Creating Stack Of String & Array???

How can I create a stack of strings and use arrays as internal storage mechanism??n Is it possible to make a stack that can take in a text file?? thanks in advance.:):)

Of course, if you want a Stack that's better than java.util.Stack, all you have to do is
public interface Stack {
   public abstract boolean isEmpty();
   public abstract void push(Object newItem);
   public abstract Object pop();
import java.util.*;
public final class LinkedStack implements Stack {
   private LinkedList data = new LinkedList();
   public boolean isEmpty() {
      return data.size() == 0;
   public void push(Object newItem) {
      data.addLast(newItem);
   public Object pop() {
      if (isEmpty()) return null;
      return data.removeLast();
}Implementation of ArrayStack is left as an exercise for the reader.

Similar Messages

How to dynamically create a JSF dataTable from a String[][] array

Hi, I�m developing an application that uses columns, rows and data instead of any other attributes, so I got from a database Resultset a String[] array with the rows headers, other String[] array with the columns headers, and a String[][] array with the information between every row[] and column[] header al this String arrays depend on a method that receives the group title as a parameter so they are dynamically created, anyway I can display this information in a jsp page but I don�t know how to display this information in a JSF dataTable.
Does anybody knows how I could do this? and which is the proper way to create a dynamically rows and columns dataTable?

Hi, I�m developing an application that uses columns, rows and data instead of any other attributes, so I got from a database Resultset a String[] array with the rows headers, other String[] array with the columns headers, and a String[][] array with the information between every row[] and column[] header al this String arrays depend on a method that receives the group title as a parameter so they are dynamically created, anyway I can display this information in a jsp page but I don�t know how to display this information in a JSF dataTable.
Does anybody knows how I could do this? and which is the proper way to create a dynamically rows and columns dataTable?

How to avoid NullPointerException---String array created from JTextArea

Hi,
I use the method getText() to put the contents of a JTextArea into a String object. Then I use split("\\s+") on that String object to get a String array. Before the contents of the String array are output, I get a NullPointerException. How do I avoid this exception? My code is below.
//: net/mindview/util/SwingConsole.java
package net.mindview.util;
import javax.swing.*;
public class SwingConsole {
public static void
run(final JFrame f, final int width, final int height) {
    SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        f.setTitle(f.getClass().getSimpleName());
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(width, height);
        f.setVisible(true);
} ///:~
//: gui/Charts.java
package gui;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import net.mindview.util.SwingConsole;
public class Charts extends JFrame {
    private int[] numbers;
    private JTextArea input = new JTextArea();
    private JScrollPane areaScrollPane = new JScrollPane(input);
    private JButton b1 = new JButton("Submit");
    private JButton b2 = new JButton("Clear");
    public Charts() {
        add(areaScrollPane);
        areaScrollPane.setPreferredSize(new Dimension(250, 250));
        b1.addActionListener(a1);
        b2.addActionListener(a2);
        add(b1);
        add(b2);
    private ActionListener a1 = new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            String data = input.getText();
            String[] stringArray = data.split("\\s+");
            for (String s:stringArray)
                System.out.print(s + " ");
            int i = 0;
            for (String s:stringArray)
                numbers=Integer.parseInt(s);
i++;
private ActionListener a2 = new ActionListener() {
public void actionPerformed(ActionEvent e) {
input.setText("");
* @param args the command line arguments
public static void main(String[] args) {
// TODO code application logic here
SwingConsole.run(new Charts(), 400, 400);
Edited by: gluedtothecomputer on Feb 1, 2009 7:59 PM

don't forget to init your int array:
      String[] stringArray = data.split("\\s+");
      numbers = new int[stringArray.length];

Creating Stack, HELP, urgent

- need to create a stack from an array, which is at a fixed size of 50, and the stack class cannot be used, or vectors
public StackClass(int size)
public boolean push(String input)
- returns true if pushed, and should push a string onto stack
public String pop()
- returns String top of stack, deletes if from stack
public boolean empty()
-says if there is anything in the stack
public String ontop()
- returns string on top of the stack
- i have tried to write these methods numerous times, and am having serius difficulties since i am new to java,
thanks for the help

class StackClass{
private String arr[];
private int top;
pirvate int s;
StackClass(int size){
arr=new String[size];
s=size;
public boolean push(String input){
if(top==s)
return false
arr[top++]=input;
return true;
public String pop(){
if(top!=0)
return arr[--top];
return null;
public boolean empty(){
if(top!=s)
return true;
return false;
public String onTop(){
return arr[top-1];
}

How to add elements into java string array?

I open a file and want to put the contents in a string array. I tried as below.
String[] names;
s = new Scanner(new BufferedReader(new FileReader("outfile.txt")));
while (s.hasNext()) {
                String item = s.next();
                item.trim();
                email = item;
                names = email;
            }But I know that this is a wrong way of adding elements into my string array names []. How do I do it? Thanks.

Actually you cannot increase the size of a String array. But you can create a temp array with the lengt = lengthofarray+1 and use arraycopy method to copy all elements to new array, then you can assign the value of string at the end of the temp array
I would use this one:
String [] sArray = null;
s = new Scanner(new BufferedReader(new FileReader("outfile.txt")));
while (s.hasNext()) {
    String item = s.next();
    item.trim();
    email = item;
    sArray = addToStringArray(sArray, email);
* Method for increasing the size of a String Array with the given string.
* Given string will be added at the end of the String array.
* @param sArray String array to be increased. If null, an array will be returned with one element: String s
* @param s String to be added to the end of the array. If null, sArray will be returned.(No change)
* @return sArray increased with String s
public String[] addToStringArray (String[] sArray, String s){
     if (sArray == null){
          if (s!= null){
               String[] temp = {s};
               return temp;
          }else{
               return null;
     }else{
          if (s!= null){
               String[] temp = new String[sArray.length+1];
               System.arraycopy(sArray,0,temp,0,sArray.length);
               temp[temp.length-1] = s;
               return temp;
          }else{
               return sArray;
}Edited by: mimdalli on May 4, 2009 8:22 AM
Edited by: mimdalli on May 4, 2009 8:26 AM
Edited by: mimdalli on May 4, 2009 8:27 AM

String Array Constant Addition

Is there an elegant way of marking the last element in a string array
constant? i.e. I take an Array constant, and add a simple string to it,
so that it becomes a String Array Constant. Now I add elements 1 and 2
and 3. But now I want to take element 3 out. If I just delete Element 3
contents from the string control, that is fine, but the # of Array
elements is still 3. It is just that the 3rd elelment is null. How can I
make the array length 2? Now I know that starting over is one option
(just creat a new array constant, and add the two elements) but what if
my array constant has 100 elements and I want to make it 99. I also
know that programatically I can remove these elelents, but I am taking
about in the programming of th
is constant. I must be over looking
something... Any ideas???
Sent via Deja.com http://www.deja.com/
Before you buy.

[email protected] wrote:
> Is there an elegant way of marking the last element in a string array
> constant? i.e. I take an Array constant, and add a simple string to it,
> so that it becomes a String Array Constant
Arrays must be all the same type. If the last element is a constant, all
elements are
> Now I add elements 1 and 2
> and 3. But now I want to take element 3 out. If I just delete Element 3
> contents from the string control, that is fine, but the # of Array
> elements is still 3. It is just that the 3rd elelment is null.
In a string, yes, Empty strings are essentially nulls.
> How can I
> make the array length 2? Now I know that starting over is one option
> (just creat a new array constant, and add the two elements) but what if
> my array cons
tant has 100 elements and I want to make it 99. I also
> know that programatically I can remove these elelents, but I am taking
> about in the programming of this constant. I must be over looking
> something... Any ideas???
This is one of my problems. It is easy to size an array up, but hard to size
down.
Of course you can resize at run time but the only way I know to do this
when editing is to start over.
Kevin Kent
Attachments:
Kevin.Kent.vcf ‏1 KB

Write Spreadsheet to String Array on another worksheet

hi,
is it possible to write spreadsheet to string array but to an added worksheet?
I am currently writing results to the worksheet, but i want to create another worksheet so that i can put the raw data in.
is it possible?
if so, how?
Best regards,
Krispiekream
Solved!
Go to Solution.

Sorry,
i guess i attached the wrong picture.
i currently have this.
I read from a spreadsheet.
and analysis certain row and column, then do calculation and write the results to a new spreadsheet.
it is working fine.
but as an option. i wanted to "read all the data from the spreadsheet as the previous image" and then write those data to the same new spreadsheet file but in a different worksheet.
Best regards,
Krispiekream

Newbie trying to sort 2D string array

Dear all,
After read some book chapters, web sites including this, I still don't get the point.
If I have a file like,
1 aaa 213 0.9
3 cbb 514 0.1
2 abc 219 1.3
9 bbc 417 10.4
8 dee 887 2.1
9 bba 111 7.1
and I load into memory as a String[][]
here comes the problem, I sort by column 1 (aaa,...,bba) using an adaptation of the Quicksort algorithm for 2D arrays
* Sort for a 2D String array
* @param a an String 2D array
* @param column column to be sort
public static void sort(String[][] a, int column) throws Exception {
QuickSort(a, 0, a.length - 1, column);
/** Sort elements using QuickSort algorithm
static void QuickSort(String[][] a, int lo0, int hi0, int column) throws Exception {
int lo = lo0;
int hi = hi0;
int mid;
String mitad;
if ( hi0 > lo0) {
/* Arbitrarily establishing partition element as the midpoint of
* the array.
mid = ( lo0 + hi0 ) / 2 ;
mitad = a[mid][column];
// loop through the array until indices cross
while( lo <= hi ) {
/* find the first element that is greater than or equal to
* the partition element starting from the left Index.
while( ( lo < hi0 ) && ( a[lo][column].compareTo(mitad)<0))
++lo;
/* find an element that is smaller than or equal to
* the partition element starting from the right Index.
while( ( hi > lo0 ) && ( a[hi][column].compareTo(mitad)>0))
--hi;
// if the indexes have not crossed, swap
if( lo <= hi )
swap(a, lo, hi);
++lo;
--hi;
/* If the right index has not reached the left side of array
* must now sort the left partition.
if( lo0 < hi )
QuickSort( a, lo0, hi, column );
/* If the left index has not reached the right side of array
* must now sort the right partition.
if( lo < hi0 )
QuickSort( a, lo, hi0, column );
* swap 2D String column
private static void swap(String[][] array, int k1, int k2){
String[] temp = array[k1];
array[k1] = array[k2];
array[k2] = temp;
----- end of the code --------
if I call this from the main module like this
import MyUtil.*;
public class kaka
public static void main(String[] args) throws Exception
String[][]a = MyUtil.fileToArray("array.txt");
MyMatrix.printf(a);
System.out.println("");
MyMatrix.sort(a,1);
MyMatrix.printf(a);
System.out.println("");
MyMatrix.sort(a,3);
MyMatrix.printf(a);
for the first sorting I get
1 aaa 213 0.9
2 abc 219 1.3
9 bba 111 7.1
9 bbc 417 10.4
3 cbb 514 0.1
8 dee 887 2.1
(lexicographic)
but for the second one (column 3) I get
3 cbb 514 0.1
1 aaa 213 0.9
2 abc 219 1.3
9 bbc 417 10.4
8 dee 887 2.1
9 bba 111 7.1
this is not the order I want to apply to this sorting, I would like to create my own one. but or I can't or I don't know how to use a comparator on this case.
I don't know if I am rediscovering the wheel with my (Sort String[][], but I think that has be an easy way to sort arrays of arrays better than this one.
I've been trying to understand the Question of the week 106 (http://developer.java.sun.com/developer/qow/archive/106/) that sounds similar, and perfect for my case. But I don't know how to pass my arrays values to the class Fred().
Any help will be deeply appreciated
Thanks for your help and your attention
Pedro

public class StringArrayComparator implements Comparator {
int sortColumn = 0;
public int setSortColumn(c) { sortColumn = c; }
public int compareTo(Object o1, Object o2) {
    if (o1 == null && o2 == null)
      return 0;
    if (o1 == null)
      return -1;
    if (o2 == null)
      return 1;
    String[] s1 = (String[])o1;
    String[] s2 = (String[])o2;
    // I assume the elements at position sortColumn is
    // not null nor out of bounds.
    return s1[sortColumn].compareTo(s2[sortColumn]);
// Then you can use this to sort the 2D array:
Comparator comparator = new StringArrayComparator();
comparator.setSortColumn(0); // sort by first column
String[][] array = ...
Arrays.sort(array, comparator);I haven't tested the code, so there might be some compiler errors, or an error in the logic.

Converting vector to string array

How can I convert values in a vector into a string array?
Vector formsVector = new Vector();
while (rs.next())
{formsVector.add(rs.getString("forms"));}
String forms[] = (String[])formsVector.toArray();
I tried the above line but it did not work. Any input please?
Thanks

.... What is the difference between the two as
according to online help, both are same.
String forms[] = (String [])formsVector.toArray();
String forms[] = (String [])formsVector.toArray( new
String[0] );The difference lies in the type of the object returned from toArray. The first form you list, formsVector.toArray(), always returns an Object[]. In your example, you'll get a ClassCastException at runtime when you cast to String[].
The second form will try to use the array you pass in. If it's not big enough, it'll create a new one of the same type as that array. This is what's happening when passing a zero-length array into toArray.
My personal preference is to save an extra instantiation and build the array to the proper size to begin with:String forms[] = (String [])formsVector.toArray( new String[formsVector.size()] );

How to Pass String array from Java to PL/SQL and this use in CURSOR

hi,
I cant understand how to pass Array String as Input Parameter to the Procedure and this array use in Cursor for where condition like where SYMPTOM in( ** Array String **).
This array containing like (SYMPTOM ) to be returned from the java to the
pl/sql (I am not querying the database to retrieve the information).
I cannot find an example on this. I will give the PL/SQL block
create or replace procedure DISEASE_DTL<*** String Array ***> as
v_SYMPTOM number(5);
CURSOR C1 is
select distinct a.DISEASE_NAME from SYMPTOM_DISEASE_RD a
where ltrim(rtrim(a.SYMPTOM)) in ('Fever','COUGH','Headache','Rash') ------- ***** Here use this array element(like n1,n2,n3,n4,n5..) ******
group by a.DISEASE_NAME having count(a.DISEASE_NAME) > 3 ----------- ***** 3 is no of array element - 1 (i.e( n - 1))*****
order by a.DISEASE_NAME ;
begin
for C1rec IN C1 loop
select count(distinct(A.SYMPTOM)) into v_SYMPTOM from SYMPTOM_DISEASE_RD a where A.DISEASE_NAME = C1rec.DISEASE_NAME;
insert into TEMP_DISEASE_DTLS_SYMPTOM_RD
values (SL_ID_SEQ.nextval,
C1rec.DISEASE_NAME,
(4/v_SYMPTOM), --------**** 4 is no of array element (n)************
(1-(4/v_SYMPTOM)));
end loop;
commit;
end DISEASE_DTL;
Please give the proper solution and step ..
Thanking you,
Asish

I've haven't properly read through your code but here's an artificial example based on a sql collection of object types - you don't need that, you just need a type table of varchar2 rather than a type table of oracle object type:
http://orastory.wordpress.com/2007/05/01/upscaling-your-jdbc-app/

Help! Inserting a 1-D comment array into a 2-D string array at specified row AND column

Hello everyone,
I am writing a 2-D string array to excel and i need a way to add comments to my file like this:
SLAM NAME G Level Comments
1 RALF 26
1 RALF 26
1 RALF 26
1 RALF 26
For some reason, i cannot specify a row AND column to write because:
When i use replace array subset it only replaces 1 element at my index.
When i use replace array subset with a loop, it creates empty spaces until it reaches the end of the array it is replacing.
When i use Insert into array: i cannot wire 2 inputs for row and column.
In my complete VI i will need to write from row 1-1001, a different comment from 2-2002, a different comment from 3-3003, etc until a stop condition is met so i need to figure out how to do this programatically and not have it replace any elements outside of the range or it will override previous commetns.
I am at a loss of what to do. Any and all suggestions are greatly appreciated.
Thanks!
Solved!
Go to Solution.
Attachments:
array.vi ‏13 KB

Hi proph,
I made a small subtile change to yur VI and now it replaces all values of the 4th column…
THINK DATAFLOW!
Use shift registers when you need to propagate values from one loop iteration to the next!
USE/LEARN DEBUGGING TECHNIQUES!
There are tools like probes and highlight to understand your VI execution and to find problems…
Go through all those free online courses offered by NI!
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome
Attachments:
array.vit ‏12 KB

External java function that should return String array

Hi everyone,
I have a split function in plsql that takes 10 times longer a java tokenizer function that i was written. So, i want to use java external function to split my plsql strings into pieces.
I can write a java external procedure that returns types like int, float and String types. I have no problem about it.
My problem is returning an array of strings. I found a book that has an example about how can we get directory list in plsql with java external procedure.
(code)
import java.io.File;
import java.sql.*;
import oracle.sql.*;
import oracle.jdbc.*;
public class JFile {
public static oracle.sql.ARRAY dirlist (String dir)
throws java.sql.SQLException
Connection conn = new OracleDriver().defaultConnection( );
ArrayDescriptor arraydesc =
ArrayDescriptor.createDescriptor ("DIRLIST_T", conn);
File myDir = new File (dir);
String[] filesList = myDir.list( );
ARRAY dirArray = new ARRAY(arraydesc, conn, filesList);
return dirArray;
CREATE OR REPLACE FUNCTION dirlist (dir IN VARCHAR2)
RETURN dirlist_t
AS
LANGUAGE JAVA
NAME 'myFile.dirlist(java.lang.String) return oracle.sql.ARRARY';
(code)
I could compile this source file in localhost but not remotehost. There are jar files ( import oracle.sql.*; import oracle.jdbc.*; ) that should be added to remote classpath. ( others have already added java classpath ). But, which classpath i should add? Oracle has own JVM and Classpath, probably i should upload these jar files to oracle classpath. Am i wrong? How can i do? Can you explain in detail? How can i return string array from java external function in Oracle ?
I am using Oracle 11.1.0.7 on Solaris Sparc Machine.

Hi,
What do you mean "compile in remote host"
Aren't you using the loadjava tool? - that should be enough, the RDBMS already "has" the jars needed.
[A must read|http://download.oracle.com/docs/cd/B28359_01/java.111/b31225/chone.htm#BABCFIIF]
Regards
Peter

WebService problem: only the first element of a string array is returned

Hello,
i did the J2EE QuickCarRental tutorial and extended it by some features: I created another entity bean and implemented four new methods in the QuickOrderProcessor. Then i deployed it as a WebService and accessed it using the Visual Composer.
Everything works fine except the return value of one WebService method. I created a method with the return value String[]. But the Visual Composer reads it as String. Only the first element of the resulting string array is displayed. Although the test at the web-page http://<server>:<port>/QuickCarRentalService/Config1 displays the whole string array with all its elements. What did i wrong?
Another problem is that after deploying the J2EE-Application with new WebService methods the changes are not visible inside the visual composer. Although the test at the web-page http://<server>:<port>/QuickCarRentalService/Config1 displays the changes. Do i have to restart the WebService system in the portal content? If yes how can i do that?

Here are details about setting up and using web services and some examples:
/people/prakash.darji/blog/2006/10/10/external-web-service-proxy-configuration-for-visual-composer

Creating a Two Dimensional Array in Xcode and populating it with a values f

Whats the easiest way to declare a two dimensional array in Xcode. I am reading an matrix of numbers from a text file from a website and want to take the data and place it into a 3x3 matrix.
Once I read the URL into a string, I create an NSArray and use the componentsSeparatedByString method to strip of the carriage return line feed and create each individual row. I then get the count of the number of lines in the new array to get the individual values at each row. This will give mw an array with a string of characters, not a row of three individual values. I just need to be able to take these values and create a two dimensional array.

I'm afraid you are in the wrong place. Look here for the last two forums on programming. However, XCode support is mostly found at developer.apple.com. You can access their forums by registering. Registration is free.

Pass string array to Oracle function from Web page

Hi. I need to pass a two-dimensional array of string values to an Oracle function from an ASP.NET page. Is there an efficient way to accomplish this? I'm thinking I'll have to create a long string with special delimiters,
|12345^4.000|67890^3.670|.....
I'd parse the string on Oracle and break it into its component parts. In this example, each "record" is separated by the bar "|" and each field is separated by the up arrow "^". So each record has two fields.
Is this a good approach? Your input is much appreciated. Thanks.

In PL/SQL, it is easy enough to define a record type with two attributes and declare a store procedure that takes in an array of those parameters. I know that from Java it is possible to create and pass in such an array. I would suspect that the same is possible from .Net but I am not a competent .Net developer.
Justin

Creating Stack Of String & Array???

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