Problem on after command javac

Dear Sir/Madam.
Can anyone help to solve the following problems ? I'm Java Beginner and I'll try to write this program using
InputBox and Output Box. Thanks a lot !!
/* celsius
Programming with java by Wong
A program to input temperature in Celsius and prints out the temperature in Fabrenheit
Input: celsius
compute: fabrenheit
class celsius
public static void main (String[]args)
mainWindow = new Mainwindow ("celsius");
inputBox = new InputBox(mainWindow);
outputBox = new OutputBox(mainWindow);
mainWindow.setVisible(true);
outputBox.setVisible(true);
float celsius;
double fabrenheit;
//get input
celsius = inputBox.getfloat("celsius:");
//echo print the input values
outputBox.printLine("Enter celsius:");
//compute fabrenheit
fabrenheit=1.8*celsius+32;
outputBox.printLine("fabrenheit is :");

0) What actually is the problem?
1) What are InputBox and OutputBox? Classes of your own?
2) Isn't it spelled Fahrenheit?

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Please remember to mark the replies as answers if they help and unmark them if they provide no help.

Problem on after command javac

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