Allez

public class LoginInfo
{
    //******  instance data ******/
    private String loginID = "";        // Last_First name
    private String password;            // default is 3 random characters A-Z

    //******  Constructor   ******/
    /** Constructor, sets loginID to parameter (change format!)
     *          sets password to a random String of 3 characters
     * Precondition: parameter is not null, or of the form "first last" or ""
     *          if parameter is empty string assign empty string to loginID
     */
    public LoginInfo(String id){
        if (id.equals("")){loginID = "";}
        loginID = id;
        password = genDefaultPassword();
    }

    //******  accessor methods  ******/

    /** getLoginID
     * @return loginID (String)
     */
    public String getLoginID(){
        return loginID;
    }

    /** getPassword
     * @return password (String)
     */
    public String getPassword(){
        return password;
    }

    //*******   modifier methods    ******/
    /** setLoginID -- sets the loginID field to "Lastname_Firstname"
     * Precondition: parameter is not null, or of the form "first last" or ""
     * @param String sets the loginID field to "Last_First" or "" if n is ""
     */
    public void setLoginID(String id){
        loginID = id;
        if (id.equals("")){loginID = "";}
    }

    /** setPassword
     * @param the new password (String)
     */
    public void setPassword(String p){
        password = p;
    }


    //*******   return methods  ******/
    /** getInitials -- Extracts initials from loginID
     * @return 2 characters, the first character of the first name
     *          + first character of last name (String)
     */
    public String getInitials(){
        return ("" + loginID.charAt((loginID.indexOf("_")+1)) + loginID.charAt(0)).toUpperCase();
    }


    /** getDisplayName -- Extracts first and last name from loginID,
     *      returns "First Last", make sure the first char of each are
     *      capitalized
     * @return "Firstname Lastname" (String)
     */
    public String getDisplayName(){
        String q = loginID.toUpperCase();
        return "" + q.substring((q.indexOf("_")+1)) + " " + q.substring(0,q.indexOf("_"));
    }

    public String genDefaultPassword(){
        String p = "";
        for(int i=0; i<3; i++){
            p.concat("" + ((int) (Math.random() * 26) + 65));
        }
        return p;
    }

    /** toString
     * @return data (String) -- see Lab sheet for example
     */
    public String toString(){
        return getDisplayName() + " (" + getInitials() + ") Login ID: " + getLoginID() + ", Password: " + getPassword();
    }

}