Liam Tiarnach

That's because you can only access printers that are currently install on your pc whether it be local or network. In regards to network printers, you would need rights and drivers in order to print to them.

[ January 22, 2008: Message edited by: Liam Tiarnach ]
[ January 22, 2008: Message edited by: Liam Tiarnach ]

Perhaps this example might be helpful...
import java.swing.*; import java.awt.*; public class PanelReloader extends JFrame{ private JPanel reloadThis; private JLabel someLabel; private JButton someButton; public PanelReloader(String title){ super(title); assemblePanel(); setVisible(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } private void assemblePanel(){ reloadThis = new JPanel(); someLabel = new JLabel("Some Label"); someButton = new JButton("Click Here"); reloadThis.add(someLabel,BorderLayout.NORTH); reloadThis.add(someButton,BorderLayout.SOUTH); // add(reloadThis); <- can be used in J2SE 5&6 getContentPane().add(reloadThis); } public void updatePanel(){ getContentPane().removeAll(); assemblePanel(); // or some other method or command... repaint(); } }
[ December 06, 2007: Message edited by: Liam Tiarnach ]

I noted that you declared a BufferedReader for getting user input, but then you are using this
Guess = input.readInt();
on the line you are trying to get the input from...

If the BufferedReader In is the input source then you will need to change your code to use it.

i.e.
try{ Guess = Integer.parseInt(In.readLine()); }catch(NumberFormatException nfe){ Guess = 0; // or some action you want it to carry out in the the event of //of an exception. }

[ October 20, 2007: Message edited by: Liam Tiarnach ]
[ October 20, 2007: Message edited by: Liam Tiarnach ]

Each time you are creating a new top level window (JFrame)
JFrame frame = new JFrame("SplitPane");
every time you call the "show()" method from you class SplitPane, to have it all display in same window, you have to get a reference to that window then add your "splitpane" to that window.

an example
public void actionPerformed(ActionEvent someAction){ theMainJFrameReference.getContentPane().add(splitpane,BorderLayout.EAST); \\some more code... }

for more detail information, check this linkJava Swing Tutorial

The problem you are encounter is a variable scope issue.

You declared local variables in your actionPerformed() method but are trying to access them in your paint() method which is why you are getting compiling problems.

I don't see any "generics" in your code...
The error state that you are using a raw non parameterized ArrayList...
If you want a generified ArrayList, then you have to include the generic parameters ( terminology anyone ? )...
ArrayList <Attraction> list = new ArrayList <Attraction> ();
now the ArrayList is set to take only Attraction types...

here is a link to Sun's Java Tutorial Generics Lesson...
http://java.sun.com/docs/books/tutorial/extra/generics/index.html

check it out so that you can learn what and how to use generics...

have fun...

Originally posted by Adam Blais:
I have declared the following:
The System.out.println sends everything to the console window perfectly, but my output file remains blank and it doesn't seem to want to write to the file. Any help?

Try...
out.close();
check API for details...

Originally posted by kri shan:
I have inner class. How can i add System.out.println()..within inner class...This inner class does not contain main()

Check this link out...
http://java.sun.com/docs/books/tutorial/index.html
It has the answer to this and many more questions that you may have...

Here is an example using the equals() method...
import java.util.ArrayList; public class DataHold { private String data; public DataHold(String data){ this.data = data; } public String getData(){ return data; } public String toString(){ return data; } public boolean equals(Object o){ // overridden equals method... if ( o.toString().equals(this.data)){// takes a DataHold object and compares the String data... return true;// both String are equal }else{ return false; // both not equal } } public static void main( String [] x){ String [] testData = {"one","two","three","four","five","six"}; ArrayList testList = new ArrayList(); for (int i = 0;i < testData.length;i++){ testList.add(new DataHold(testData[i])); // adding the DataHold objects... } /* Here we get the index by passing a new DataHold object with the same String value as the one we ** are looking for */ System.out.println(" Index of DataHold three : " + testList.indexOf(new DataHold("three"))); DataHold dh1 = (DataHold)testList.get(4); // we get an element out of our ArrayList DataHold dh2 = dh1; // we make a copy of the reference... DataHold dh3 = (DataHold)testList.get(3); System.out.println(" Index of DataHold five : " + testList.indexOf(dh1)); // same as above... System.out.println(" dh1 is equal to dh2 : " + dh1.equals(dh2)); // are the two DataHold object "equal" ? System.out.println(" dh2 is equal to dh3 : " + dh2.equals(dh3)); // are the two DataHold object "equal" ? System.out.println(" Index of DataHold two : " + testList.indexOf("two"));// two is a String and not a // DataHold object, returns -1 } }
as you can see, the simple overridden equal method only check to see if two DataHold objects have the same String value for data...

remember if two things are equal to each other, the the reverse must be true... In you equals method, you are taking attempting to compare a String with you Pair object, and the two are not equal because they are different types...

Okay, this jumped out at me...

name == this.name

When comparing String values, you should use String's .equals() method, because it compares String values (characters) and not the String's (object) references...
name.equals(this.name)
you can also use String's equalsIgnoreCase() method, if you don't want the comparison to be case sensitive...

Originally posted by Justin Porter:
... I found out from the API that the indexOf method of the arraylist calls the "equals()" method to figure out if it found the right object or not. So that's why I wrote my own equals method. But that equals method is not getting called (I found that out from testing). So how can I make the indexOf() method call my equals() method? Any help would be appreciated!

Okay, so as you have noted that indexOf() method uses the equals() method...
Below is the signature of your equals() method...
public boolean equals(String name)
as you can see, your method takes a String as an arguement...
But, this is where the issue comes in, the ArrayList indexOf() method uses the equals method whose takes a Object as an argument...
public boolean equals(Object obj)
so basically you have overloaded the equals() method instead of overriding it...
your class now has two equals methods... the one inherited from Object and the overloaded one that you created...
public boolean equals(String name)// overloaded method public boolean equals(Object obj)// method inherited from object
to fix this, you need to override the inherited method, in essence change your method parameters to take an Object as an arguement instead of a String...

Hope this helps...

Originally posted by Lenny Leon:
I'm just starting out learning Java and need a little help. I'm supposed to take this truth table and alter it so it displays 1's and 0's instead of true false. I'm assumed to do this I would just need to change the variable type and replace true and false with 1 and 0 but every way I try this does not work. I would just like for someone to point me in the right direction. I would like an explanation so I could understand instead of just an awnser. Thanks in advance

okay, so break down what !p means...
! = a boolean operator that inverts the value of a boolean...
So...

if p is true then !p ( NOT p ) is false, otherwise...
if p is false then !P ( NOT p ) is true... Hmmm... the opposite...

so if you use integers... then you could look at it like this...

if p is 1 then !p ( NOT p) then p is 0, else
if p is 0 then !p ( NOT p) then p is ???
... you can take it from here...

now you got some of the logic, making it work should be easier...

Originally posted by Saravanan Jothimani:
Hi,

Please give me a detailed difference between String and StringBuffer

Thanks in Advance

Saravanan

Hmmm... to much typing...

how about this link...

http://java.sun.com/docs/books/tutorial/java/data/strings.html

from the Sun's Java Tutorial...

Originally posted by Alisha Burke:
Hi Liam....

So how do i get the vote button to be just below the textfield/label (that was my main problem actually)....and using the code that you gave me how come the textfields becomes large when i maximize the window(is it suppose to be that way?)

thx

The reason is that p2 uses a GridLayout, so all components end up being the same size and also fills out each of thier cells in the grid...

As for a possible solution, you can move the button to be in the same panel as your text fields, and you can also use GridBagLayout with GridBagConstraint classes to have more control over your components in panel2... This is a very simple example, but it will give you the idea...

import java.awt.*;//FOR GRAPHICS CLASS import java.applet.*;//FOR APPLET CLASS public class Apanel2 extends Applet { Label loveLabel; //Top Label Label girlsLabel; //Middle Label Label guysLabel; //Middle Label Label showLabel; //Bottom Label for voting results TextField girlsField; TextField guysField; Button voteButton; Panel p1; Panel p2; Panel p3; Panel p4; // panel to add our voteButton GridBagLayout gbly; GridBagConstraints gbcts; Insets ins; int gbcRELATIVE = GridBagConstraints.RELATIVE; int gbcREMAINDER = GridBagConstraints.REMAINDER; int gbcCENTER = GridBagConstraints.CENTER; int gbcNONE = GridBagConstraints.NONE; //INITIALIZE APPLET public void init() { setLayout(new GridLayout(2,1,2,2)); p1 = new Panel (); p1.setLayout(new BorderLayout(25,25)); p2 = new Panel (); ins = new Insets(0,0,0,0); gbcts = new GridBagConstraints(gbcRELATIVE,gbcRELATIVE ,gbcREMAINDER,10,0.0,1.0, gbcCENTER,gbcNONE,ins,0,0); gbly = new GridBagLayout(); p2.setLayout(gbly); p3 = new Panel (); p3.setLayout(new BorderLayout(25,25)); loveLabel=new Label ("LOVE VOTE"); p1.add("North",loveLabel); loveLabel.setFont(new Font("Peignot Demi",Font.BOLD,14)); girlsLabel=new Label ("Do you love him? "); gbly.setConstraints(girlsLabel,gbcts); p2.add(girlsLabel); girlsLabel.setFont(new Font("Copperplate Gothic 30AB",Font.BOLD,14)); girlsField=new TextField(9); gbly.setConstraints(girlsField,gbcts); p2.add(girlsField); guysLabel=new Label ("Do you love her? "); gbly.setConstraints(guysLabel,gbcts); p2.add(guysLabel); guysLabel.setFont(new Font("Peignot Demi",Font.BOLD,14)); guysField=new TextField(9); gbly.setConstraints(guysField,gbcts); p2.add(guysField); voteButton=new Button ("Vote"); gbly.setConstraints(voteButton,gbcts); p2.add(voteButton); showLabel=new Label ("Voting results: "); p1.add("South",showLabel); showLabel.setFont(new Font("Reporter No.2",Font.PLAIN,25)); //p3.add("North",p2); already adding p2 to p1, so this does nothing... p1.add("Center",p2); add(p1); add(p3); }//END init() }
here is used one setting for GridBagConstraints for all components in Panel p2 which is the reason that I did not use the no-arguement constructor for GridBagConstraints...
If you desire, you can change the constraints for each individual component as necessary...

for more info on using GridBagLayout check out this link...
http://java.sun.com/docs/books/tutorial/uiswing/layout/gridbag.html

it will give more info on customizing constraints for individual components...

have fun...

Double.valueOf(args[i]).doubleValue();

can anybody explain me about this line
I want to know whether string valueOf is converted to doubleValue() or any other way.

Thanks in Advance

Saravanan[/QB]
If you read the API for java.lang.Double class, you will see that Double.valueOf(string) will return a new Double containing that double value parsed from the String, the the .doubleValue() method is called on the new Double to return it's value as a primative double...
in essence that line is the same as...
Double myDoubleClass = Double.valueOf(args[i]); double myPrimativeDouble = myDoubleClass.doubleValue();

hope this helps...