import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class ValidationCode extends JFrame implements ActionListener{
private JButton productBtn;
private JPanel downPanel;
public ValidationCode(){
productBtn=new JButton("New Code");
productBtn.addActionListener(this);
productBtn.setSize(50,50);
downPanel=new JPanel();
downPanel.add(productBtn);
this.setTitle("Validation Code");
this.add(downPanel);
}
public void actionPerformed(ActionEvent e){
this.repaint();
}
public void paint(Graphics g){
super.paint(g);
String code="";
char[] characters={'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','1','2','3','4','5','6','7','8','9','0'};
char[] fourResult=new char[4];
int index;
for (int k=0;k<4;k++ ){
index=(int)(Math.random()*62);
fourResult[k]=characters[index];
}
for(int i=0;i<4;i++)
code+=fourResult[i];
g.setColor(Color.RED);
g.drawString(code,100,100);
}
public static void main(String[] args){
ValidationCode vc=new ValidationCode();
vc.setBounds(300,300,200,200);
vc.setVisible(true);
vc.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
运行结果：
posted on 2009-11-02 18:30
期待明天 阅读(435)
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Java