How to separate GUI from logic in practice
Hello
I have programmed in other languages in the past, now I need to make a serious application in Java, and feel the need to make it easy to maintain in the future.
So I must separate the GUI from the logic, so if I change the GUI, my program continues working. And too to see better the way it works, so it doesn't become too complex to maintain.
How do I do this in Netbeans?
For example: I did a frame with a button. Then made a class called CloseButton with a public static method that exits. From the Frame class I import the package that contains CloseButton class.
In the code of the button I place a call to the method that exits.
Is this well done? How do you do to separate gui and logic? Can this be done better?
I suppose the starting point to an application with GUI is the class that makes the GUI. Isn't it? So the class constructs the GUI, and then I place other classes to be called from there and make it function.
In this example I isolated the logic of a button.
Please tell me how is this done in Java, if I am doing well or not, before I continue coding.
I am not sure at all, as I am not used to this.
Thanks.
Jordi
PD: Here is an example code of what I mean
/*
* HiperBrowserFrame.java
*
* Created on 25 de marzo de 2007, 18:54
*/
package frame3dbrowser;
import logic.*;
/**
*
* @author Administrador
*/
publicclass HiperBrowserFrameextends javax.swing.JFrame{
/** Creates new form HiperBrowserFrame */
public HiperBrowserFrame(){
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.
*/
// <editor-fold defaultstate="collapsed" desc=" Generated Code ">
privatevoid initComponents(){
jButton1 =new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jButton1.setText("jButton1");
jButton1.addActionListener(new java.awt.event.ActionListener(){
publicvoid actionPerformed(java.awt.event.ActionEvent evt){
jButton1ActionPerformed(evt);
}
});
org.jdesktop.layout.GroupLayout layout =new org.jdesktop.layout.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.add(68, 68, 68)
.add(jButton1)
.addContainerGap(587, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.add(45, 45, 45)
.add(jButton1)
.addContainerGap(309, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
privatevoid jButton1ActionPerformed(java.awt.event.ActionEvent evt){
CloseButton.closeThis();
}
/**
* @param args the command line arguments
*/
publicstaticvoid main(String args[]){
java.awt.EventQueue.invokeLater(new Runnable(){
publicvoid run(){
new HiperBrowserFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
// End of variables declaration
}
/*
* CloseButton.java
*
* Created on 25 de marzo de 2007, 19:08
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*/
package logic;
publicclass CloseButton{
publicstaticvoid closeThis(){
System.exit(0);
}
}
