import java.applet.Applet;
import java.awt.*;
import java.awt.Choice;
import java.awt.Checkbox;
import java.awt.Label;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.Event;

public class DBVMetric extends Applet {

  /* You'll need access to t from the handleCheckbox
   method so make it a member variable. */
  TextField t;
    float price = 7.00f;

  public void init() {
    //setFont(new Font("Arial", Font.BOLD, 18));
    add(new Label("   Select Which Metrics To Set   ",Label.RIGHT));
    add(new Checkbox("TableSpace Free Space"));
    add(new Checkbox("TableSpace Status"));
    add(new Checkbox("Redo Log Status"));
    add(new Checkbox("Data Cache Hit Ratio"));
    add(new Checkbox("Rollback Segments"));
    add(new Checkbox("Archive Status"));
    add(new Checkbox("Latch Get-Miss"));
    add(new Label(" Metric String: ", Label.LEFT));
    add(new TextField(40));
    add(new Label(" Environment String: ", Label.LEFT));
    add(new TextField(35));
    add(new Label(" Limit String: ", Label.LEFT));
    add(new TextField(40));
    t = new TextField(String.valueOf(price));
    t.setEditable(true);
    add(t);
    Choice ch = new Choice();
    ch.addItem(" Instance #1 (SID/db) ");
    ch.addItem(" Instance #2 (SID/db) ");
    ch.addItem(" Instance #3 (SID/db) ");
    add(ch);
    setFont(new Font("Helvetica", Font.BOLD, 14));
  }
  
  public boolean action(Event e, Object o) {
    if (e.target instanceof Checkbox) {
      handleCheckbox((Checkbox) e.target);
    }
    return true;
  }

  private void handleCheckbox(Checkbox c) {
  
    if (c.getState()) price += 0.50f;
    else price -= 0.50f;
    // Change the price
    t.setText(String.valueOf(price));
  }
}