Intermediate Java(25) - Finishing the Oval Slider Program

In TheWindows.class

import java.awt.*;

import javax.swing.*;

import javax.swing.event.*;

public class TheWindow extends JFrame {

private JSlider slider;

private DrawOval myPanel;

public TheWindow(){

super("The Title");

myPanel = new DrawOval();

myPanel.setBackground(Color.orange);

slider = new JSlider(SwingConstants.HORIZONTAL,0,200,10);

slider.setMajorTickSpacing(10);

slider.setPaintTicks(true);

slider.addChangeListener( → 檢查Slider有沒有改變

new ChangeListener(){

public void stateChanged(ChangeEvent e){ → 當Slider改變任何狀態

myPanel.setD(slider.getValue()); → slider的值是myPanel內setD的值

}

}

);

add(slider,BorderLayout.SOUTH); → slider放在下面

add(myPanel,BorderLayout.CENTER); → myPanel 放在中間

}

}

In apples.class:

import javax.swing.*;

public class apples{

public static void main(String[] args){

TheWindow w = new TheWindow();

w.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

w.setSize(230,280);

w.setVisible(true);

}

}

這是運行時的結果:  

你可以拖動slider，並更大或更小繪製橢圓形