如何将Application转换成Applet.

Question

把main()函数中语句放如JApplet的init()函数中让Calculator继承JApplet

Answer 1

import java.awt.*
import java.awt.event.*
import javax.swing.*public class Calculator JApplet
{ Frame f=new Frame("事件处理范例--计算机");
 TextField tf=new TextField(30);
 Panel p=new Panel();
 String btn[]={"0","1","2","3","4","5","6","7","8","9","+","-","*","/","=","."};
 Button b[]=new Button[16]; public init(
  {
   Calculator Cal1=new Calculator();
   Cal1.go();
  } 
 
 public void go()
  {
   f.setSize(300,200);
   Font ft=new Font("Times",Font.PLSIN,24);
   p.setFont(ft);
   p.setLayout(new GridLayout(4,4));
   tf.setFont(ft);
   f.add(tf,BorderLayout.NORTH);
   for (int i=0; i<btn.length; i++)
     {
      b[i]=new Button(btn[i]);
      p.add(b[i]);
      }
   f.add(p,BorderLayout.CENTER);
   f.setVisible(true);
   }
}

Answer 2

import java.awt.*;
import javax.swing.*;
public class CalculatorApplet extends JApplet  { /* (non-Javadoc)
 * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
 */
 



public CalculatorApplet() {

}

Frame f=new Frame("事件处理范例--计算机");
 TextField tf=new TextField(30);
 Panel p=new Panel();
 String btn[]={"0","1","2","3","4","5","6","7","8","9","+","-","*","/","=","."};
 Button b[]=new Button[16]; public void init()        
 {
  
   go();
  } 
 
 public void go()
  {
   f.setSize(300,200);
   Font ft=new Font("Times",Font.PLAIN,24);
   p.setFont(ft);
   p.setLayout(new GridLayout(4,4));
   tf.setFont(ft);
   f.add(tf,BorderLayout.NORTH);
   for (int i=0; i<btn.length; i++)
 {
  b[i]=new Button(btn[i]);
  p.add(b[i]);
  }
   f.add(p,BorderLayout.CENTER);
   f.setVisible(true);
   }    
}

Answer 3

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.TextField;import javax.swing.JApplet;
import javax.swing.JPanel;public class Calculator extends JApplet
{
TextField tf = new TextField(30);
String btn[] =
{
"0",
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
"+",
"-",
"*",
"/",
"=",
"." };
Button b[] = new Button[16]; public void init()
{
JPanel p = new JPanel ();
p.setSize(300, 200);
Font ft = new Font("Times", Font.PLAIN, 24);
p.setFont(ft);
p.setLayout(new GridLayout(4, 4));
tf.setFont(ft);
getContentPane ().add(tf, BorderLayout.NORTH);
for (int i = 0; i < btn.length; i++)
{
b[i] = new Button(btn[i]);
p.add(b[i]);
}
getContentPane ().add (p, BorderLayout.CENTER);
}
}