Java sample code

This code is used in the validation of the the date text field on the fields loss of focus.  Rather than using a message box, the section of the date that is generating the error, is highlighted.  Further validation is carried out prior to sending the date to the database.  The second validation occurs when the getDate() method is called.

private boolean validation() throws Exception {
   
    String date = this.getText();
//Check to see if a date has been entered
    if (!(date.equals(new String("DD-MM-YYYY")))){
    int day = Integer.parseInt(date.substring(0,2));
    int month = Integer.parseInt(date.substring(3,5));
    int year =Integer.parseInt(date.substring(6,8));
//Used to check if the entered year is a leap year
    java.util.GregorianCalendar leapYear = new java.util.GregorianCalendar();
   

   //System.out.println(day);
    //System.out.println(month);
    //System.out.println(this.getText().length());
   
//Check weather a complete date has been entered
    if (this.getText().length() != 10){
       
        this.selectAll();
        this.setSelectedTextColor(java.awt.Color.red);
        return false;

    }

//Check weather a valid # months has been entered
    if (month >12){

        this.select(3,5);
//Highlight month
        this.setSelectedTextColor(java.awt.Color.red);
        return false;
           
    }//end if

//Check weather a valid # days has been entered for a given month
    switch (month){

        case 1: case 3: case 5: case 7: case 8: case 10: case 12:

        if (day > 31){

        this.select(0,2);
        this.setSelectedTextColor(java.awt.Color.red);
        return false;
           
        }
        break;

        case 2:

        if(leapYear.isLeapYear(year)){

            if(day > 29){

        this.select(0,2);
        this.setSelectedTextColor(java.awt.Color.red);
        return false;
           
            }//end inner if
           
            else if(day > 28){

        this.select(0,2);
        this.setSelectedTextColor(java.awt.Color.red);
        return false;
           
            }//end else
           
        }//end outer if
        break;

        default:

        if (day >30){

        this.select(0,2);
        this.setSelectedTextColor(java.awt.Color.red);
        return false;
           
        }//end if

    }//end switch

    }//end text(DD-MM-YYYY) if

    return true;
}