Question about try, catch

How do I make the code go back so that once user type more than 20
characters in the string, it will print a message and then continue to
process more strings?

Here is the code:

//StringTooLongExceptionDriver

import java.util.Scanner;
import java.io.*;

public class StringTooLongExceptionDriver
{
    //
    // The main method prompts and reads strings. If the string has more
    // than 20 characters, it throws a StringTooLongException exception.
    //
    public static void main(String[] args){
        //System.out.println("Enter a string: ");
        String strInput = "";
        int newStringCounter;
        int arrayCounter=0;
        char[] myCharArray = new char[20];

        InputStreamReader myRead = new InputStreamReader(System.in);
        BufferedReader in = new BufferedReader(myRead);

        try{
            while (!(strInput.equals("DONE"))){
                System.out.println("enter your string: ");
                int x = 0;
                strInput = in.readLine();
                newStringCounter = strInput.length();
                if (!(strInput.equals("DONE"))){
                    while (newStringCounter > 0){
                        myCharArray[arrayCounter] = strInput.charAt(x);
                        newStringCounter--;
                        System.out.print("the last char at array is " +
myCharArray[arrayCounter]);
                        System.out.println(" and array counter is " + arrayCounter);
                        x++;
                        arrayCounter++;
                    }
                }
            }
            if (strInput.equals("DONE")){
                System.out.print("you have enterd: ");
                    for (int i=0; i<=arrayCounter-1; i++){
                        System.out.print(myCharArray[i]);
                    }
                    System.out.println("");
                    System.out.println("End of the string you have enterd!");
                }
        }
        catch(Exception e){
        StringTooLongException error = new StringTooLongException("Total
string character now is larger than 20 characters");
        error.EndHere();
            }
    }
}
class StringTooLongException
{
    String statement = "";
    public StringTooLongException(String myError){
        statement = myError;
        System.out.println(statement);
    }
    public void EndHere(){
        System.out.println("please try again");
        System.exit(0);
    }
}