The questions are all connected from the top bottom but only the code for Java programs is all I need. as per your request, I remove already other questions

4. Write a Java program for a Temperature Converter with the following specifications a. The program should display a menu as follows: TEMPERATURE CONVERTER MAIN MENU [1] Conversion from Celsius to Fahrenheit [2] Conversion from Fahrenheit to Celsius [3] Exit Choose an option b. Option 1 should ask for a temperature input and convert it to Fahrenheit. Display the converted temperature. Assume that the user will only input numerical value. c. Option 2 should ask for a temperature input and convert it to Celsius. Display the converted temperature. Assume that the user will only input numerical value. d. The program returns to the main menu after each display from the option, and when an invalid input of the option is encountered. Validate the option input. Only 1,2 and 3 are acceptable, otherwise, display a message error and return to the main menu e. f. Exit option terminates the program