带滚动条的小程序

Question

我在下面有这个代码;我试图在用户拖动“滚动条”时显示年龄，电影价格和价格，请指导我如何使其工作。

import java.awt.*;
import java.applet.Applet;
import java.awt.event.*;
import java.text.*;
import java.awt.event.AdjustmentEvent;
import java.awt.event.*;

public class CinemaPrice extends Applet implements AdjustmentListener{
public static void main(String [ ] args){}
    // declarations

    Label enterPatronageLabel;
    Scrollbar enterPatronageScrollbar;
    int AgeOfPatron;

    Label selectedAgeLabel;
    TextField selectedAgeTextField;

    Label admissionRateLabel;
    TextField admissionRateTextField;
    char admissionRate;

    Label admissionPriceLabel;
    TextField admissionPriceTextField;
    double admissionPrice;

    // controls
    Button enterButton;
    Button clearButton;


    public void init()
    {
        setLayout(null);

        /*
            (Scrollbar.HORIZONTAL, 0, 1, 0, 100)
             starting position is 0, page size is 1, minimum is 0 and maximum is 100.
        */

        enterPatronageLabel = new Label("Enter Patronage Name:");
        enterPatronageLabel.setBounds(50, 50, 130, 20);
        add(enterPatronageLabel);

        enterPatronageScrollbar = new Scrollbar(Scrollbar.HORIZONTAL, 0, 1, 0, 100);
        enterPatronageScrollbar.setBounds(230, 50, 100, 20);
        add(enterPatronageScrollbar);
        enterPatronageScrollbar.addAdjustmentListener(this);

        selectedAgeLabel = new Label("Selected Age:");
        selectedAgeLabel.setBounds(50, 80, 150, 20);
        add(selectedAgeLabel);

        selectedAgeTextField = new TextField(5);
        selectedAgeTextField.setBounds(230,80, 50, 20);
        add(selectedAgeTextField);

        admissionRateLabel = new Label("Admission Rate:");
        admissionRateLabel.setBounds(50, 110, 100, 20);
        add(admissionRateLabel);

        admissionRateTextField = new TextField(5);
        admissionRateTextField.setBounds(230, 110, 100, 20);
        add(admissionRateTextField);

        admissionPriceLabel = new Label("Admission Price:");
        admissionPriceLabel.setBounds(50, 140, 150, 20);
        add(admissionPriceLabel);

        admissionPriceTextField = new TextField(5);
        admissionPriceTextField.setBounds(230, 140, 50, 20);
        add(admissionPriceTextField);

        // controls
        enterButton = new Button("Enter");
        add(enterButton);
        enterButton.setBounds(50, 320, 100, 20);
        enterButton.addActionListener(this);

        clearButton = new Button("Clear");
        add(clearButton);
        clearButton.setBounds(200, 320, 100, 20);
        clearButton.addActionListener(this);

        }
        public void actionPerformed(ActionEvent event)
        {
        if (event.getSource() == enterButton)
        {
        AgeOfPatron = enterPatronageScrollbar.getValue();
        }
        if (event.getSource() == clearButton)
        {
        selectedAgeTextField.setText("");
        selectedAgeTextField.requestFocusInWindow();
        admissionRateTextField.setText("");
        admissionPriceTextField.setText("");

        }
        }

    public void adjustmentValueChanged(AdjustmentEvent e)

        {
            AgeOfPatron = enterPatronageScrollbar.getValue();
            selectedAgeTextField.setText("" + AgeOfPatron);
            System.out.println(admissionPrice);
            System.out.println(admissionRate);

     if(AgeOfPatron > 0 || AgeOfPatron < 5)
        {

            admissionPriceTextField.setText("$0.00");
            admissionRateTextField.setText("Free");
        }
    else if(AgeOfPatron > 5 || AgeOfPatron < 12)
            {
            admissionPriceTextField.setText("$4.25");
            admissionRateTextField.setText("Half Price");
            }
    else if(AgeOfPatron > 12 || AgeOfPatron < 54)
            {
            admissionPriceTextField.setText("$8.50");
            admissionRateTextField.setText("Full Price");
            }
    else if(AgeOfPatron > 55)
            {
            admissionRateTextField.setText("$0.00");
            admissionPriceTextField.setText("Free");
            }
        repaint();

        }
}