[英]Changing from JFrame to JApplet
我正在嘗試將使用JFrame制作的某些Java應用程序更改為JApplets,以便可以將它們放置在我也嘗試制作的網站上。 我只是想知道要在程序中更改哪些內容才能實現此目的。 這是其中一個程序的示例(我嘗試通過更改擴展名和某些屬性來運行該程序,但是在進程仍在運行時它消失了):
import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.*;
@SuppressWarnings("serial")
public class Snake extends JApplet//extends JFrame
{
private Panel panel;
Dimension x = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
private final int SCALER = 25, LENGTH = (int) x.getWidth()/SCALER-1,
HEIGHT = (int) x.getHeight()/SCALER-1;
public static void main(String[] args)
{
new Snake();
}
public Snake()
{
//setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(x);
//setTitle("SNAKE");
//setResizable(false);
panel = new Panel(20,20,SCALER);
add(panel, BorderLayout.CENTER);
Handler handler = new Handler();
addKeyListener(handler);
setVisible(true);
}
private class Handler implements KeyListener
{
public void keyPressed(KeyEvent e)
{
switch (e.getKeyCode())
{
case KeyEvent.VK_LEFT:
panel.pass(270);
break;
case KeyEvent.VK_RIGHT:
panel.pass(90);
break;
case KeyEvent.VK_UP:
panel.pass(0);
break;
case KeyEvent.VK_DOWN:
panel.pass(180);
break;
}
}
public void keyReleased(KeyEvent e)
{
}
public void keyTyped(KeyEvent e)
{
}
}
}
使用此代碼,您可以同時擁有兩個版本(JFrame和JApplet)
public class Snake extends JApplet
{
public static void main(String[] args)
{
// JFrame
JFrame frame = new JFrame();
frame.setTitle("Snake");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Applet
JApplet applet = new Snake();
applet.init();
// Insert the Applet into JFrame
frame.getContentPane().add(applet);
frame.pack();
frame.setVisible(true);
}
...
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