Soma com Label

import java.awt.<em>;

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

public class Prova1 extends Frame

{

public Label L1, L2,L3;

public Button B1;

public TextField Tx1, Tx2;

public Dimension dim;

public Prova1()

{
	dim = new Dimension(290,100);
   
	setSize(dim);		
	setLocation(220,180);		
	setTitle("Soma");		
	setBackground(Color.black);		
	setLayout(new FlowLayout());
	
	
	
	L1 = new Label(" +");
	L1.setBackground(new Color(100,150,200));
			
	Tx1 = new TextField ("     ");
	
	L2 = new Label (" =");
	L2.setBackground(new Color(100,150,200));
	
	
	Tx2 = new TextField ("     ");
	
	B1 = new Button(" Calcular");
	B1.setBackground(new Color(100,150,200));
	
	L3 = new Label ("                 ");
	L3.setBackground(new Color(100,150,200));
	
	 
	
	add (Tx1);
	add (L1);
	add (Tx2);
	add (L2);
	add (L3);
	add (B1);
	
	
	addWindowListener (new FechaJanela());
	
}
public static void main(String[] args)
{
	new Prova1().show();
}