Resultado query na interface grafica

import java.awt.<em>;

import java.awt.event.</em>;

import javax.swing.<em>;

import java.lang.</em>;

import java.net.URL;

import java.sql.<em>;

import <a href="http://java.io">java.io</a>.</em>;

JLabel l1;
JTextField t1;
JButton b1;	

public BuscaNome() {
	
	setLayout (new GridLayout(10,5));
	
	l1 = new JLabel("Nome do cliente: ");
	t1 = new JTextField(50);
	b1 = new JButton("Buscar");
	
	b1.addActionListener(this);
	
	add(l1);
	add(t1);
	add(b1);    	
}

public void actionPerformed(ActionEvent event) {
	janela ap = new janela();
	ap.sair();				
}

public static void main(String args[]) throws IOException{
	
		BuscaNome janela = new BuscaNome();
		janela.setTitle("busca de cliente");
		janela.pack();
		janela.show();    		
	}
	
	class janela{
		janela(){    			
		}
		
		public void sair(){
			try{
				//conexão com o banco de dados
				String url = "jdbc:mysql://localhost:3306/banco";
		        String user = "root";
		        String password = "root";
		        Connection conexao = DriverManager.getConnection(url, user, password);
		        Class.forName("com.mysql.jdbc.Driver");
		        //inicia a conexão
		        Statement st = conexao.createStatement();
		        
		        //SQL			       
		        
		        String sql = "SELECT * FROM teste WHERE nome LIKE '"+ t1.getText() +"' ";
				Statement stat = conexao.createStatement();
				ResultSet set = stat.executeQuery(sql);
				while(set.next()){
					String titulo = set.getString("NomeAg");
					System.out.println(titulo);
		        
		        
		        
		        st.close();
		        conexao.close();			        
			}
		    catch (Exception e) {
		       e.printStackTrace();
		       return;
	        }
	        System.exit(0);
		}
	}