Help with a Vector Array - pppppplllllllleeeeaaasse!!!!!!!
Hi I'm having a mare with a Vector Array that I want to contain String variables. I know you get a warning with the traditional implementation of a vector, and I have over come that using:
private Vector <String> MyVector = new Vector<String>();
But I also need to create a Vector Array and I am getting some very strange results - for a start in JPadPro it only comiles every second attempt, with every other failing due to the implementation of the Vector array.
Below is a snippet of the code that I have sort of got to compile but with a compiler warning:
private Vector<String>[] MyVector; //this is line 75
int Array;
public myClass()
Array = 5;
MyVector = new Vector[ Array ];
for( int i = 0; i < Array; i++ )
MyVector[ i ] = new Vector<String>();
The first time I complie I get:
CreateMessage.java Line 75: Syntax Error
The Second time I compile I get:
CreateMessage.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
Finished
I hate complier errors - I have gotten quite a few but have managed to remove them all but this one by searching the forum. Any help on the correct implementation of my Vector Array would be great,
Thanks in advance,
Kris
Mr_Bump180 wrote:
Well you lot are a real cheery bunchDo you come here for warm and fuzzies or for Java help?
- please accept my most humble apologies for daring to try and keep my thread light hearted. Use your brain. Nobody objects to keeping your thread lighthearted. It's that garbage like that is annoying and makes your post harder to read. If you want to get your question answered clear communication is of the essence. That should be common sense.
I asked the question simply as I wanted to improve my code - which I write for no gain, but just in an attempt to automate processes that I cannot find software to do for me. How is that relevant?
I find the solutions on this website invaluable, but what shines through most clearly - is the incredibly poor attitude of some of you - who are obviously java professionals - when a novice risks posting a question on what is obviously YOUR forum. Is that how you get your kicks? By jumping all over people that dare to ask a question in order to try and better themselves?Right. People jumped on your for asking a question. Get real.
I will as I always do, read the pages you have linked to, and I will also try and implement your solution into my code - I just find it a shame that in order to obtain any help people who are posting in the "New to Java Programming" by-the-way, run the gauntlet of your abuse if the question, grammar, syntax or perhaps even title don't measure up to your high standards.Dude, if you're asking somebody to volunteer his time to help you, isn't it obvious that it's in your best interest to make it as easy as possible for him to do so?
I will now turn the watch off this thread, and will not reply againAs if anybody cares.
- but for those of you reading - I wonder just how many can't bare me to have the last word and have to post a replySo, anytime somebody replies to something it must be because they have to have the last word?
with the clever little quote inserts, a greater than thou attitude, and some more brilliant humour (I was in stiches reading your rebuttals ) because I don't fully understand a concept and as such asked for help.Get over the "they teased me because I don't know Java" bullshit. It's simply not the case, and you bloody well know it.
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I've posted my code in full so hopefully everyone can see exactly what I have been doing.
Note - my code uses the observer/observable model. The method I am having the problem with the if statement is in the class HSBC.
Basically when the pin count reaches 4 (in the atm class) it sends the userid & pincode) over to the checkPinAndUserId(String pinCode, String userCode) method. Here the if statement should check the userid to see if the string parameter matches a string in the array. If it does it should check in the same position in the pin array to check the pin no is correct and then return true.
* @(#)BankAssignment.java 1.0 03/04/06
* This apllication l
package myprojects.bankassignment;
import java.awt.*; // import the component library
import java.awt.event.*; // import the evnet library
import javax.swing.*;
import java.util.*;
class Correct1v16 extends Frame // make a new application
public Correct1v16() // this is the constructor method
HSBC HSBCobj = new HSBC();
public static void main(String args[]) // this invokes the constructor of the class and creates a runable object 'mainframe'
Correct1v16 mainFrame = new Correct1v16(); // the constructor call of the class which creates an object of that class
class HSBC implements Observer, ActionListener
Frame f5;
JLabel refill, launch;
TextField tRefill, tLaunch;
JButton refillbut, launchbut;
int count;
String [] userId=new String [10];
String [] pin=new String [10];
public boolean authenticate = false;
int i;
public HSBC()
drawFrame();
Atm Atmobj = new Atm(this);
System.out.println("Starting HSBC constructor");
public void drawFrame()
System.out.println("Start HSBC drawframe method...");
f5=new Frame("HSBC");
f5.setLayout(new FlowLayout());
f5.setSize(200, 200);
f5.addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent e)
f5.dispose();
System.exit(0);
refill=new JLabel("Refill ATM");
launch=new JLabel("Launch new ATM");
tRefill=new TextField(20);
tLaunch=new TextField(10);
refillbut=new JButton("Refill ATM");
refillbut.addActionListener(this);
launchbut=new JButton("Launch new ATM");
launchbut.addActionListener(this);
f5.add(refill);
f5.add(tRefill);
f5.add(refillbut);
f5.add(launch);
f5.add(tLaunch);
f5.add(launchbut);
f5.setVisible(true);
//*********** POPULATE THE ARRAYS */
pin[0]="1234";
pin[1]="2345";
pin[2]="3456";
pin[3]="4567";
pin[4]="5678";
pin[5]="6789";
pin[6]="7890";
pin[7]="8901";
pin[8]="9012";
pin[9]="0123";
userId[0]="0";
userId[1]="1";
userId[2]="2";
userId[3]="3";
userId[4]="4";
userId[5]="5";
userId[6]="6";
userId[7]="7";
userId[8]="8";
userId[9]="9";
}// end drawframe method
// public Atm atmLink = (Atm)o;
public void update(Observable gm1, Object o)
Atm atmLink = (Atm)o;
tRefill.setText("Refill ATM ?");
atmLink.refill();
}//end update method
public void actionPerformed(ActionEvent ae)
if(ae.getSource() == refillbut)
// Atm Atmobj.refill();
// tRefill.setText("text area");
// atmLink.refill();
// Atmobj.refill();
// setChanged();
// notifyObservers();
if(ae.getSource() == launchbut)
tLaunch.setText("new ATM opened");
Atm Atmobj1 = new Atm(this);
//******** THIS METHOD RECEIVES THE PARAMETERS FROM THE ATM METHOD (LINE 580) (PINCODE AND USERCODE) BUT
//******** IT ONLY THE ARRAY CALLED USERID (WHICH HOLDS THE USER CODE MATCHES ONE OF THE USERID'S)
//******** I DO WANT IT TO DO THIS BUT I ALSO WANT IT TO MOVE ON AND CHECK THE PINCODE WITH THE PIN ARRAY)
//******** IF THEY ARE BOTH TRUE I WANT IT TO RETURN TRUE - ELSE FALSE. */
public boolean checkPinAndUserId(String userCode, String pinCode)
boolean found = false;
System.out.println("in checkpin method");
System.out.println("userCode = "+ userCode);
System.out.println("pinCode = " + pinCode);
for (int i = 0; i < userId.length; i++)
System.out.println("in the userid array" + userId);
if (userCode.equals(userId[i]))
System.out.println("checking user code array");
if (pinCode.equals(pin[i]))
System.out.println("checking the pin array" + pinCode);
System.out.println("pin[i] = "+pin[i]);
found = true;
return found;
}// end HSBC class
class Atm extends Observable implements ActionListener
Frame f1;
TextField t3, t5;
JTextArea display = new JTextArea("Welcome to HSBC Bank. \n Please enter your User Identification number \n", 5, 40);
JPanel p1, p2, p3,p4;
private JButton but1, but2, but3, but4,but5,but6,but7,but8,but9,but0,enter,
cancel,fivepounds,tenpounds,twentypounds,fiftypounds,clearbut, refillbut;
int state = 1;
public String pinCode ="";
public String userCode ="";
int userCodeCount = 0;
int PINCount = 0;
String withdrawAmount = "";
int atmBalance =200;
private HSBC HSBCobj;
//ATM constructor that receives the HSBCobj g1 reference to where the HSBC class
// in in the program
// Calls the drawATMFrame method
// add the observer to the HSBCobj reference so that the ATM can tell HSBC that
// something has changed
public Atm(HSBC g1)
HSBCobj = g1;
drawATMFrame();
System.out.println("Starting Atm constructor");
addObserver(HSBCobj);
// this is the method that draws the ATM interface
// also apply the Border Layout to the frame
public void drawATMFrame()
f1=new Frame("ATM");
f1.setLayout(new BorderLayout());
f1.setSize(350, 250);
f1.addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent e)
f1.dispose();
System.exit(0);
// declare & instantiate all the buttons that will be used on the ATM
but1 =new JButton("1");
but1.addActionListener(this);
but2 =new JButton("2");
but2.addActionListener(this);
but3 =new JButton("3");
but3.addActionListener(this);
but4 =new JButton("4");
but4.addActionListener(this);
but5 =new JButton("5");
but5.addActionListener(this);
but6 =new JButton("6");
but6.addActionListener(this);
but7 =new JButton("7");
but7.addActionListener(this);
but8 =new JButton("8");
but8.addActionListener(this);
but9 =new JButton("9");
but9.addActionListener(this);
but0 =new JButton("0");
but0.addActionListener(this);
enter=new JButton("Enter");
enter.addActionListener(this);
cancel=new JButton("Cancel/ \n Restart");
cancel.addActionListener(this);
fivepounds =new JButton("?5");
fivepounds.addActionListener(this);
tenpounds = new JButton("?10");
tenpounds.addActionListener(this);
twentypounds = new JButton("?20");
twentypounds.addActionListener(this);
fiftypounds = new JButton("?50");
fiftypounds.addActionListener(this);
clearbut = new JButton("Clear");
clearbut.addActionListener(this);
refillbut = new JButton("Refill");
refillbut.addActionListener(this);
//declare & instantiate a textfield
t3=new TextField(5);
// instantiate 4 JPanels
p1=new JPanel();
p2=new JPanel();
p3=new JPanel();
p4=new JPanel();
// add some buttons to p1
p1.add(but1);
p1.add(but2);
p1.add(but3);
p1.add(but4);
p1.add(but5);
p1.add(but6);
p1.add(but7);
p1.add(but8);
p1.add(but9);
p1.add(but0);
//add the text area field to p2
p2.add(display);
// apply the grid layout to p3
GridLayout layout3 = new GridLayout(4,1,5,5);
p3.setLayout(layout3);
p3.add(fivepounds);
p3.add(tenpounds);
p3.add(twentypounds);
p3.add(fiftypounds);
// apply grid layout to p4
GridLayout layout4 = new GridLayout(4,1,5, 5);
p4.setLayout(layout4);
p4.add(clearbut);
p4.add(enter);
p4.add(cancel);
p4.add(refillbut);
//add the panels to the different parts of the screen
f1.add("North", display);
f1.add("Center", p1);
f1.add("East", p4);
f1.add("West", p3);
f1.setVisible(true);
}// end drawATMframe method
public void actionPerformed(ActionEvent ae)
if(state == 1)
getUserIdNo(ae);
else if(state == 2)
doPINInput(ae);
else
withdrawCash(ae);
}// end action performed method
//******** STATE 1 events*/
//******** USER ID INPUT*/
public void getUserIdNo (ActionEvent ae)
if (ae.getSource() == but1)
display.append("*");
userCode = userCode + "1";
userCodeCount++;
if (ae.getSource() == but2)
display.append("*");
userCode = userCode + "2";
userCodeCount++;
if (ae.getSource() == but3)
display.append("*");
userCode = userCode + "3";
userCodeCount++;
System.out.println("user id ="+userCode);
if (ae.getSource() == but4)
display.append("*");
userCode = userCode = "4";
userCodeCount++;
System.out.println("user id ="+userCode);
if (ae.getSource() == but5)
display.append("*");
userCode = userCode + "5";
userCodeCount++;
System.out.println("user id ="+userCode);
if (ae.getSource() == but6)
display.append("*");
userCode = userCode + "6";
userCodeCount++;
System.out.println("user id ="+userCode);
if (ae.getSource() == but7)
display.append("*");
userCode = userCode + "7";
userCodeCount++;
System.out.println("user id ="+userCode);
if (ae.getSource() == but8)
display.append("*");
userCode = userCode + "8";
userCodeCount++;
System.out.println("user id ="+userCode);
if (ae.getSource() == but9)
display.append("*");
userCode = userCode + "9";
userCodeCount++;
System.out.println("user id ="+userCode);
if (ae.getSource() == but0)
display.append("*");
userCode = userCode + "0";
userCodeCount++;
System.out.println("user id ="+userCode);
if (ae.getSource() == cancel)
display.setText("Welcome to HSBC Bank.\n Please enter your User Identification number \n");
userCode = "";
state = 2;
if (ae.getSource() == clearbut)
display.setText("Please enter your user ID number again\n");
userCode = "";
userCodeCount = 0;
if (ae.getSource() == refillbut)
refill();
if (ae.getSource() == enter)
display.setText("Please enter your PIN \n");
state = 2;
System.out.println(" User id enter button = " + userCode);
if (userCodeCount == 1)
display.setText("Please enter your PIN \n");
//userCode = "";
userCodeCount = 0;
state = 2;
//******** STATE 2 */
//******** PIN INPUT*/
public void doPINInput(ActionEvent ae)
if (ae.getSource() == but1)
{ pinCode = pinCode.concat("1");
display.append("*");
PINCount++;
if (ae.getSource() == but2)
{ pinCode = pinCode.concat("2");
display.append("*");
PINCount++;
if (ae.getSource() == but3)
{ pinCode = pinCode.concat("3");
display.append("*");
PINCount++;
if (ae.getSource() == but4)
{ pinCode = pinCode.concat("4");
display.append("*");
PINCount++;
if (ae.getSource() == but5)
{ pinCode = pinCode.concat("5");
display.append("*");
PINCount++;
if (ae.getSource() == but6)
{ pinCode = pinCode.concat("6");
display.append("*");
PINCount++;
if (ae.getSource() == but7)
{ pinCode = pinCode.concat("7");
display.append("*");
PINCount++;
if (ae.getSource() == but8)
{ pinCode = pinCode.concat("8");
display.append("*");
PINCount++;
if (ae.getSource() == but9)
{ pinCode = pinCode.concat("9");
display.append("*");
PINCount++;
if (ae.getSource() == but0)
{ pinCode = pinCode.concat("0");
display.append("*");
PINCount++;
if (ae.getSource() == clearbut)
display.setText("Please enter your PIN number again \n");
pinCode = "";
PINCount = 0;
if (ae.getSource() == cancel)
display.setText("Welcome to HSBC Bank.\n Please enter your User Identification number \n");
state = 1;
pinCode ="";
PINCount = 0;
if (ae.getSource() == refillbut)
refill();
/// ************************ THIS BUTTON SENDS THE PIN & USER CODE OVER TO THE MAIN BANK*/
/// ************************ (LINE 152) */
if (ae.getSource() == enter)
// if(HSBCobj.checkPinAndUserId(pinCode, userCode))
// display.setText("How much would you like to withdraw \n");
// else
// display.setText("Your UserId and Pin code do not match");
if(PINCount ==4)
if(HSBCobj.checkPinAndUserId(userCode,pinCode))
display.setText("Enter the amount you \n want to withdraw \n ?");
PINCount=0;
else
display.setText("Your User Identification Number \n and PIN number do not match! \n please try again\n");
//*********** STATE 3 events*/
//*********** withdrawCash*/
public void withdrawCash(ActionEvent ae)
// if (ae.getSource() == but1)
// display.append("1");
/// withdrawAmount = withdrawAmount+1;
// pinCode = pinCode.concat("2");
// System.out.println("Withdrawal Amount = "+withdrawAmount);
if(ae.getSource( ) == but1)
withdrawAmount = withdrawAmount + "1";
display.setText(withdrawAmount);
if(ae.getSource( ) == but2)
withdrawAmount = withdrawAmount + "2";
display.setText(withdrawAmount);
if(ae.getSource( ) == but3)
withdrawAmount = withdrawAmount + "3";
display.setText(withdrawAmount);
if(ae.getSource( ) == but4)
withdrawAmount = withdrawAmount + "4";
display.setText(withdrawAmount);
if(ae.getSource( ) == but5)
withdrawAmount = withdrawAmount + "5";
display.setText(withdrawAmount);
if(ae.getSource( ) == but6)
withdrawAmount = withdrawAmount + "6";
display.setText(withdrawAmount);
if(ae.getSource( ) == but7)
withdrawAmount = withdrawAmount + "7";
display.setText(withdrawAmount);
if(ae.getSource( ) == but8)
withdrawAmount = withdrawAmount + "8";
display.setText(withdrawAmount);
if(ae.getSource( ) == but9)
withdrawAmount = withdrawAmount + "9";
display.setText(withdrawAmount);
if(ae.getSource( ) == but0)
withdrawAmount = withdrawAmount + "0";
display.setText(withdrawAmount);
if (ae.getSource() == fivepounds)
withdrawAmount = withdrawAmount + "5";
display.setText(withdrawAmount);
atmBalance();
if (ae.getSource() == tenpounds)
withdrawAmount = withdrawAmount + "10";
display.setText(withdrawAmount);
atmBalance();
if (ae.getSource() == twentypounds)
withdrawAmount = withdrawAmount + "20";
display.setText(withdrawAmount);
atmBalance();
if (ae.getSource() == fiftypounds)
withdrawAmount = withdrawAmount + "50";
display.setText(withdrawAmount);
atmBalance();
// if (ae.getSource() == tenpounds)
// display.append("10");
// withdrawAmount = 10;
// pinCode = pinCode.concat("2");
// System.out.println("10 pound button pressed");
// atmBalance();
if (ae.getSource() == enter)
atmBalance();
if (ae.getSource() == refillbut)
System.out.println("refill but pressed");
refill();
if (ae.getSource() == clearbut)
System.out.println("clear but pressed");
display.setText("Enter the amount you want to withdraw \n ?");
withdrawAmount="";
if (ae.getSource() == cancel)
display.setText("Welcome to HSBC Bank.\n Please enter your User Identification number \n");
withdrawAmount="";
pinCode ="";
PINCount = 0;
userCode = "";
userCodeCount = 0;
state = 1;
}// end withdraw cash input method
// checks balace of atm and withdraws cash. Also notifies onserver if atm balance is low
public void atmBalance()
String s = withdrawAmount;
int n = Integer.parseInt(s);
if ( atmBalance >= n)
atmBalance = atmBalance - n;
System.out.println("atm balance = "+ atmBalance);
display.setText("Thankyou for using HSBC. \nYou have withdrawn ?"+n);
if (atmBalance<40)
System.out.println("atm balance is less than 40 - notify HSBC" );
setChanged();
notifyObservers(this);
/// note the refil should send a message to the controller
// advising a refil is needed. The Bank will send an engineer
// out who will fill the atm up
}// end atmBalance method
/// note the refil should send a message to the controller
/// then th coontroller will send a message to this method to fill machine
/// (this is simulating a clerk filling atm)
public void refill()
System.out.println("in refill method" );
atmBalance = 200;
System.out.println("Atm has been refilled. Atm balance = " + atmBalance);
// setChanged();
// notifyObservers(this);
}// end refill method
// NOTE SURE ABOUT THIS - DO I USE THE UPDATE METHOD TO NOTIFY HSBC THAT ATM REQUIRES FILLING
// THIS IS THE WRONG PART OF THE PROGRAM (SHOULD BE IN HSBC) - IGNORE
public void update(Observable gm1, Object gameObj)
display.setText("Congratulations");
}//end update method
}// end Atm method
}// end Assignment2 clas
[\code]I wasn't trying to annoy anyone at all.
I'm new to java and have been told that using the observer/observable model is not considered basic java. So that is the only reason I posted it in this section. At the same time i feel that the bit I'm struggling with is actually basic - hence posting it in the basic section. I'm not sure if people of all abilities check all forums or just the ones they feel at at their standard.
So appologies if you've taken offence. -
Plz help with my vector... :/ :)
hi...
i've seen a lot of answers about reducing or increasing the size of the
vector because the for-loop may ask for objects in the index of the vector that may not exist, but i believe that this is not the case in the specific problem because the x<=planes.size() gives exaclty the scope that the for-loop will look for.
i havent referenced all the code but the parts that i believe that they are crucial....
also i've tried to initialize the vector with a lot of values but it didnt helped me....
any comments would be thankfull... :)
protected Vector planes;
protected Plane currentPlane;
planes = new Vector();
public void getArrivals() {
for (x=0; x<=planes.size(); x++)
currentPlane = (Plane)planes.elementAt(x);
if ( currentPlane.getStatus() == "Entered the Airport Area" ){
System.out.println ("The flight " + currentPlane.getFlightNumber() +
" to " + currentPlane.getCity() + " has just " + currentPlane.getStatus());
}Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 5 >= 5
at java.util.Vector.elementAt(Vector.java:427)
at ListOfPlanes.getArrivals(ListOfPlanes.java:94)Ain't life great? You get a bunch of answers in less than 15 minutes. :)
Iterators eliminate the need to remember indices and array locations. Consequently you need to use a while loop instead of a for loop.
It's useful in some situations but not all. If you want to use it, you code would look like:
import java.util.Enumeration;
public void getArrivals() {
Enumeration enu = planes.elements();
while (enu.hasMoreElements())
currentPlane = (Plane)enu.nextElement();
if ( currentPlane.getStatus() == "Entered the Airport Area" ){
System.out.println(// blah blah blah...
}Enumeration is a variation of Iterator in that Enumeration is read-only while Iterator allows objects to be optionally removed one at a time. -
I need to process a tab delimited list and I'm able to put the data into an array. See the image of the array below:
Now that the list is separated into 5 array elements, each element is a list by itself.
How can I create a structure for the list within each array element so I will have an Array with 5 element and each element contain a structure with keys and values???
To create the above array I simply use :
<cffile action="READ" file="#FeedPath##FileName#" variable="MyFile">
<cfset MyArray = listtoarray(MyFile,"#chr(13)##chr(10)#")>
Please help!alecken wrote:
So I guess in you example, I don't quite undertand what should I do with the somePartOf(MyArray[i]
Well "somePartOf(myArray[i])" was vague, because I had no idea how you wanted to parse up your data into a structure. The previous post gives some idea how you want to parse it up, but there are still chalanges you will have to work out because it is your data. You could easily treat the value as a space delimited list, but you do not seem to have a one to one relationship between space separated values and your desired structure keys. You will have to work out the business rules that turns that data into the structure you desire. There is no magic "Make My Random Data into a Structure" function.
These would apply to the first two keys you described, but I have no idea how the rest of the data parses out.
<cfset myArray2[i]["id"] = listFirst(myArray[i]," ")>
<cfset myArray2[i]["addressType"] = listGetAt(2,myArray," ")> -
Need some help with multi dimensional arrays plz
Hello,
Lets say I have a three-dim array, call it pyList. This array goes from pyList[0][0][0] to pyList[5][5][5] (216 values). Now, I also have a two-dim array, call it V, which goes from V[0][0] to V[35][5]. What I would like to do is assign V[0][0] the value in pyList[0][0][0], V[0][1] to pyList[0][0][1], and so on up to V[0][5] = pyList[0][0][5]. Then I want V[1][0] = pyList[0][1][0]...
I want this to go on until V[35][5] = pyList[5][5][5]. Basically Im splitting up pyList into chunks of 6 consecutive values and making each row in V equal to those 6 values.
Is this possible to do? I cant seem to figure out the proper way to set up the for loops so that my indices are correct.
If anything is unclear please let me know.
Any help is greatly appreciated.
Thank you
-Big_GoonDo you need to create new arrays? That is, should the array V[0] be a different object than pyList[0][0]?
Since "multidimensional arrays" are simply arrays of arrays it is possible to write V[0] = pyList[0][0] and then every V[0][x] is the same as pyList[0][0][x]. But if you change either of them the change will show in both arrays.
Otherwise, you will need a loop:for (int y = 0; y < 36; y++)
System.arraycopy(pyList[y / 6][y % 6], 0, V[y], 0, 6);Or maybe it's more maintanable with two:for (int y = 0; y < 6; y++)
for (int x = 0; x < 6; x++)
System.arraycopy(pyList[y][x], 0, V[6*y + x], 0, 6); -
I need help with a Object Array
I am having trouble and this maybe really simple seeing that I am fairly new to java but I have text that is being broken down in to preset part with those parts stored in Object arrays.
Now I also have a object array inside my object array. Within the second object array are the broken down parts of the text and I want to compare this text with another string so for example this is what I am trying
boolean found = false;
for (int i = 0; i < FirstObjectArray.length ;i++)
Object[] SecondObjectArray = (Object[]) FirstObjectArray;
if(SecondObjectArray[0] == "string")
found = true;
break;
else
found = false;
}Help would be very appreciated.astlanda wrote:
Sure, you're right.
[public boolean equals(Object obj)|http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html#equals%28java.lang.Object%29]
sharkura said all the OP needs at the moment. I just wanted to clarify a bit why You don't use == 99.999% of the time with objects, and never with String.
I have argued elsewhere in these forums that it is inappropriate to tell anyone that you never use == to compare objects. This has not always been accepted. I have, on rare occasions, known experienced developers to blindly compare two objects with equals(), and cite the professor that taught them, 15 years iin the past, that object references are never compared using ==, but always with equals().
However, the cases where == is appropriate and equals() is not are indeed rare, but not, in my experience, non-existent. In my statement, I probably exaggerated. And String is a case where I can probably accept that you will probably never go wrong with equals(). If the String has been pooled (see String::intern()), you can actually use either. From the javadocs: "*It follows that for any two strings s and t, s.intern() == t.intern() is true if and only if s.equals(t) is true.*"
¦ {Þ -
Please help with ovals and arrays
i'm creating an array that will be used to create a number of bubbles (simple ovals) on the screen. I can create 1 bubble/oval with no problem, but when i use the array to create multiple ones, everything craches and i get a big number of errors.
Can someone please help or point me in the right direction?
thank you
Marko
p.s. the code that i'm using at the moment is listed below. * to draw 1 oval, array not used
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JPanel;
import javax.swing.JFrame;
public class Bubbles extends JPanel
int array[] = {1,2,3,4,5};
public void paintComponent(Graphics g)
super.paintComponent(g);
this.setBackground(Color.WHITE);
for(int x = 0; x<5; x++)
g.setColor(Color.BLUE);
g.drawOval((array.(30,30,100,100));
public static void main( String args[])
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Bubbles b = new Bubbles();
b.setBackground(Color.WHITE);
frame.getContentPane().add(b);
frame.setSize(400, 400);
frame.setVisible(true);Finally, this plug-in is ready for beta testing on www.amazoncanvas.com
Thank you all who have participated in this program. -
Hi,
pretty new to Oracle and am not a programmer by profession.
Am trying to write a stored procedue that will create statements to
insert across a gateway, and have some of the insert statements
contain trims, depending on the column type.
so I am looping through one record at a time from dba_tab_columns.
Basically the below.
FOR tab in (
SELECT table_name,column_name,data_type
FROM dba_tab_columns where owner='MY_OWNER'
LOOP
END LOOP;
END;
But, what I really need to do is to loop all of the columns found for
each table into an array, so that at the end of the loop for each
table, one line is printed out something like this:
insert into my_table ( col1,col2 ... col_last) select col1,col2 ..
col_last from table@gateway_link.
The problem is in how to use the arrays to get each loop iteration to
be stored, and all printed out in one line at the end of each loop
iteration.
I hope I'm explaining this clearly enough. It sounds pretty simple,
but I am not able to figure it out.
Thanks for any help.
fwellers.I don't understand how you know which table is going to select from which remote table, but that's your problem
as a code-snippet, I'll give you the following idea:
SQL> get t7
1 declare
2 type tab_typ is table of varchar2(30);
3 l_tables tab_typ;
4 l_columns tab_typ;
5 l_str varchar2(4000);
6 cursor l_tab_cur is select table_name from all_tables where owner = 'SCOTT' and table_name in ('EMP', 'DEPT');
7 -- if you want to fill the table names, you could use str2tbl(tab_param)
8 cursor l_col_cur (p_tab_name varchar2) is
9 select column_name from all_tab_columns where owner = 'SCOTT' and table_name = p_tab_name;
10 begin
11 -- either set tables by hand;
12 l_tables := tab_typ('EMP', 'DEPT');
13 -- or fill it by a cursor
14 open l_tab_cur;
15 fetch l_tab_cur bulk collect into l_tables;
16 close l_tab_cur;
17 -- process the column of the tables
18 for i in 1..l_tables.count loop
19 dbms_output.put_line('processing table ' || l_tables(i));
20 open l_col_cur(l_tables(i));
21 fetch l_col_cur bulk collect into l_columns;
22 close l_col_cur;
23 l_str := 'insert into my_table' || i || ' (';
24 for j in 1..l_columns.count loop
25 l_str := l_str || l_columns(j) || ', ';
26 end loop;
27 l_str := substr(l_str, 1, length(l_str) -2) || ')';
28 dbms_output.put_line(l_str);
29 l_str := 'select ';
30 for j in 1..l_columns.count loop
31 l_str := l_str || l_columns(j) || ', ';
32 end loop;
33 l_str := substr(l_str, 1, length(l_str) -2) || ' from ' || l_tables(i) || '@remote_db;';
34 dbms_output.put_line(l_str);
35 end loop;
36* end;
SQL> /
processing table EMP
insert into my_table1 (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO)
select EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO from EMP@remote_db;
processing table DEPT
insert into my_table2 (DEPTNO, DNAME, LOC)
select DEPTNO, DNAME, LOC from DEPT@remote_db;
PL/SQL procedure successfully completed.
SQL> -
Help with PL/SQL arrays or Types
Hi,
I have a SQL query that returns the ID and the DESCRIPTION. I would like to loop through Ref Cursor and store these values into multi-array or something. What is the best way to achieve this? I appreciate your help.
ID DESCRIPTION
1 test1
2 test2
3 test3
Thanks..You could use SELECT ... BULK COLLECT INTO arrayname, although for any serious volumes or concurrency it will take some redesign to avoid grabbing all the server's memory resources. Also I expect Billy will be along in a minute to tell you your approach is all wrong.
Why do you need an array? -
Need help with returning an array of object
hello, i've been trying to make a method that returns bot ha boolean and a colour for a render for a Jtable and the code for the method is:
public Object[] isHighlightCellsWithColour(int xInternal, int colInternal) {
Object[] returnWithTwoValue;
boolean isHighLight = false;
returnWithTwoValue = new Object[2];
returnWithTwoValue[0] = isHighLight;
returnWithTwoValue[1] = null;
if (colourPassed == true && this.foundDupeInternal > -1) {
for (int c6 = 0; c6 < foundDupeInternal; c6++) {
if (this.rows[c6] == xInternal && this.cols[c6] == colInternal) {
isHighLight = true;
Color colourToSet = errorColourList[c6];
returnWithTwoValue = new Object[2];
returnWithTwoValue[0] = isHighLight;
returnWithTwoValue[2] = colourToSet;
return returnWithTwoValue;
} else {
return returnWithTwoValue;
return null;
}and when i go and try to use it at
check = new Object[2];
check = isHighlightCellsWithColour(xCurrentlyDrawing, colCurrentlyDrawing);
boolean z = false;
try {
z = (Boolean) check[0];
} catch (NullPointerException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Color x = Color.white;
try {
x = (Color)check[1];
} catch (NullPointerException e) {
// TODO Auto-generated catch block
e.printStackTrace();
it gives me a nullpointerexception, which i try to catch, but it STILL gives me that error, i have no clue on how to cast from object back to boolean or colour after they are cast into objects
or else is there a way to pass two different types of data back from a method? Other than using static variables that is, since that gave me problems, it only draws the first cell in colum that is in error in the colour specified , not the rest...
thanks for your time
Edited by: TheHolyLancer on Mar 8, 2008 12:42 AMyay that got it working, but the method still only draws the first cell with the colour only, need another way to do this one...
now comes another puzzeling question, it is giving me an null pointer exception again in:
System.out.println("setting colour "+ x.getBlue() + " On cell " + xCurrentlyDrawing + colCurrentlyDrawing);when i add that to the part where i set the colour, and colour is set to x (which is a color that is passed down by the method) and this will only run if it is determined that a colour is already passed, but it still gives me null pointer error?
maybe i'll take this to the swing forum tommrow
Edited by: TheHolyLancer on Mar 8, 2008 2:17 AM
Edited by: TheHolyLancer on Mar 8, 2008 2:19 AM -
Hey guys. I'm a bit of a noob here, and I'm sure you can fix up my problem real quick. Ok, I'm trying to make an array where, after you enter some integers, will automatically rearrange those integers from smallest to largest for you and print them back out to the screen. Here's my code:
import cs1.Keyboard;
public class Array2
public static void main (String[] args)
int num;
int count=0, step=1;
System.out.println("Enter the length of the array");
int arraylength = Keyboard.readInt();
int[]Array = new int[arraylength];
System.out.println("Enter the first value in the array:");
Array[0] = Keyboard.readInt();
while(count<arraylength-1)
System.out.println("Enter the next value in the array:");
num = Keyboard.readInt();
if(num>Array[count])
Array[count+1]=num;
count++;
else
for (int count2=count; 0 <= count2; count2--)
Array[count2]=Array[count2+1];
num = Array[count2];
count++;
for(int outputcount=0; outputcount<arraylength; outputcount++)
System.out.print(Array[outputcount] + " ");
}An assignment is yours to learn from, not ours to write for you. Try doing some debugging of the program - use System.out.println() statements to print values of various program variables and to see what the program is doing. If you get to a point that you can't solve a specific problem, then post a specific question and example of the problem. (So far, all you've done is said "the program doesn't work")
-
Need help with random string arrays
Hi, I could really use some specific advice about how to randomize and display strings. I'm trying to create an applet that displays a list of 12 chores and a list of four people for whom the chores should be distributed to. So far I have set up the code to display the chores list in the first column and what I'm tring to do is then randomly assign each persons name 3 times in the second column. I'm not getting any error messages but the problem is that I can't seem to get the names to appear only 3 times.
// Random generator = new Random();
// JButton assignChores = new Button("Assign Chores")'
// JTextArea outputArea = new JTextArea("");
// ect....
public void actionPerformed(ActionEvent e) {
String[] chores = {"Living Room",
"Dining Room",
"Kitchen",
"Boy's Room",
"Garbage",
"Backyard",
"Pets",
"Front Bathroom",
"Back Bathroom",
"Laundry",
"Computer Room",
"Parent's Room"};
String[] person = {"Mom",
"Dad",
"Son",
"Daughter"};
int[] numIndex = new int[13];
String output = "Chores" + "\t" + "Person";
output += "\n________________________________\n";
// I feel relatively certain that a while statement should go
// here but I'm lost as to how I should go about this.
for (int i = 1; i < numIndex.length; i++) {
int arrayIndex = generator.nextInt(person.length); // generate a random number based on the number of people
output += "\n" + chores[numIndex[0]++] // display the chores list in column 1
+ "\t" + person[arrayIndex]; // then randomly display the names in column 2
output += "\n________________________________\n";
outputArea.setText(output);
JOptionPane.showMessageDialog (null, outputArea,
"Chores List", JOptionPane.INFORMATION_MESSAGE);
System.exit(0);Hi,
Here's even a more elegant twist on the problem.
import java.util.*;
class FamilyMember
private String name;
private ArrayList chores;
private final int MAX_CHORES = 3;
public FamilyMember( String name )
this( name, null );
public FamilyMember( String name, Collection chores )
this.name = name;
setChores( chores );
public String getName()
return( name );
public Collection getChores()
return( chores );
private void initArray()
if( chores == null )
chores = new ArrayList();
public void setChores( Collection newChores )
if( newChores != null )
initArray();
if( newChores.size() <= MAX_CHORES )
Iterator it = newChores.iterator();
while( it.hasNext() )
chores.add( it.next() );
public boolean addChore( String newChore )
boolean outBool = false;
initArray();
if( chores.size() < MAX_CHORES )
chores.add( newChore );
outBool = true;
return( outBool );
public void setName( String newName )
name = newName;
class Chore
private String name;
private boolean assigned;
public Chore( String name )
this.name = name;
public String getName()
return( name );
public void setName()
this.name = name;
public void setAssigned( boolean newAssigned )
assigned = newAssigned;
public boolean isAssigned()
return( assigned );
public class ChoreLister
public static void main(String[] args)
Chore[] chores = { new Chore( "Living Room" ),
new Chore( "Dining Room" ),
new Chore( "Kitchen" ),
new Chore( "Boy's Room" ),
new Chore( "Garbage" ),
new Chore( "Backyard" ),
new Chore( "Pets" ),
new Chore( "Front Bathroom" ),
new Chore( "Back Bathroom" ),
new Chore( "Laundry" ),
new Chore( "Computer Room" ),
new Chore( "Parent's Room" ) };
FamilyMember[] fm = { new FamilyMember( "Mom" ),
new FamilyMember( "Dad" ),
new FamilyMember( "Son" ),
new FamilyMember( "Daughter" ) };
Random generator = new Random();
System.out.println( "Chores\tPerson" );
System.out.println( "________________________________" );
// Loop through all chores assigning them as we go.
for( int j = 0; j < chores.length; ++j )
int arrayIndex = generator.nextInt( fm.length );
while( !chores[j].isAssigned() )
while( !fm[arrayIndex].addChore( chores[j].getName() ) )
arrayIndex = generator.nextInt( fm.length );
chores[j].setAssigned( true );
System.out.print( chores[j].getName() + "\t" );
if( chores[j].getName().length() < 8 )
System.out.print( "\t" );
System.out.println( fm[arrayIndex].getName() );
System.out.println( "________________________________" );
}Enjoy,
Manfred. -
Help with arrays...Please Help
Hello,
Iam trying to make a library system. I have three classes, one for the GUI, User class, and Users class. User class instantiates an object with all the relevant data like, Name, Age, Address, etc. The Users class contains a array of User Objects.
With this program I have to be able to create users, display users and delete users. The problem Iam having is displaying them. (I think I correctly store the User Objectsin the array, and Iam having problems retreiving them). The thing is when I run the program I don't get any exception errors, just nothing gets displayed!
Here is part of my code:
public class Users {
//declaring variables
public Users (){
initialiseArray();
public void initialiseArray(){
userArray = new User [50];
// This method first checks to see if there is enough room for a new
// user object. If there is the object is added to the array, if there is'nt
// Then method expandUserArray is called to make room for the user
public void addUser( User user)
if (userArraySize == userArray.length) {
expandUserArray();
userArray[userArraySize] = user;
userArraySize++;
// In this method first the user is searched for in the array, if found
// Then method decreaseUserArray is called to delete the user
public void deleteUser ( User user )
location = 0;
while (location < userArraySize && userArray[location] != user) {
location++;
if (userArray[location] == user) {
decreaseUserArray(location);
public void displayUsers( ){
for (int i = 0; i < userArraySize; i++) {
usersInformation += "\n" + (userArray.getUserName());
usersInformation += "\t" + (userArray[i].getUserID());
usersInformation += "\t" + (userArray[i].getUserAddress());
public String getUserInformation(){
//usersInformation = userInformation.toString();
return usersInformation;
// The User is deleted by shifting all the above users one place down
private void decreaseUserArray(int loc)
userArray[loc] = userArray[userArraySize - 1];
userArray[userArraySize - 1] = null;
userArraySize--;
// This method increase the size of the array by 50%
private void expandUserArray( )
int newSize = (int) (userArray.length * increasePercentage);
User newUserArray[] = new User[newSize];
for (int i = 0; i < userArray.length; i++) {
newUserArray[i] = userArray[i];
userArray = newUserArray;
Is there anything wrong with my arrays??? Here is part of my code for action performed:
void addUserButton_actionPerformed(ActionEvent e) {
newUserName = userNameTextField.getText();
newUserAddress = userAdressTextField.getText();
newUserID = Integer.parseInt ( userIDTextField.getText());
User newUser = new User (newUserName, newUserAddress, newUserID);
Users users = new Users();
users.addUser(newUser);
clearButton();
void displayUsersButton_actionPerformed(ActionEvent e) {
Users users = new Users();
users.displayUsers();
displayUsersTextArea.append (users.getUserInformation());
void deleteUserButton_actionPerformed(ActionEvent e) {
//Still incomplete
Thanks for your help!First, PLEASE USE THE SPECIAL TOKENS FOUND AT
http://forum.java.sun.com/faq.jsp#messageformat WHEN
POSTING CODE!!!! Sorry about that, Iam new and I did'nt know about Special Tokens.
As far as the problem, let me start out by asking if
you've considered using a class that implements the
List interface. Perhaps Vector or ArrayList would
make a better choice since they already handle
"growing" and "shrinking" for you.I tried using vector arrays but it got too complicated. It was very easy to add and remove objects from the vector but I never figured out how to display all the objects with all the data.
public void displayUsers( ){
for (int i = 0; i < userArraySize; i++) {
usersInformation += "\n" +
" + (userArray.getUserName()); //what is
usersInformation? Also, how does getUserName(),
getUserID(), getUserAddress() know which user object
to operate on if these are methods of userArray?
usersInformation += "\t" +
" + (userArray.getUserID()); //I'm guess you've
only posted "some" of your code.
usersInformation += "\t" +
" + (userArray.getUserAddress());//Try posting all
that you have so far, and please use the special
tokens to format your code.
}I made a mistake while I was cutting & pasting my code. It should be for example:
usersInformation += "\n" (userArray.getUserName());
The comment about instanciating a new Users for each
actionPerformed is on point. You are replacing your
Usres with a new object each time.Yep this was the problem. I just changed the constructor, declared and
created object of Users elsewhere.
Thanks for your help! -
Here is the go folks this is a pice of code which I was helped with by a member of this forum, THANX HEAPS DUDE. What has happened now is the criteria is changed, previously it would search for a string in the vector. But now I have to have searches with wildcards, so it needs to utilize a char array methinks. So it will go through change the parameter to a char array, then go through the getDirector() method to return a director string, then it needs to loop through the char array and check if the letters are the same. then exit on the wild card. Now all this needs to be happening while this contruct down the bottom is looping through all the different elements in the moviesVector :s if anyone could give me a hand it is verry welcome. I must say also that this forum is very well run. 5 stars
public void searchMovies(java.lang.String searchTerm) {
Iterator i = moviesVector.iterator();
while (i.hasNext()) {
Movie thisMovie = (Movie)i.next();
//Now do what you want with thisMovie. for instanse:
if (thisMovie.getDirector().equals(searchTerm))
foundMovies.add(thisMovie);
//assumes foundMovies is some collection that we will
//return later... or if you just want one movie, you can:
//return thisMovie; right here.
}Sorry, I clicked submit, but i didnt enable to wtch it, so i stoped it before it had sent fully. Evidently that didnt work.
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