Use a user inputed variable as a rectangles height

Hi, I am trying to make a Java Applet where the user can input a number then a rectangle would be shown on the screen that is the height that the user entered and Im having trouble working out what to do. I rather new to Java as well. Here is the code for my program:

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class GraphGenerator extends Applet implements Runnable {
	Thread t;
	int c=0,inputfinal;
	Label lab1;
	TextField text1;
	Button okButton;
	
	public void init(){
		t = new Thread(this);
		t.start();
lab1 = new Label("Enter a number");
add(lab1);
text1 = new TextField(20);
add(text1);
okButton = new Button("Update");
add(okButton);
	}
	public void run(){
		while(true){
			c++;
			repaint();
			try {t.sleep(1000/30);}
			catch(InterruptedException e){;}
		}
	}

	public void paint(Graphics g){
		g.drawString("You typed: "+text1.getText(),10,100);
		g.drawString("c = "+c,10,120);
		g.drawRect(10, 200, 20, inputfinal);
	}
	public void actionPerformed(ActionEvent e){
		if (e.getSource() == okButton){
			String input = text1.getText();
			inputfinal = Integer.parseInt(input);
			repaint(); }
	}
}