Object-Oriented Programming Java. The 6th Week of Class Notes.

Tfd7.setBackground(Color.RED);

程式設計工藝大師

// app17_8, Button類別
import java.awt.*;
import java.awt.event.*;
public class app17_8 extends Frame implements ActionListener
{
   //static Frame frm=new Frame("Button class");
   static Button btn1=new Button("Button1");   // 建立按鈕物件
   static Button btn2=new Button("Button2");   
   static Button btn3=new Button("Button3");   
   static Button btn4=new Button("Button4");   
   static Button btn5=new Button("Button5");   
   static BorderLayout border=new BorderLayout();//環繞排列
   static TextField Tfd=new TextField();
     
   public static void main(String args[])
   {
     app17_8  frm=new app17_8();
      frm.setSize(200,200);
      btn1.addActionListener(frm);

      frm.add(btn1,border.WEST);                             // 在視窗內加入按鈕
      frm.add(btn2,border.EAST);
      frm.add(btn3,border.NORTH);                             
      frm.add(btn4,border.SOUTH);                             
      //frm.add(btn5,border.CENTER);
      frm.add(Tfd,border.CENTER);                                                                                                                    
      //frm.setLayout(new FlowLayout());
      frm.setVisible(true);     
      frm.addWindowListener(new java.awt.event.WindowAdapter() { 
public void windowClosing(java.awt.event.WindowEvent e) { 
System.exit(0); 
} 
});
   }
public void actionPerformed(ActionEvent e) 
{ 
int rn;
rn=(int) (Math.random()*49) ; 
System.out.println(rn );
}

}

執行結果

// app17_8, Button類別
import java.awt.*;
import java.awt.event.*;
public class app17_8 extends Frame implements ActionListener
{
   //static Frame frm=new Frame("Button class");
   static Button btn1=new Button("樂透產生器");   // 建立按鈕物件
   static Button btn2=new Button("Button2");   
   static Button btn3=new Button("Button3");   
   static Button btn4=new Button("Button4");   
   static Button btn5=new Button("Button5");   
   //static BorderLayout border=new BorderLayout();//環繞排列
   static TextField Tfd1=new TextField();
   static TextField Tfd2=new TextField();
   static TextField Tfd3=new TextField();
   static TextField Tfd4=new TextField();
   static TextField Tfd5=new TextField();
   static TextField Tfd6=new TextField();
   static TextField Tfd7=new TextField();


     
   public static void main(String args[])
   {
     app17_8  frm=new app17_8();
      frm.setSize(200,200);
      btn1.addActionListener(frm);
      frm.add(btn1);
      frm.add(Tfd1);
      frm.add(Tfd2);
      frm.add(Tfd3);
      frm.add(Tfd4);
      frm.add(Tfd5);
      frm.add(Tfd6);
      frm.add(Tfd7);
      //frm.add(btn1,border.WEST);                             // 在視窗內加入按鈕
      //frm.add(btn2,border.EAST);
      //frm.add(btn3,border.NORTH);                             
      //frm.add(btn4,border.SOUTH);                             
      //frm.add(btn5,border.CENTER);
      //frm.add(Tfd,border.CENTER);                                                                                                                    
      frm.setLayout(new FlowLayout());
      frm.setVisible(true);     
      frm.addWindowListener(new java.awt.event.WindowAdapter() { 
public void windowClosing(java.awt.event.WindowEvent e) { 
System.exit(0); 
} 
});
   }
public void actionPerformed(ActionEvent e) 
{ 
int t1,t2,t3,t4,t5,t6,t7;
t1=(int)(Math.random()*49+1);
t2=(int)(Math.random()*49+1);
t3=(int)(Math.random()*49+1);
t4=(int)(Math.random()*49+1);
t5=(int)(Math.random()*49+1);
t6=(int)(Math.random()*49+1);
t7=(int)(Math.random()*49+1);
String string1= Integer.toString(t1);
String string2 = Integer.toString(t2);
String string3 = Integer.toString(t3);
String string4 = Integer.toString(t4);
String string5 = Integer.toString(t5);
String string6 = Integer.toString(t6);
String string7 = Integer.toString(t7);
Tfd1.setText(string1);
Tfd2.setText(string2);
Tfd3.setText(string3);
Tfd4.setText(string4);
Tfd5.setText(string5);
Tfd6.setText(string6);
Tfd7.setText(string7);
}

}