La forma correcta de iniciar una aplicación en Java Swing

 

 

package com.edu4java.swing.tutrial6;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

public class LoginView4 extends JFrame{

	public static void main(String[] args) {
		new LoginView4();
	}

	public LoginView4() {
		super("Demo application");
		setSize(300, 150);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		placeComponents();
		setVisible(true);
	}
	
	private void placeComponents() {
		setLayout(null);

		JLabel userLabel = new JLabel("User");
		userLabel.setBounds(10, 10, 80, 25);
		add(userLabel);

		JTextField userText = new JTextField(20);
		userText.setBounds(100, 10, 160, 25);
		add(userText);

		JLabel passwordLabel = new JLabel("Password");
		passwordLabel.setBounds(10, 40, 80, 25);
		add(passwordLabel);

		JPasswordField passwordText = new JPasswordField(20);
		passwordText.setBounds(100, 40, 160, 25);
		add(passwordText);

		JButton loginButton = new JButton("login");
		loginButton.setBounds(10, 80, 80, 25);
		add(loginButton);

		JButton registerButton = new JButton("register");
		registerButton.setBounds(180, 80, 80, 25);
		add(registerButton);

		ActionListener myButtonListener = new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				JButton source = (JButton) e.getSource();
				JOptionPane.showMessageDialog(source, source.getText() + " button has been pressed");
				
			}
		};
		loginButton.addActionListener(myButtonListener);
		registerButton.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				JButton source = (JButton) e.getSource();
				JOptionPane.showMessageDialog(source, source.getText() + " button has been pressed");
			}
		});
	}
}

package com.edu4java.swing.tutrial6;

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

public class LoginView5 extends JFrame{

	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			@Override
			public void run() {
				new LoginView5();
			}
		});
	}

	public LoginView5() {
		super("Demo application");
		setSize(300, 150);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		placeComponents();
		setVisible(true);
	}
	
	private void placeComponents() {
		setLayout(null);

		JLabel userLabel = new JLabel("User");
		userLabel.setBounds(10, 10, 80, 25);
		add(userLabel);

		JTextField userText = new JTextField(20);
		userText.setBounds(100, 10, 160, 25);
		add(userText);

		JLabel passwordLabel = new JLabel("Password");
		passwordLabel.setBounds(10, 40, 80, 25);
		add(passwordLabel);

		JPasswordField passwordText = new JPasswordField(20);
		passwordText.setBounds(100, 40, 160, 25);
		add(passwordText);

		JButton loginButton = new JButton("login");
		loginButton.setBounds(10, 80, 80, 25);
		add(loginButton);

		JButton registerButton = new JButton("register");
		registerButton.setBounds(180, 80, 80, 25);
		add(registerButton);

		ActionListener myButtonListener = new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				JButton source = (JButton) e.getSource();
				JOptionPane.showMessageDialog(source, source.getText() + " button has been pressed");
				
			}
		};
		loginButton.addActionListener(myButtonListener);
		registerButton.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				JButton source = (JButton) e.getSource();
				JOptionPane.showMessageDialog(source, source.getText() + " button has been pressed");
			}
		});
	}
}

 

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