Write a program that will make a copy of a text file, line by line. Read the name of the existing file and the name of the new file—the copy—from the keyboard. Use the methods of the class File to test whether the original file exists and can be read. If not, display an error message and abort the program. Similarly, see whether the name of the new file already exists. If so, display a warning message and allow the user to either abort the program, overwrite the existing file, or enter a new name for the file.