Apply Java FX and exception handling to design a Circle App class using properJava FX GUI components, such as labels, text fields and buttons (Submit, Clear, and Exit) to compute the area of circle and display the radius user entered in the text field and computing result in a proper location in the application window. It will also verify invalid data entries for radius (No letters and must be a positive real number) using exception handling. Your code will also have a custom-designed exception class named Negative Double Exception to handle the negative data exception. Your validation infomay be displayed in the application window or use output method of J Option Paneto prompt user for the correct data entry. Use loop to allow user to reenter a radius if it isinvalid until a correct data is entered. 1. Run and test your code to meet the requirements (you don’t need worry about the separation). Your validation code will continue to run until the valid data is entered.  Must use meaningful names for fields, variables, methods and classes.
2. Must use GUI components (Label, TextField, 3 Buttons). You may use any layout manager in your code.
3. Must document each of your source code (see example in the next slide)

What is the algorithm for building a binary tree program

Laire writes a letter to her grandmother, in which she describes an amusement park she visited last week. she adds pictures of that place in her letter. which feature of a word processing program will claire to remove unwanted parts of the pictures?

This question involves a class named textfile that represents a text file. public class textfile { private string filename; private string filename; private arraylist words; // constructors not shown // postcondition: returns the number of bytes in this file public int filesize() { } // precondition: 0 < = index < words.size() // postcondition: removes numwords words from the words arraylist beginning at // index. public void deletewords(int index, int numwords) { } // precondition: 0 < = index < = words.size() // postcondition: adds elements from newwords array to words arraylist beginning // at index. pub lic voidaddwords(int index, string[] newwords) { } // other methods not shown } complete the filesize() method. the filesize() is computed in bytes. in a text file, each character in each word counts as one byte. in addition, there is a space in between each word in the words arraylist, and each of those spaces also counts as one byte. for example, suppose the words arraylist stores the following words: { mary had a little lamb; its fleece was white as snow. } the filesize() method would compute 4 + 3 + 1 + 6 + 5 + 4 + 6 + 3 + 5 + 2 + 5 as the sum of the lengths of each string in the arraylist. the value returned would be this sum plus 10, because there would also be 10 spaces in between the 11 words. complete the filesize() method below: // postcondition: returns the number of bytes in this file public int filesize() { }