Programming Forums > Application Development > Java

Kilo · Feb 24th, 2006, 5:20 PM

@titaniumdecoy: thanks a ton for your help with component layouts.

New Questions:

Im having fun with my new good looking button... with one problem i need to take control of it? Example-> JButton1_Click or Button_Down. How do i take control of component events???

Aside from Scanner class is there an entire class deticated to file i/o? If not what is the highly recommended class for performing this operation.

titaniumdecoy · Feb 24th, 2006, 5:54 PM

Create a class that extends JButton and implements ActionListener:

(Toggle Plain Text)

import javax.swing.JButton;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

class MyButton extends JButton implements ActionListener {
	// Constructor
	MyButton() {
		super("Press me!");
		addActionListener(this);
	}
	// Implement the actionPerformed method
	// This is an abstract method in ActionListener
	public void actionPerformed(ActionEvent arg0) {
		// Do something when pressed
	}
}

It is common practice for such a class to be an inner class (so, for example, you would copy and paste the code above into the class that will be using it, and create an instance of MyButton instead of JButton).

If you need to know more than just when the button is pressed, you can implement MouseListener.

Here is a simple example of I/O that reads the first line of file.in and writes it to file.out.

(Toggle Plain Text)

import java.io.*;
class IOTest {
  public static void main (String [] args) throws IOException {
	RandomAccessFile f = new RandomAccessFile ("file.in", "r");
	PrintWriter out = new PrintWriter(
			new BufferedWriter(
			new FileWriter("file.out")));
	String firstLine = f.readLine();
	out.print(firstLine);
	out.close();
  }
}

ReggaetonKing · Feb 24th, 2006, 7:04 PM

my man titaniumdecoy knows his Java, how long you've been programming in Java man?

titaniumdecoy · Feb 24th, 2006, 7:42 PM

About five years, since I was 13. I'm taking Computer Science AP this year at school (senior year!) which is taught in Java, so that helps.

ReggaetonKing · Feb 24th, 2006, 7:45 PM

next year, I'm a junior now, I am taking that class, the teacher was suprised when I passed the Intro to Java final exam with a 92%. Everyone in my school hates Java, thats b/c they do bullshit programs like working with other program, like this one called "Programming with Alice". 5 years huh? How long it take you to learn the Java itself and create kool looky GUI, which I am trying to learn now

,?

titaniumdecoy · Feb 24th, 2006, 8:06 PM

I always hated Java GUIs, I've never made any worthwhile interface in Java. The layout managers suck ***, and I don't have the patience to position each item with coordinates. I learned Java from Beginning Java by Ivor Horton. It's a fat book.

jaeusm · Feb 24th, 2006, 8:12 PM

Quote:

I always hated Java GUIs, I've never made any worthwhile interface in Java. The layout managers suck ***, and I don't have the patience to position each item with coordinates.

I've never had an affinity for GUI programming in any language, but there are some tools available to ease Java GUI development.

ReggaetonKing · Feb 24th, 2006, 8:27 PM

I personally like the GUI develop C#/ VB have, it mades things a lot easier!

Kilo · Feb 24th, 2006, 8:41 PM

woot thanks a ton bro! the button works great... but ofcourse one problem leads to another... next step! before i use file i/o i need to be able to take control of the text in the JTextField so that i could pass it a function.

Oh another thing! when it comes time to use the fileName String (the variable passed to my function) do i replace file.in with the string name?

Kilo · Feb 24th, 2006, 8:43 PM

[php]
RandomAccessFile f = new RandomAccessFile ("C:\fileName.txt", "r");
PrintWriter out = new PrintWriter(
new BufferedWriter(
new FileWriter("C:\fileOut.txt")));
String firstLine = f.readLine();
out.print(firstLine);
out.close();
[/php]

Like this?

Feb 24th, 2006, 5:20 PM	#1
Kilo Expert Programmer Join Date: Nov 2005 Location: In Pink Clam? Posts: 542 Rep Power: 0	Java Questions @titaniumdecoy: thanks a ton for your help with component layouts. New Questions: Im having fun with my new good looking button... with one problem i need to take control of it? Example-> JButton1_Click or Button_Down. How do i take control of component events??? Aside from Scanner class is there an entire class deticated to file i/o? If not what is the highly recommended class for performing this operation. __________________ "When in Rome, Do as the Romans Do" "Beauty is in the eye of the BEER holder" "Save your breath your going to need it for your blow up doll later" SearchLores.org

Feb 24th, 2006, 5:54 PM	#2
titaniumdecoy Expert Programmer Join Date: Nov 2005 Posts: 855 Rep Power: 3	Create a class that extends JButton and implements ActionListener: (Toggle Plain Text) import javax.swing.JButton; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; class MyButton extends JButton implements ActionListener { // Constructor MyButton() { super("Press me!"); addActionListener(this); } // Implement the actionPerformed method // This is an abstract method in ActionListener public void actionPerformed(ActionEvent arg0) { // Do something when pressed } } import javax.swing.JButton; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; class MyButton extends JButton implements ActionListener { // Constructor MyButton() { super("Press me!"); addActionListener(this); } // Implement the actionPerformed method // This is an abstract method in ActionListener public void actionPerformed(ActionEvent arg0) { // Do something when pressed } } It is common practice for such a class to be an inner class (so, for example, you would copy and paste the code above into the class that will be using it, and create an instance of MyButton instead of JButton). If you need to know more than just when the button is pressed, you can implement MouseListener. Here is a simple example of I/O that reads the first line of file.in and writes it to file.out. (Toggle Plain Text) import java.io.; class IOTest { public static void main (String [] args) throws IOException { RandomAccessFile f = new RandomAccessFile ("file.in", "r"); PrintWriter out = new PrintWriter( new BufferedWriter( new FileWriter("file.out"))); String firstLine = f.readLine(); out.print(firstLine); out.close(); } } import java.io.; class IOTest { public static void main (String [] args) throws IOException { RandomAccessFile f = new RandomAccessFile ("file.in", "r"); PrintWriter out = new PrintWriter( new BufferedWriter( new FileWriter("file.out"))); String firstLine = f.readLine(); out.print(firstLine); out.close(); } }

Feb 24th, 2006, 7:04 PM	#3
ReggaetonKing Sexy Programmer Join Date: Nov 2005 Location: New Jersey Posts: 891 Rep Power: 3	my man titaniumdecoy knows his Java, how long you've been programming in Java man? __________________ I would love to change the world, but they won't give me the source code!

Feb 24th, 2006, 7:45 PM	#5
ReggaetonKing Sexy Programmer Join Date: Nov 2005 Location: New Jersey Posts: 891 Rep Power: 3	next year, I'm a junior now, I am taking that class, the teacher was suprised when I passed the Intro to Java final exam with a 92%. Everyone in my school hates Java, thats b/c they do bullshit programs like working with other program, like this one called "Programming with Alice". 5 years huh? How long it take you to learn the Java itself and create kool looky GUI, which I am trying to learn now ,? __________________ I would love to change the world, but they won't give me the source code!

Feb 24th, 2006, 8:27 PM	#8
ReggaetonKing Sexy Programmer Join Date: Nov 2005 Location: New Jersey Posts: 891 Rep Power: 3	I personally like the GUI develop C#/ VB have, it mades things a lot easier! __________________ I would love to change the world, but they won't give me the source code!

Feb 24th, 2006, 7:42 PM	#4
titaniumdecoy Expert Programmer Join Date: Nov 2005 Posts: 855 Rep Power: 3	About five years, since I was 13. I'm taking Computer Science AP this year at school (senior year!) which is taught in Java, so that helps.

Feb 24th, 2006, 8:06 PM	#6
titaniumdecoy Expert Programmer Join Date: Nov 2005 Posts: 855 Rep Power: 3	I always hated Java GUIs, I've never made any worthwhile interface in Java. The layout managers suck ***, and I don't have the patience to position each item with coordinates. I learned Java from Beginning Java by Ivor Horton. It's a fat book.

Feb 24th, 2006, 8:41 PM	#9
Kilo Expert Programmer Join Date: Nov 2005 Location: In Pink Clam? Posts: 542 Rep Power: 0	woot thanks a ton bro! the button works great... but ofcourse one problem leads to another... next step! before i use file i/o i need to be able to take control of the text in the JTextField so that i could pass it a function. Oh another thing! when it comes time to use the fileName String (the variable passed to my function) do i replace file.in with the string name? __________________ "When in Rome, Do as the Romans Do" "Beauty is in the eye of the BEER holder" "Save your breath your going to need it for your blow up doll later" SearchLores.org

Feb 24th, 2006, 8:43 PM	#10
Kilo Expert Programmer Join Date: Nov 2005 Location: In Pink Clam? Posts: 542 Rep Power: 0	[php] RandomAccessFile f = new RandomAccessFile ("C:\fileName.txt", "r"); PrintWriter out = new PrintWriter( new BufferedWriter( new FileWriter("C:\fileOut.txt"))); String firstLine = f.readLine(); out.print(firstLine); out.close(); [/php] Like this? __________________ "When in Rome, Do as the Romans Do" "Beauty is in the eye of the BEER holder" "Save your breath your going to need it for your blow up doll later" SearchLores.org

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Programming Forums > Application Development > Java

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