

Converting String to integer?

I looked on the sun forums and only found a lot of things that convert integers to Strings. Nothing to do the opposite.
Does anyone know how I can convert a String to an int?

coopkev2 wrote:
an "A" from a "B"?? I don't understand what you are saying... I want to convert "100" to 100.
Edit-- I'll be back soon.Read "A" as "Integer" and "B" as "String".
In this case: read the [java.lang.Integer API|http://java.sun.com/javase/6/docs/api/java/lang/Integer.html] if there is a method which takes a String and returns an Integer or int.

Question about reading a string or integer at the command line.

Now I know java doesn't have something like scanf/readln buillt into it, but I was wondering what's the easiest, and what's the most robust way to add this functionality? (This may require two separate answers, sorry).
The reason I ask is because I've been learning java via self study for the SCJA, and last night was the first time I ever attempted to do this and it was just hellish. I was trying to make a simple guessing game at the command line, I didn't realize there wasn't a command read keyboard input.
After fighting with the code for an hour trying to figure it out, I finally got it to read the line via a buffered reader and InputStreamReader(System.in), and ran a try block that threw an exception. Then I just used parseInt to get the integer value for the guess.
Another question: To take command line input, do you have to throw an exception? And is there an easier way to make this work? It seems awfully complicated to take user input without a jframe and calling swing.
Edited by: JGannon on Nov 1, 2007 2:09 PM

1. Does scanner still work in JDK1.6?Try it and see. (Hint: the 1.6 documentation for the class says "Since: 1.5")
If you get behaviour that doesn't fit with what you expect it to do, post your code and a description of our expectations.
2. Are scanner and console essentially the same thing?No.
Scanner is a class that provides methods to break up its input into pieces and return them as strings and primitive values. The input can be a variety of things: File InputStream, String etc (see the Scanner constructor documentation). The emphasis is on the scanning methods, not the input source.
Console, on the other hand, is for working with ... the console. What the "console" is (and whether it is anything) depends on the JVM. It doesn't provide a lot of functionality (although the "masked" password input can't be obtained easily any other way). In terms of your task it will provide a reader associated with the console from which you can create a BufferedReader and proceed as you are at the moment. The emphasis with this class is the particular input source (and output destination), not the scanning.
http://java.sun.com/javase/6/docs/api/java/util/Scanner.html
http://java.sun.com/javase/6/docs/api/java/io/Console.html

Help with passing integer value in A.S.S

I get an NSinternal script error while trying to pass this value can anyone help?
Also I wonder if it is possible to pass the value to a matrix
on clicked theObject
tell button "checkbox" of window 1
if integer value = 1 then
set button "checkbox2" of window 1 to integer value = 1
else
set integer value to 0
end if
end tell
end clicked
I also tried:
if state of button "checkbox" of window1 is 1 then
set the state of button "checkbox2" of window1 to 1
end if
Message was edited by: Doug Bassett

I've been following this thread and trying to figure out how to make this work. I was getting inconsistent results or errors with most of the code that has been posted. But I finally got it working... at least on a Leopard machine (not sure if this could have changed between Tiger and Leopard so your mileage may vary).
What I found was that a checkbox button that's located directly in a window seems to have a state that's equal to 0 when it's unchecked and 1 when it's checked. But a checkbox cell that's contained within a matrix seems to have a state that's set to either _off state_ or _on state_. Trying to set a cell's state to 0 or 1 simply wasn't working right for me. So I get the state of the "selectall" checkbox button (which is a 0/1) and transform it to either "off state" or "on state" before setting the states of the checkbox cells in the matrix.
Here's my code:
on clicked theObject
set n to name of theObject
if n = "selectall" then
set s to state of theObject
log "state: " & s
if s = 0 then
set newState to off state
else
set newState to on state
end if
repeat with i from 1 to count of cells of matrix "directories" of window "main"
tell cell i of matrix "directories" of window "main"
set state to newState
end tell
end repeat
return
end if
if n = "logStatesBtn" then
logStates()
return
end if
end clicked
on logStates()
log "Logging states:"
set s to state of button "selectall" of window "main"
log "selectall checkbox: " & s
repeat with i from 1 to count of cells of matrix "directories" of window "main"
tell cell i of matrix "directories" of window "main"
set s to state
end tell
log "Cell " & i & ": " & s
end repeat
end logStates
Note the "logStates" handler is just something I connected up to a "logStatesBtn" button in my window that lets me spit out the states of all the checkboxes into the console log. This is how I actually discovered that the cells were set to "off state" or "on state".
Steve

Parsing a string to integer gives 0 in Integer

Hi ,
try
usid = Integer.valueOf(usi).intValue();
catch(NumberFormatException e)
text = "NUMber";
in the above code the value of usi is 4
then parsing it is giving me 0 in usid
try
usid = Integer.parseInt(usi);
catch(NumberFormatException e)
text = "NUMber";
I also tried the above code the result is same

Also the OP didn't say which version of JDK he was using.
With JavaSE5 and JavaSE6 , there's a new feature called autoboxing , which eliminates the need to cast from a String to an Integer , and then to get an int value .
Insead one could simply write code like this and i works:
Integer someInteger = 123;
int anInt = 555;
someInteger = anInt;
anInt = someInteger;Autoboxing and Autounboxing : http://java.sun.com/j2se/1.5.0/docs/guide/language/autoboxing.html
But the article further adds:
So when should you use autoboxing and unboxing? Use them only when there is an �impedance mismatch� between reference types and primitives, for example, when you have to put numerical values into a collection. It is not appropriate to use autoboxing and unboxing for scientific computing, or other performance-sensitive numerical code. An Integer is not a substitute for an int; autoboxing and unboxing blur the distinction between primitive types and reference types, but they do not eliminate it.
Message was edited by:
appy77

Help! String to integer

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