Exibir código-fonte para Swing:Exemplo Locadora parte 1

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import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JSeparator;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class LocadoraSwing extends JFrame {
	private final static int marginLeft = 20;
	private final static int marginMeio = 220;
	private final static int paddingTop = 40;
	private static int top = 20;
	private List<Carro> garagem;
	
	public LocadoraSwing(String title){
		super(title);
		garagem = new ArrayList<Carro>();
		
		setBounds(100,100,500,400);
		setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
		inicializaGaragem();
		getContentPane().setLayout(null);
		
		JLabel nomeLbl = new JLabel("Escolha um carro:");
		nomeLbl.setBounds(marginLeft,top,200,30);
		add(nomeLbl);
		
		JTextField precoTxt = new JTextField();
		
		JComboBox jc = new JComboBox(garagem.toArray());
		jc.insertItemAt("--Selecione--", 0);
		jc.setSelectedIndex(0);
		jc.setBounds(marginMeio,top,200,30);
		jc.addActionListener(new ActionListener() {			
			@Override
			public void actionPerformed(ActionEvent e) {
				if(jc.getSelectedIndex()!=0){
					Carro c = (Carro)jc.getSelectedItem();
					precoTxt.setText(c.getDiaria()+"");
				}
			}
		});			
		add(jc);
		top+=paddingTop;
		
		JLabel precoLbl = new JLabel("Preço da diária");
		precoLbl.setBounds(marginLeft,top,200,30);
		add(precoLbl);
		
		precoTxt.setBounds(marginMeio,top,200,30);
		add(precoTxt);
		
		top+=paddingTop;
		
		JLabel descLbl = new JLabel("Desconto:");
		descLbl.setBounds(marginLeft,top,200,30);
		add(descLbl);
		
		JTextField descTxt = new JTextField();
		descTxt.setBounds(marginMeio,top,200,30);
		descTxt.setText("0.0");
		add(descTxt);
		
		top+=paddingTop;
		
		JSeparator sep = new JSeparator();
		sep.setBounds(marginLeft, top, 400, 5);
		add(sep);
		
		top+=this.paddingTop;
		
		JLabel valorFinalRSLbl = new JLabel();
		
		JButton jb = new JButton("Calcular");
		jb.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				Double preco = Double.parseDouble(precoTxt.getText());
				Double desc = Double.parseDouble(descTxt.getText());
				Double precoFinal = preco - desc;
				valorFinalRSLbl.setText("R$ "+precoFinal+"");
			}
		});
		jb.setBounds(marginLeft,top,150,30);
		add(jb);
		
		top+=this.paddingTop;top+=this.paddingTop;
		
		JLabel valorLbl = new JLabel("Valor final:");
		valorLbl.setBounds(marginLeft,top,200,30);
		add(valorLbl);
		
		valorFinalRSLbl.setBounds(marginMeio,top,200,30);
		add(valorFinalRSLbl);
				
	}
	public void inicializaGaragem(){
		Carro fusca = new Carro("Fusca",75d,"C");
		Carro jetta = new Carro("Jetta",140d,"A");
		Carro gol = new Carro("Gol",90d,"B");
		
		garagem.add(fusca);
		garagem.add(gol);
		garagem.add(jetta);
	}

	public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException, UnsupportedLookAndFeelException {
//		UIManager.setLookAndFeel("com.jtattoo.plaf.smart.SmartLookAndFeel");
		
		LocadoraSwing s = new LocadoraSwing("Locadora de carro");
		s.setVisible(true);
		s.setResizable(false);
		
	}
	
}

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