Logic error in a class I wrote...help

Question

I wrote this class to filter a simplified version of Military time; basically it
returns a true or false statement to whether a specified string contains
the appropriate character sequence. My problem is that it seems to
report false even if my time format is correct.
example:
correct time: "0700"
incorrect time: "700" or invlalid characters "asdf "
maybe you all could catch me logic error...my head is bust
class SimpleMilitaryTime
     //Verify that their are only 4 characters in the string
     public boolean verifyLength(String time)
          int textFieldLength;
          boolean flag = true;
          textFieldLength = time.length();
          if (textFieldLength == 4)
               flag = true;
          else
               flag = false;
          return flag;
     }//end verify length
     //Method for comparing characters that can be used
     public boolean verifyNumerals( String time )
          boolean flag = true;
          int flagCounter = 0;
          char theChar;
//testing characters to see if they match or dont
//match the below lists of char numerals
//If they don't, the flagcounter is increased by 
//one and the flag is returned as false
//because the flagcounter is greater than 0 
//indicating that they are not all numerals but
//some other sort of character
          for (int i = 0; i <= time.length(); i++)
                 theChar = (char)time.indexOf(i);
               switch (theChar)
                    case '0':
                         break;
                    case '1':
                         break;
                    case '2':
                         break;
                    case '3':
                         break;
                    case '4':
                         break;
                    case '5':
                         break;
                    case '6':
                         break;
                    case '7':
                         break;
                    case '8':
                         break;
                    case '9':
                         break;
                    default:
                          flagCounter = flagCounter + 1;
               }//end of switch
          }//end of for loop
          if (flagCounter < 0 )
               flag = true;
          else
               flag = false;
          return flag;
     }//End of Method
     //Method to determine numeral format
     public boolean verifyFormat( String time )
          boolean flag = true;
          boolean hrFlag = true;
          boolean minFlag = true;
          String hr, min;
          hr = time.substring(0, 1);
          min = time.substring(2, 3);
          hrFlag = verifyHrRange( hr );
          //return true if its in the hour range of 0 to 23
          minFlag = verifyMinRange( min );     
                                          //return true if its in the minutes range of 0 to 59
          //If hrFlag or minFlag is false then format does
                                           //not meet the Military Time Format
          if (hrFlag == false || minFlag == false)
               flag = false;
          else
               flag = true;
     return flag;
     }//end of Method
     //Verify the Range of Hr  between 0 and 23
     public boolean verifyHrRange( String hr )
          int hrTime;
          boolean flag = true;
          hrTime = Integer.parseInt( hr );
          if ( hrTime >= 0 && hrTime <= 23 )
               flag = true;
          else
               flag = false;
     return flag;
     }//End of Method
     //Verify the Range of Minutes  between 0 and 59
     public boolean verifyMinRange( String min )
          int minTime;
          boolean flag = true;
          minTime = Integer.parseInt( min );
          if ( minTime >= 0 && minTime <= 59 )
               flag = true;
          else
               flag = false;
     return flag;
     }//End of Method
     //Method validates total time content
     public boolean validateTime( String time )
          boolean flag = true;
          boolean flagLength = true;
          boolean flagNumerals = true;          
          boolean flagFormat = true;          
          flagLength = verifyLength( time );                         //Is the length  == to 4 characters long
          if( flagLength == true )
               flagNumerals = verifyNumerals( time );               //Is the content made up of numerals
               if( flagNumerals == true )
                    flagFormat = verifyFormat( time );               //Is the format within MilitaryTime Specs
                    if( flagFormat == true )
                         flag = true;
                    else
                         flag = false;                                             //IF one or all are FALSE then FLAG is set to false
               else
                    flag = false;
          else
               flag = false;
          //return status of test run
          return flag;               
     }//End of Method
}//End of Class

Answer 1

Interestingly enough, although both examples simplify the logic, I still
recieve a "false" when testing it. Here is some more code that I use
when a text field has lost focus. Right now the code is set to just test
the input.
The field is inialized to "1234". Once the field gains focus, it immediately sets to "false"...not sure why.?.? Even after resetting field
to another 4 digit numeral sequence I still get a "false" return instead of
verifying it as "true. " any ideas?
here is the code for testing the MilitaryTime class:
private class TextFieldListener extends FocusAdapter
     //method that listens losing focus of textfield
     public void focusLost( FocusEvent ev )
          boolean flag;
          String indFALSE, indTRUE;
          indFALSE = "FALSE";
          indTRUE = "TRUE";
          int strLength;
          flag = mt.isValidTime(sunMornStartTime_str); //mt is for MilitaryTime
          if (flag == false)
          sunMornStartTime.setText(new String(indFALSE));
          if (flag == true)
          sunMornStartTime.setText(new String(indTRUE));
     }//End of Method
}//End of private class TextFieldAction