I’m starting to learn Java with the layers model (GUI, business logic, and persistance) and can’t accomplish the implementation of the GUI properly. I’ve the logic and the GUI designed with swing, which works and displays all components properly when using the preview option on the form designer, but the problem cames when i try to handle the gui with the logic handler, which is how it should work naturally, but it opens an empty panel without any components, and almost invisible so i can’t even drag it and had to assign it a fixed size. I’m starting to doubt if maybe is a compatibility problem Linux Mint, but i don’t think so.
It’s Funny because it’s a mini project i was trying to replicate, and thought that it would be easy, but maybe i’m stuck because instead of using NetBeans I selected IntelliJ.
logic handler:
package logic;
import igu.jFrame;
public class logic {
public static void main (String[] args) {
jFrame ventana = new jFrame();
ventana.setVisible(true);
ventana.setSize(600, 600);
ventana.setLocationRelativeTo(null);
}
}
GUI Code:
public class jFrame extends javax.swing.JFrame {
public JTextField input; // the user inputs a message that wants to copy
public JPanel jframe; // main and unique panel
public JButton copyBtn; // the button that triggers the copy action
public JLabel output; // where the input text should be copied
public JButton clearBtn; // the button that should clear the input and output components
public jFrame() {
copyBtn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String mensaje = input.getText();
output.setText(mensaje);
}
});
clearBtn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
input.setText("");
output.setText("");
}
});
}
}
user28614451 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
2
The problem in your code is you have declared components but have not initialized and added to the jframe correctly. To do that in jFrame constructor i have initialized each component and added them to a panel and added the panel to jFrame. lso , to ensure that when you close the application program ends correctly i have added defaultcloseoperation .
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class jFrame extends javax.swing.JFrame {
public JTextField input;
public JPanel jframe;
public JButton copyBtn;
public JLabel output;
public JButton clearBtn;
public jFrame() {
// Initialize the declared components
input = new JTextField(20);
copyBtn = new JButton("Copy");
clearBtn = new JButton("Clear");
output = new JLabel("Your output area");
jframe = new JPanel();
// Add the initialized components to the panel
jframe.add(input);
jframe.add(copyBtn);
jframe.add(clearBtn);
jframe.add(output);
// Add the panel to the JFrame
this.add(jframe);
// Set frame properties for closing operation
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
copyBtn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String mensaje = input.getText();
output.setText(mensaje);
}
});
clearBtn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
input.setText("");
output.setText("");
}
});
}
}
Arf_code is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Your code have some missing…
package logic;
import igu.jFrame;
public class logic {
public static void main( String[] args ) {
// create the "Gui" on the events thread
SwingUtilities.invokeLater( () -> {
jFrame ventana = new jFrame();
ventana.setLocationRelativeTo( null );
ventana.setSize( 600, 600 );
// Last one made by the constructor or after him
ventana.setVisible( true );
});.
}
}
// change name since "JFrame" is the name of a Swing class, so it can generate errors
public class MyClass extends javax.swing.JFrame {
public JTextField input;
// change name of **JPanel jframe** to **panel** to avoid confusion
public JPanel panel;
public JLabel output;
public JButton copyBtn;
public JButton clearBtn;
public MyClass() {
// we call Super, and pass it the name of the application, so that it is visible in the bar
super( "MyClass" );
// create the elements
input = new JTextField();
panel = new JPanel;
// etc...
// set components
input.setText( "Hello!" );
panel.setBackground( new Color( 110, 110, 110 ));
// add to "panel" the inner elements
panel.add( input );
panel.add( input );
// etc...
// add to "frame" the "panel"
add( input );
copyBtn.addActionListener( new ActionListener() {
@Override
public void actionPerformed( ActionEvent e ) {
String mensaje = input.getText();
output.setText( mensaje );
}
} );
clearBtn.addActionListener( new ActionListener() {
@Override
public void actionPerformed( ActionEvent e ) {
input.setText( "" );
output.setText( "" );
}
} );
}
}