Can someone help me add methods into my code?

[John Sing]

So I had to write a code to encrypt a password the user inputs which I was able to do. But now I have to add methods and make a driver class which I am terrible at. Whenever I try to the file with all the code can't pick up the variables I set in the driver class and it becomes a giant disaster. So can someone give me the basics on how to add a method and a driver class into a code? Every part of the code that has // has to be its own method. Here is the code I am trying to add methods into

import javax.swing.JOptionPane;
public class passwordTest
{
  public static void main( String[] args )
  {
 String password;
  password = JOptionPane.showInputDialog("Please input your password");
 //converting to upcase 
    password = password.trim();
    password = (password.toUpperCase());
      
    
  // changing stuff
    password = password.replace ( "A" , "@");
    password = password.replace ( "E" , "=");
    password = password.replace ( "I" , "!");
    password = password.replace ( "J" , "?");
    password = password.replace ( "O" , "*");
    password = password.replace ( "P" , "#");
    password = password.replace ( "R" , "&");
    password = password.replace ( "S" , "$");
    password = password.replace ( "T" , "+");
    password = password.replace ( "V" , "^");
    password = password.replace ( "X" , "%");
    password = password.replace ( " " , "_");
    
    int length = password.length();
     //Switching halfs
     String FirstHalf = password.substring(0, length/2);
     String SecondHalf = password.substring(length/2, length);
     password = SecondHalf + FirstHalf;
     
//Switching first and last letter
      String firstChar = password.substring(0,1);
      String lastChar = password.substring(length - 1);
      password = lastChar + password.substring(1, length-1) + firstChar;
      
      //swapMiddleChars
     int lengthUse = length/2;
    
    String firstPart = password.substring(lengthUse-2, lengthUse);
    String secondPart = password.substring(lengthUse, lengthUse+2); 
    String beginingOfAlphabet = password.substring(0, lengthUse-2);
    String endOfAlphabet = password.substring(lengthUse+2,length);
    
   password = beginingOfAlphabet + secondPart + firstPart + endOfAlphabet;
      
   
    JOptionPane.showMessageDialog(null,password);
}
}

Sorry for asking such an open ended question but I have no idea where to even begin.

[Tushar Goel]

still unable to understand your problem.. Can you please elaborate?

[Knute Snortum]

If I'm understanding correctly, you want to do something like this:

public static void main( String[] args )
{
    String password;
    password = JOptionPane.showInputDialog("Please input your password");
    password = upcase(password);
   
    // other stuff
}

 //converting to upcase
private String upcase(String password) 
{
    password = password.trim();
    password = (password.toUpperCase());

    return password;
}

[John Sing]

Knute Snortum wrote:If I'm understanding correctly, you want to do something like this:

public static void main( String[] args )
{
    String password;
    password = JOptionPane.showInputDialog("Please input your password");
    password = upcase(password);
   
    // other stuff
}

 //converting to upcase
private String upcase(String password) 
{
    password = password.trim();
    password = (password.toUpperCase());

    return password;
}

Exactly but whenever I try something like that I get errors so I assumed I was doing it wrong. Here is the part of my new code with the method I tried to put in.

import javax.swing.JOptionPane;
public class passwordTest4
{
  public static void main( String[] args )
  {
 String password;
  password = JOptionPane.showInputDialog("Please input your password");
  
  
 //converting to upcase
  private String upcase(String password) 
  {
    password = password.trim();
    password = (password.toUpperCase());
    return password;
  }

and here are the errors I get

[line: 11]
Error: illegal start of expression
[line: 11]
Error: ';' expected
[line: 11]
Error: ';' expected

So what should I do to fix these errors?

[Liutauras Vilda]

John Sing wrote:So what should I do to fix these errors?

There are few things.

1st - you cannot declare method within method, so you have to close your main method, then declare another.
2nd - you cannot call non static method in static method.

This sort of example could help you only for a quick little practise programs. For better practises search for faq "Main Is A Pain".

Example to solve 1st and 2nd mentioned points.

public class Test {

    public static void main(String[] args) {
        // little code
           ...
    } // end of main method

    private static String upcase(String password) {
        // code
           ...
    } // end of upcase method

} // end of class