Java开发网 - Applet中怎样在初始化的时候显示按钮？？？

Topic: Applet中怎样在初始化的时候显示按钮？？？

1.Applet中怎样在初始化的时候显示按钮？？？	Copy to clipboard
Posted by: zc_218 Posted on: 2005-12-02 15:43 我设置的按钮在程序初始化的时候无法显示，只有当鼠标单击按钮所在位置时才出现，请问怎样解决？？？？

2.Re:Applet中怎样在初始化的时候显示按钮？？？ [Re: zc_218]	Copy to clipboard
Posted by: yingjia53 Posted on: 2005-12-04 13:35 把你得程序写出来·

3.Re:Applet中怎样在初始化的时候显示按钮？？？ [Re: zc_218]

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Posted by: Infinite
Posted on: 2005-12-06 13:05

这个问题我在编程的时候也遇到了，同样请教中~~如下我的程序：

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Main extends JFrame
{
  final static int WIDTH=600,HEIGHT=800;
  final static int MH=400,MW=300;
static double a=1.0;
  static int n;
  static double x,x1;
  JTextField tone=new JTextField("1.0",4);
  JTextField ttwo=new JTextField(4);
  Container content=getContentPane();
//========= define the function ===============
double f(double i){
  i=a;
  return 5/(i*i+x*x); //return MH-(30*5/(i*i+x*x));
  }
  //=========
  double f1(double i){
  i=a;
  return 5/(i*i+x1*x1); //return MH-(30*5/(i*i+x1*x1));
  }
//=========
double l(){
  double sum=0;
  double temp=1.0;
  double xk,xj;
  for (int k=0;k<=n ;k++ )
  {
    for (int j=0;j<=n;j++)
    {
      if(j==k) j++;
      xk=-5+k*(double)10/(double)n;
      xj=-5+j*(double)10/(double)n;
temp=temp*((x-xj)/(xk-xj));
    }
    sum=sum+f(a)*temp;
   temp=1.0;
  }
return sum;
  }
//=========
  double ltwo(){
  double sum=0;
  double temp=1.0;
  double xk,xj;
  for (int k=0;k<=n ;k++ )
  {
    for (int j=0;j<=n;j++)
    {
      if(j==k) j++;
      xk=-5+k*((double)10/(double)n);
      xj=-5+j*((double)10/(double)n);
temp=temp*((x1-xj)/(xk-xj));
    }
    sum=sum+f(a)*temp;
   temp=1.0;
  }
return sum;
  }
//========= construct function ===============
  public Main()
  {
    JPanel pone=new JPanel();
   JButton a=new JButton("a");
   JButton n=new JButton("n");
JButton submit=new JButton("submit");
    //setBackground(new Color(0x71,0xA6,0xF4));
   content.setLayout(new FlowLayout());
//========== pone init =============================
    pone.setLayout(new GridLayout(1,4));
    submit.addActionListener(new DrawListener());
    submit.setBackground(new Color(0x93,0xC3,0xBB));
    a.setBackground(new Color(0x93,0xC3,0xBB));
    n.setBackground(new Color(0x93,0xC3,0xBB));
   pone.add(a); pone.add(tone); pone.add(n); pone.add(ttwo); pone.add(submit);
//========================================================
    content.add(pone);
    setLocation(320,100);
    setSize(WIDTH,HEIGHT);
    setResizable(false);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
  }

public void paint(Graphics g)
{
  int number=0;
//=========== draw the "reference frame" ===============
  g.drawString("0",MW+5,MH+14); // 0
  g.drawLine(20,MH,WIDTH-20,MH); //x below 25=1CM
  g.drawLine(WIDTH-20,MH,WIDTH-25,MH+5);
  g.drawLine(WIDTH-20,MH,WIDTH-25,MH-5);
  g.drawString("x",WIDTH-20,MH+12);
  g.drawString("5",MW+25*5,MH+12);
  g.drawLine(MW+25*5,MH,MW+25*5,MH-5);
  g.drawString("-5",MW-25*5,MH+12);
  g.drawLine(MW-25*5,MH,MW-25*5,MH-5);

  g.drawLine(MW,60,MW,HEIGHT-40); //y below 30=1CM
  g.drawLine(MW,60,MW-5,60+5);
g.drawLine(MW,60,MW+5,60+5);
  g.drawString("y",MW-10,65);
  g.drawString("5",MW-10,MH-30*5);
  g.drawLine(MW,MH-30*5,MW+5,MH-30*5);
  g.drawString("-5",MW-12,MH+30*5);
  g.drawLine(MW,MH+30*5,MW+5,MH+30*5);
  g.drawString("10",MW-15,MH-30*10);
  g.drawLine(MW,MH-30*10,MW+5,MH-30*10);
  g.drawString("-10",MW-18,MH+30*10);
  g.drawLine(MW,MH+30*10,MW+5,MH+30*10);

//========= asume a=1 draw the line ============
  for (int count=0;count<=25*10;)
{ g.setColor(Color.red);
    int temp;
    x=-5+((double)count/(double)25);
    temp=count;
   x1=-5+((double)++count/(double)25);
    g.drawLine(-25*5+temp+MW,(int)(MH-30*f(a)),-25*5+count+MW,(int)(MH-30*f1(a)));
//========= draw the line coped with ==============
if(ttwo.getText().length()!=0) {
      g.setColor(Color.blue);
      g.drawLine(-25*5+temp+MW,(int)(MH-30*l()),-25*5+count+MW,(int)(MH-30*ltwo()));
   }
  }
//========= description ==========================
Font font=new Font("隶书",Font.BOLD,24);
    g.setFont(font);
g.setColor(Color.red);
    g.drawString("Red : 原函数",50,100);
    g.setColor(Color.blue);
    g.drawString("Blue : 拟合函数",50,120);
//========= draw the line coped with ==============
/* g.setColor(new Color(0x00,0x99,0x00));
  if(ttwo.getText().length()!=0) {
   for (int count=0;count<=25*10 ; )
   {
    int temp;
    x=-5+((double)count/(double)25);
    temp=count;
   x1=-5+((double)++count/(double)25);
    g.drawLine(-25*5+temp+MW,(int)l(a),-25*5+count+MW,(int)ltwo(a));
   }
  }
else { } */
}
//======= draw lintening ==================
class DrawListener implements ActionListener
{
  public void actionPerformed(ActionEvent e)
  {
    double one;
    int two;
    if(tone.getText().length()==0&&ttwo.getText().length()==0) {JOptionPane.showMessageDialog(null,"please input aviliable number");}
   if(tone.getText().length()!=0) {one=Double.parseDouble(tone.getText());a=one;}
    if(ttwo.getText().length()!=0) {two=Integer.parseInt(ttwo.getText()); n=two;}
    System.out.println("a="+tone.getText());
    content.repaint();
    repaint();
    //content.setBackground(new Color(0x71,0xA6,0xF4));
  }
}

//======= draw ======================
  public static void main(String[] args)
  {
    Main get=new Main();
    get.setTitle("demo version1.0 (made by Infinite)");
    get.setVisible(true);
  }
}

4.Re:Applet中怎样在初始化的时候显示按钮？？？ [Re: zc_218]	Copy to clipboard
Posted by: Infinite Posted on: 2005-12-06 13:18

5.Re:Applet中怎样在初始化的时候显示按钮？？？ [Re: zc_218]	Copy to clipboard
Posted by: shibin20011983 Posted on: 2005-12-06 20:43 对呀，我编applet和frame的时候都这样的，运行的时候看不见按钮，只要动一下界面就可以出来了，这是为什么？

6.Re:Applet中怎样在初始化的时候显示按钮？？？ [Re: zc_218]	Copy to clipboard
Posted by: 缥缈水云间 Posted on: 2006-01-09 20:42 上次我也遇到类似的情况,后来解决了,可现在想不起来了哦.等想起来再告诉你吧.