Compare two strings in an array
Hello!
Please feel free to give me hints, but do not give me any code.
Ok, here is what I am trying to do, I whant to compare my input string whith strings allready stored in the array. If my input string equals any of the allready excisting strings, a error wil show upp, otherwise store the new string in next avalibal position. I do not seem to get the method right for comparing the strings. here is the method I have written so far, please take a look and give me a hint, but no code. :)
//Check if a user already excists
public void compareNames (People in_array [], String in_name) {
for (int i=0; i<value.peopleCount; i++) {
if (in_name.equals(in_array.getPeople())) {
System.out.print("The user already excist, please chose another name");
}value.peopleCount is an global count value for people arays.
getPeople get the name from the people class.
Martin
A couple notes here.
The name compareNames() is misleading if it is going to do what you described. A comparison will generally not have side-effects like outputting error messages to the console or adding new items to an array. It would be better if you called the method addIfNew(), and returned a boolean indicating whether the name was new or not. The caller would then be responsible for displaying an error message if the method returned false.
I also suggest you use a List such as ArrayList instead of an array, otherwise you will have to resize and copy your array every time you add something to it that exceeds the array size, and will allow you to do away with the global peopleCount.
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say I had names like paul Duncan, George Morrison.
I have split them up so its now paul , duncan i then use the users entered string to compare it against the name name to see if it matches anything in the first name or the last name if it does i added it to an arraylist.
however i have tried t use a indexof as i believe this looks for similarity (Substring matches?) but it always returns -1.
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eg user enters pa
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thanks for any helpthank you for the reply
Sorry I forgot to put in the code.
This is a reduced down version including the read in from a text file as well as the index of if statement and the adding of it to an array list.
public class FindContact {
String res;
/** Creates a new instance of FindContact */
public FindContact() {
public Object[] FindAUser(String passSearch) {
System.out.println("getting here");
ArrayList found = new ArrayList();
String patternStr = ",";
int j, i = 0;
try {
BufferedReader in = new BufferedReader(new FileReader("H:\\out.txt"));
String str;
while ((str = in.readLine()) != null) {
String[] fields = str.split(patternStr);
//for(j=0;j < fields.length;j++) {
if (fields.length != 0) {
if (passSearch.indexOf(fields[0])!=-1 || passSearch.indexOf(fields[1])!=-1) {
found.add(str);
System.out.println("ENDDDDDDDD value ");
in.close();
} catch (IOException e) {
System.out.println(e.toString());
Object[] foundResult = new Object[found.size()];
foundResult = found.toArray();
if (foundResult.length >= 0) {
System.out.println(foundResult.length);
return foundResult;
Hope that helps as it has confused me and am not sure why it is not returning a value.
Should I maybe use the contain method instead to search for the user inputted string? -
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Hi All,
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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TextCounterPanel extends JPanel {
private JTextArea textInput;
private JLabel lineCountLabel;
public TextCounterPanel() {
setBackground(Color.DARK_GRAY);
textInput = new JTextArea();
textInput.setBackground(Color.WHITE);
JPanel south = new JPanel();
south.setBackground(Color.DARK_GRAY);
south.setLayout( new GridLayout(4,1,2,2) );
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setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY));
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add(scroller, BorderLayout.CENTER);
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public void processInput() {
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How can I compare two string in different line in text areaimport java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TextCounterPanel extends JPanel {
private JTextArea textInput;
private JLabel lineCountLabel;
public TextCounterPanel() {
setBackground(Color.DARK_GRAY);
textInput = new JTextArea();
textInput.setBackground(Color.WHITE);
JPanel south = new JPanel();
south.setBackground(Color.DARK_GRAY);
south.setLayout( new GridLayout(4,1,2,2) );
JButton countButton = new JButton("Process the Text");
countButton.addActionListener( new ActionListener() {
public void actionPerformed(ActionEvent evt) {
processInput();
south.add(countButton);
lineCountLabel = new JLabel(" Number of lines:");
lineCountLabel.setBackground(Color.WHITE);
lineCountLabel.setForeground(Color.BLUE);
lineCountLabel.setOpaque(true);
south.add(lineCountLabel);
setLayout( new BorderLayout(2,2) );
setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY));
JScrollPane scroller = new JScrollPane( textInput );
add(scroller, BorderLayout.CENTER);
add(south, BorderLayout.SOUTH);
public void processInput() {
String text,vin; // The user's input from the text area.
text = textInput.getText();
vin =text.substring(25,42);
lineCountLabel.setText(" vin: " + vin);
} // end class TextCounterPanel -
Compare two strings in a formula
Hi,
I'd like to know if there's a way to compare two strings in a formula ?
I have this consition:
IF(@SUBSTRING(@NAME(@CURRMBR(TIME_FROM)),5)==@NAME(@CURRMBR(TIME)))
But the == operator can only compare two data.
Thanks,
CyrilHi,
thank you both for your answers.
When I figured that the == operator was for data only, I didn't even try to compare member names.
I finally used the solution that Cameron suggested in another conversation. I created a date measure, and loaded some data since the beginning of my time to the end.
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Note that I could have also used the @TODATE function, which turns a date into a number, but the format of date is limited and doesn't fit the format of my member names, so I got lasy... and I'm not sure my users would have apreciated that ;)
Thanks, this post is solved.
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Compare two strings and the save the greater
To devolop a vi,it can compare two strings.A string is gived,the other is saved previously.If greater,then save,or do nothing.
Hi,
I am assuming by "greater" you mean the string length.
Use the string length function from the strings palette, with shift-registers on a while loop. Write to the shift-register the "greater" string.
I am attaching a diagram screenshot for this. NOTE: depending on how you want this VI to run, you can move the input and output string control and indicator inside our outside the while loop.
Hope this is what you were looking for.
Khalid
Attachments:
strlen.gif 17 KB -
I attempted to compare two strings whether they are equal or not. They should return true if both are equal.
One string is based on Taxonomy's Term (i.e. Term.Name) whereas other string is based on String object.
The problem is that both strings which seem equal return false instead of true. Both string values have different special characters though their special characters are ＆ and &
Snapshot of different design & same symbols:
Is it due to different culture or language?
How to compare two strings whether both are equal while ignoring the difference in special characters (＆ vs &)?Hi Jerioon,
If you have a list of possible ambiguous characters the job is going to be easy and if (＆ vs &) are the only charracters in concern awesome.
You can use the below solution.
Before comparing pass the variables through a replace function to standarize the char set.
$Var = Replace($Var,"＆","&")
This is going to make sure you don't end up with ambiguous characters failing the comparison and all the char are "&" in this case.
Similar technique is used to ignore Character Cases 'a' vs. 'A'
Regards,
Satyajit
Please “Vote As Helpful”
if you find my contribution useful or “Mark As Answer” if it does answer your question. That will encourage me - and others - to take time out to help you. -
How do you check to see if two strings have dashes in the same places?
For example:
String one= "dfsdt-ra-s-dsfd";
String two= "dsfst-da-s-dsfd";
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String one="jhsdjfk-dsf-sdf"
String two="d-dsf-dfsf-f"
would return false.
This is what i have:
if (one.indexOf("-") == two.indexOf("-")) {
return true;
The problem with this if statement is it only checks the first time the dash come and not the whole string.
How can I check the whole string to compare the index of string one and string two every time the dash come up.Hey,
Check this code out, compile it and you should get it. Let me know if you have any questions.
Thanks
Riz
public class StringCheck {
String s1;
String s2;
boolean AreEqual;
int lens1,lens2;
public StringCheck(){
s1="dfsdt-ra-s";
s2="dfsdt-ra-s";
AreEqual=false;
lens1=s1.length();
lens2=s2.length();
public boolean CheckTheString(){
boolean localcheck=false;
if(lens1==lens2){
for(int i=0;i<lens1;i++){
if(s1.charAt(i)==s2.charAt(i)){
localcheck=true;
i++;
if(s1.charAt(i)!=s2.charAt(i)){
return false;
if(localcheck)return true;
else return false;
//return true;
public static void main(String args[]){
StringCheck c = new StringCheck();
boolean validate=c.CheckTheString();
if(validate)
System.out.println("The string are equal");
else
System.out.println("The String are not equal");
} -
Compare two strings and verify they have same alphabets
If i have two strings....s and t. I want to return whether s contains every letter in t. For example, "abcd" contains all the letters in "bbdc", since every letter in the second string appears in teh first.
thanxIf i have two strings....s and t. I want to return
whether s contains every letter in t. For example,
"abcd" contains all the letters in "bbdc", since every
letter in the second string appears in teh first.This will do the job in s.length()*t.length() steps.
// Indicates whether s contains every letter in t.
boolean allCharsContainedIn(String s, String t) {
int len = t.length();
for (int i = 0; i < len; i++) {
if (s.indexOf(t.charAt(i) == -1)
return false;
return true;
}Søren -
String s1 = "ABC";
String s2 = "ABC";
*if (s1 == s2){* //This tests true
*if (s1.equals(s2)){* //This tests true
*if (s1.equalsIgnoreCase(s2)){*//This tests true
My understanding is s1 refers one String object with the value ("ABC"); while s2 refers another String object with the value ("ABC"); So s1 and s2 actually refers to different objects.
Is this correct?
If so why the above test true?
Thanks
ScottJust to dig a little further...
For
String s1 = "ABC";
and
String s1 = new String("ABC");
You mentioned:
if((Object)s1 == (Object)s2){
return true;
should return false because the two String Object references s1 and s2 are stored at different memory locations*
--My question, the fact that the comparision of ((Object)s1 == (Object)s2){... returning false is:
1) because they refer to different objects which are stored ar different locations?
OR
2) due to the above said: two String Object references s1 and s2 are stored at different memory locations
--I prefer the 1). But not so sure.
--If answer is 2), it will contradicts in following for s1 and s2 are stored at the different locations but the comparision ((Object)s1 == (Object)s2 will return true, i.e.,
String s1 = "ABC";
String s2 = "ABC";
uses String.intern at compile time
so
s1 reference at aaa looks for the String object at xxx
s2 reference at bbb looks for the String object at xxx
this way
if((Object)s1 == (Object)s2){
return true;
} should return true....
Further,
String s1 = "abc";
String s3 = s1;
Now, both s1 and s3 refer to the same Object ("abc"), but s1 and s3 are stored at different locations. Yet,
if (s1 == s3)... will return true.
This further indicates that the comparision of two references only has something to do with the actual location of the object, not the location of the reference itself.
Like to get your opinion on this issue.
Thanks
Scott -
Problem in comparing Two String
Hi friends
I have a strange Problem, i am able to find out the Reason for this problem.
In my Program i use a JTextField with implements the FocusListener. i just get the Text of this JTextField and retrive a record from DataBase which is Equal to the JTextField's Text. yes it retrives the same record. Now i want to compare these two Text. I mean the JTextFied text and the text which i retrived from the Database.
My code is this
public void focusLost (FocusEvent fe) {
Object obj = fe.getSource ();
if (obj == txtMemberId)
memberId = txtMemberId.getText().toString();
int memberDays,memberBooks,memberCat,heldBooks;
String mname,memberNo; //Use for Comparing the Member's Id.
boolean find = false; //To Confirm the Member's Id Existance.
try
//SELECT Query to Retrieved the Record.
String q = "SELECT * FROM Members WHERE RollNumber= '"+memberId+"'";
ResultSet rs = st.executeQuery (q); //Executing the Query.
rs.next (); //Moving towards the Record.
memberNo = rs.getString ("RollNumber");
//Storing the Record.
boolean ans=memberNo.equals(memberId);
System.out.println("STAUS OF THE COMPARISION:"+ans);
if (ans)
{ //If Record Found then Display Records.
System.out.println("RECORD FOUND DON'T WORRY");
find = true;
memberCat=rs.getInt("MCat");
heldBooks=rs.getInt("Bcnt");
System.out.println("HELD BOOK COUNT IS::"+heldBooks);
mname=rs.getString ("FirstName");
txtMemberName.setText (""+mname);
gblname=mname;
rs.close();
ResultSet rs1= st.executeQuery("Select * from Mecat where MCat = " + memberCat + "" );
rs1.next();
memberBooks=rs1.getInt("Blmt");
System.out.println("BOOK LIMITED TO::"+memberBooks);
memberDays=rs1.getInt("Dlmt");
if(heldBooks==memberBooks)
txtClear();
JOptionPane.showMessageDialog (this, "Book Limit Reached");
dispose();
GregorianCalendar gcal=new GregorianCalendar();
id1= gcal.get(Calendar.DATE);
im=(int)gcal.get(Calendar.MONTH)+1;
iy=gcal.get(Calendar.YEAR);
vd=id1+memberDays;
vm=im;
vy=iy;
String xx,yy,zz;
if(id1<10) {
xx="0"+id1;
} else {
xx = ""+id1;
if(im<10) {
yy="0"+im;
} else {
yy = ""+im;
idate=xx+"/"+yy+"/"+iy;
// String vdate=vd+"/"+vm+"/"+vy;
//******************** to calcutlate return date
//System.out.println("came here1!!!");
while(vd>31) {
if(im==1||im==3||im==5||im==7||im==8||im==10||im==12){
if(vd>31){
im=im+1;
vd=vd-31;
if(im>12){
im=im-12;
iy=iy+1;
if(im==4||im==6||im==9||im==11){
if(vd>30){
im=im+1;
vd=vd-30;
if(im>12){
im=im-12;
iy=iy+1;}
if(im==2){
if(vd>28){
im=im+1;
vd=vd-28;
if(im>12){
im=im-12;
iy=iy+1;
vdate = vd+"/"+im+"/"+iy;
//System.out.println("came here3!!!");
// txtMemberId.setText ("" + memberId);
txtDate1.setText(idate);
txtDate2.setText(vdate);
else {
find = false;
if (find == false) {
JOptionPane.showMessageDialog (this, "Really Record not Found.");
System.out.println("DON'T WORRY FIND A WAY");
catch (SQLException sqlex) {
if (find == false) {
//txtClear (); //Clearing the TextFields.
JOptionPane.showMessageDialog (this, "Really Record not Found.");
txtDate1.setText("");
txtDate2.setText("");
txtMemberId.setText("");
txtMemberId.requestFocus ();
catch(Exception e)
e.printStackTrace();
when i compare those two Text By using this Line
boolean ans=memberNo.equals(memberId);[b]It retruns False
please tell me what would be the Problem here
Thank you for your service
Cheers
JofinHi
Thank you very much, it is working for me. i am very greatful to you .
Thank you for your service
jofin -
Why i can't compare two string
* @(#)Assignment.java 1.0 03/12/12
* You can modify the template of this file in the
* directory ..\JCreator\Templates\Template_1\Project_Name.java
* You can also create your own project template by making a new
* folder in the directory ..\JCreator\Template\. Use the other
* templates as examples.
//package myprojects.assignment;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import java.text.*;
* MainForm.java
* Created on 12 December 2003, 16:27
* @author Akasha
public class Assignment extends javax.swing.JFrame {
private String myname;
private String utxtname,ptxtpass;
/** Creates new form MainForm */
public Assignment() {
initComponents();
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
private void initComponents() {
// JText = new JFormattedTextField();
jButton1 = new javax.swing.JButton();
jTextField1 = new javax.swing.JTextField();
jTextField2 = new javax.swing.JTextField();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
getContentPane().setLayout(null);
getContentPane().setBounds(800,800,800,800);
addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
formMouseClicked(evt);
addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(java.awt.event.WindowEvent evt) {
exitForm(evt);
jButton1.setBackground(new java.awt.Color(0, 0, 255));
jButton1.setForeground(new java.awt.Color(204, 255, 255));
jButton1.setText("Login");
jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jButton1MouseClicked(evt);
getContentPane().add(jButton1);
jButton1.setBounds(110, 160, 70, 30);
getContentPane().add(jTextField1);
jTextField1.setBounds(220, 70, 150, 20);
getContentPane().add(jTextField2);
jTextField2.setBounds(220, 100, 150, 20);
// getContentPane().add(JFormattedTextField1);
//JFormattedTextField.
jLabel1.setText("User Name");
getContentPane().add(jLabel1);
jLabel1.setBounds(60, 70, 150, 16);
jLabel2.setText("Password");
getContentPane().add(jLabel2);
jLabel2.setBounds(60, 100, 160, 16);
pack();
private void formMouseClicked(java.awt.event.MouseEvent evt) {
// Add your handling code here:
private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {
myname="mazhar";
utxtname = jTextField1.getText();
if (myname == utxtname)
JOptionPane.showMessageDialog(null,"This is"+ utxtname + myname+ " first ","Welcome",JOptionPane.INFORMATION_MESSAGE);
else if (myname != utxtname)
JOptionPane.showMessageDialog(null,"This is"+ myname+ "first action","Welcome",JOptionPane.INFORMATION_MESSAGE);
// Add your handling code here
/** Exit the Application */
private void exitForm(java.awt.event.WindowEvent evt) {
System.exit(0);
* @param args the command line arguments
public static void main(String args[]) {
Assignment assign =new Assignment();
//width and hight
assign.setSize(400, 175);
assign.show();
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JTextField jTextField1;
private javax.swing.JTextField jTextField2;
// End of variables declarationBasic java. I think that you need to read the tutorial... ;-) http://java.sun.com/docs/books/tutorial/
BAD (yours): you are comparing objects (ref to objects -> always differents even if there contains the same thing)
==========
if (myname == utxtname) {
JOptionPane.showMessageDialog(null,"This is"+ utxtname + myname+ " first ","Welcome",JOptionPane.INFORMATION_MESSAGE);
} else if (myname != utxtname) {
JOptionPane.showMessageDialog(null,"This is"+ myname+ "first action","Welcome",JOptionPane.INFORMATION_MESSAGE);
GOOD (mine):
===========
if (myname.equals(utxtname)) {
JOptionPane.showMessageDialog(null,"This is"+ utxtname + myname+ " first ","Welcome",JOptionPane.INFORMATION_MESSAGE);
} else {
//if (!myname.equals(utxtname)) {
JOptionPane.showMessageDialog(null,"This is"+ myname+ "first action","Welcome",JOptionPane.INFORMATION_MESSAGE); -
* @(#)Assignment.java 1.0 03/12/12
* You can modify the template of this file in the
* directory ..\JCreator\Templates\Template_1\Project_Name.java
* You can also create your own project template by making a new
* folder in the directory ..\JCreator\Template\. Use the other
* templates as examples.
//package myprojects.assignment;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import java.text.*;
* MainForm.java
* Created on 12 December 2003, 16:27
* @author Akasha
public class Assignment extends javax.swing.JFrame {
private String myname;
private String utxtname,ptxtpass;
/** Creates new form MainForm */
public Assignment() {
initComponents();
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
private void initComponents() {
// JText = new JFormattedTextField();
jButton1 = new javax.swing.JButton();
jTextField1 = new javax.swing.JTextField();
jTextField2 = new javax.swing.JTextField();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
getContentPane().setLayout(null);
getContentPane().setBounds(800,800,800,800);
addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
formMouseClicked(evt);
addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(java.awt.event.WindowEvent evt) {
exitForm(evt);
jButton1.setBackground(new java.awt.Color(0, 0, 255));
jButton1.setForeground(new java.awt.Color(204, 255, 255));
jButton1.setText("Login");
jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jButton1MouseClicked(evt);
getContentPane().add(jButton1);
jButton1.setBounds(110, 160, 70, 30);
getContentPane().add(jTextField1);
jTextField1.setBounds(220, 70, 150, 20);
getContentPane().add(jTextField2);
jTextField2.setBounds(220, 100, 150, 20);
// getContentPane().add(JFormattedTextField1);
//JFormattedTextField.
jLabel1.setText("User Name");
getContentPane().add(jLabel1);
jLabel1.setBounds(60, 70, 150, 16);
jLabel2.setText("Password");
getContentPane().add(jLabel2);
jLabel2.setBounds(60, 100, 160, 16);
pack();
private void formMouseClicked(java.awt.event.MouseEvent evt) {
// Add your handling code here:
private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {
myname="mazhar";
utxtname = jTextField1.getText();
if (myname == utxtname)
JOptionPane.showMessageDialog(null,"This is"+ utxtname + myname+ " first ","Welcome",JOptionPane.INFORMATION_MESSAGE);
else if (myname != utxtname)
JOptionPane.showMessageDialog(null,"This is"+ myname+ "first action","Welcome",JOptionPane.INFORMATION_MESSAGE);
// Add your handling code here
/** Exit the Application */
private void exitForm(java.awt.event.WindowEvent evt) {
System.exit(0);
* @param args the command line arguments
public static void main(String args[]) {
Assignment assign =new Assignment();
//width and hight
assign.setSize(400, 175);
assign.show();
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JTextField jTextField1;
private javax.swing.JTextField jTextField2;
// End of variables declarationBasic java. I think that you need to read the tutorial... ;-) http://java.sun.com/docs/books/tutorial/
BAD (yours): you are comparing objects (ref to objects -> always differents even if there contains the same thing)
==========
if (myname == utxtname) {
JOptionPane.showMessageDialog(null,"This is"+ utxtname + myname+ " first ","Welcome",JOptionPane.INFORMATION_MESSAGE);
} else if (myname != utxtname) {
JOptionPane.showMessageDialog(null,"This is"+ myname+ "first action","Welcome",JOptionPane.INFORMATION_MESSAGE);
GOOD (mine):
===========
if (myname.equals(utxtname)) {
JOptionPane.showMessageDialog(null,"This is"+ utxtname + myname+ " first ","Welcome",JOptionPane.INFORMATION_MESSAGE);
} else {
//if (!myname.equals(utxtname)) {
JOptionPane.showMessageDialog(null,"This is"+ myname+ "first action","Welcome",JOptionPane.INFORMATION_MESSAGE); -
Hi,
I have something like this, where book.cost( ) is a string that already existes an pages is another string with the number the user inserts. And no, unfortunatly I cannot do it with integers... How can I copare the value of both? thanks
if (book.cost( ) > pages){
book.print();
}else{
System.out.println("Any book with more than "+pages+" was found");
}Looks like you're doing the same coursework as me Kikens! I agree that they should both definately be int's, but apparently he wants us to use strings instead. No idea why though. The parseint method works fine for it, as long as you've entered a number that can be turned into a integer earlier - I've used a try-catch loop to return an error if it's not an integer.
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