This program converts a 6-digit numeric passcode into an English word (a=1, b=2, etc) so that it would be easier to memorize. Regular expression is used twice in this program, to check whether the input string contains digits (0-9) only and to extract the words from the content of the text file
(words.txt).
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159 | import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import java.util.regex.*;
import javax.swing.*;
public class PasswordMemorizer extends JFrame{
private JTextField tfpass=null;
private JPanel panel=null;
private JLabel lsuggest=null;
private JButton bgenerate=null;
public PasswordMemorizer(){
super("Password Memorizer");
setSize(300,120);
tfpass=new JTextField();
tfpass.setColumns(15);
panel=new JPanel();
lsuggest=new JLabel();
bgenerate=new JButton("Generate");
bgenerate.addActionListener(new ButtonHandler());
setLayout(new BorderLayout());
add("North",tfpass);
panel.add(lsuggest);
add("Center",panel);
add("South",bgenerate);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
class ButtonHandler implements ActionListener{
public void actionPerformed(ActionEvent e){
String pwd=tfpass.getText();
if(pwd.length()!=6){
return;
}
Pattern pattern=Pattern.compile("\\d{6}");
Matcher matcher=pattern.matcher(pwd);
boolean found=false;
while(matcher.find()){
found=true;
}
if(!found){
return;
}
try{
Scanner sc=new Scanner(new FileInputStream("words.txt"));
StringBuffer sbuf=new StringBuffer();
sbuf.append(sc.nextLine());
String regex=" ";
Pattern p=Pattern.compile(regex);
String[] items=p.split(sbuf);
for(int i=0;i<items.length;i++){
String item="";
for(int j=0;j<items[i].length();j++){
String num=items[i].charAt(j)+"";
switch(num){
case "a":
num="1";
break;
case "b":
num="2";
break;
case "c":
num="3";
break;
case "d":
num="4";
break;
case "e":
num="5";
break;
case "f":
num="6";
break;
case "g":
num="7";
break;
case "h":
num="8";
break;
case "i":
num="9";
break;
case "j":
num="10";
break;
case "k":
num="11";
break;
case "l":
num="12";
break;
case "m":
num="13";
break;
case "n":
num="14";
break;
case "o":
num="15";
break;
case "p":
num="16";
break;
case "q":
num="17";
break;
case "r":
num="18";
break;
case "s":
num="19";
break;
case "t":
num="20";
break;
case "u":
num="21";
break;
case "v":
num="22";
break;
case "w":
num="23";
break;
case "x":
num="24";
break;
case "y":
num="25";
break;
case "z":
num="26";
break;
}
item=item+num;
}
if(pwd.equals(item)){
lsuggest.setLocation(panel.getWidth()/2,panel.getHeight()/2);
lsuggest.setText(items[i]);
}
item="";
}
}catch(Exception ex){
}
}
}
public static void main(String[] args){
new PasswordMemorizer();
}
}
|
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