PasswordCheckProgram source code:
import
java.awt.*;
import
java.awt.event.*;
class Login extends Frame implements TextListener{
Panel panel;
Label lblpassword;
Label lblmess;
TextField txtpassword;
Login(){
1 setSize(600,150);
2 setResizable(false);
3 setTitle("Password
Check Program");
4 lblpassword=new
Label("Password:");
5 lblmess=new Label("A
strong password must contain digits, \nlower and upper letters, symbols,and
eight characters long.");
6 txtpassword=new
TextField(20);
7 txtpassword.setEchoChar('*');
8 txtpassword.addTextListener(this);
9 panel=new Panel();
10 panel.add(lblpassword);
11 panel.add(txtpassword);
12 panel.add(lblmess);
13 panel.setLayout(new
FlowLayout());
14 add(panel,
BorderLayout.CENTER);
15 addWindowListener(new
WindowAdapter(){
public void
windowClosing(WindowEvent e){
System.exit(0);
}
});
16 setLocationRelativeTo(null);
17 setVisible(true);
18 txtpassword.requestFocus();
}
19 public
void textValueChanged(TextEvent e){
String
mess=checkStrength(txtpassword.getText().toCharArray());
showMess(mess,lblpassword);
}
20 public
void showMess(String mess, Label lbl){
lbl.setText(mess);
lbl.setForeground(Color.RED);
}
21 public
String checkStrength(char[] passw){
String mess=null;
if(containsLowercase(passw)
&& containsUppercase(passw) && containsDigit(passw) &&
containsSymbol(passw)
){
if(passw.length>=8)
mess="Strong";
else
mess="Medium";
}
else
mess="Weak";
return mess;
}
22 public
boolean containsLowercase(char [] passw){
boolean hasLower=false;
for(char c:passw){
if(Character.isLowerCase(c))
{
hasLower=true;
break;
}
}
return hasLower;
}
23 public
boolean containsUppercase(char [] passw){
boolean hasUpper=false;
for(char c:passw){
if(Character.isUpperCase(c))
{
hasUpper=true;
break;
}
}
return hasUpper;
}
24 public
boolean containsDigit(char [] passw){
boolean hasDigit=false;
for(char c:passw){
if(Character.isDigit(c))
{
hasDigit=true;
break;
}
}
return hasDigit;
}
25 public
boolean containsSymbol(char [] passw){
char[]
symbols={'!','@','#','$','%','^','&','*','(',')','_','-','+','=','{','}',’[’,’]’};
String passwText=new
String(passw);
boolean hasSymbol=false;
for(char c:symbols){
if(passwText.indexOf(c)!=-1)
{
hasSymbol=true;
break;
}
}
return hasSymbol;
}
}
26 public
class PasswordCheckProgram{
public static void main(String
args[]){
new
Login();
}
}
1 Specify the size of the program window.
2 Disable window resizing.
3 Set the title of the program (Password Check Program).
4 Create a Label lblpassword object to show "Password:" text when the program firstly loads.
5 Create a Label lblmess object to show red-color message (Strong, Medium, Weak).
6 Create a TextFeld txtpassword object to enable password input.
7 Specify the character to display on the password text box.
8 Register the password text box with the text event.
9-12 Create a Panel panel object and add all above objects in to it.
13 Specify the layout of controls to display.
14 Add panel object to the program window.
15 The program window can close when the its close button is clicked.
16 Display the program window at the center of the screen.
17 Make use the program window is visible.
18 Focus on the password box when the program loads.
19 The textValueChanged method is rewritten to enable the password box to perform action when its value changes. Its action is to check whether the input password is strong.
20 The showMess method display the text "Strong", "Weak", or "Medium" in red color. It makes change to the text displaying on the lblshow label.
21 The checkStrenght method invokes the containsLowercase, containsUppercase,containsDigit, and containsSymbol methods to determine whether password input is strong.
22 The containsLowercase method checks whether the password contains an lower case character. The isLowerCase( char c) method of the Character is used to perform this operation.
23 The containsUppercase method checks whether the password contains an upper case character. The isUpperCase( char c) method of the Character is used to perform this operation.
24 The containsDigit method checks whether the password contains a digit character. The isDigit( char c) method of the Character is used to perform this operation.
25 The containsSymbol method checks whether the password contains a symbol. The code starts by creating a list of symbols then the for loop is used to check whether any symbol in the list is found in the password text.
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