What is the output of this program? (or, can it be compiled)?

(i)Java AWT (Abstract Window Toolkit) is an API to develop GUI or window-based applications in java.
Java AWT components are platform-dependent i.e. components are displayed according to the view of operating system. AWT is heavyweight i.e. its components are using the resources of OS.
The java.awt package provides classes for AWT API such as Text Field, Label, Text Area, Radio Button, Checkbox, Choice, List etc.
(ii) Java Swing is used to create window-based applications. It is built on the top of AWT (Abstract Windowing Toolkit) API and entirely written in java.

Unlike AWT, Java Swing provides platform-independent and lightweight components.

The javax.swing package provides classes for java swing API such as JButton, JTextField, JTextArea, JRadioButton, JCheckbox, JMenu, JColorChooser etc.


(iii) Java FX: JavaFX is a Java library that is used to develop Desktop applications as well as Rich Internet Applications (RIA). The applications built in JavaFX, can run on multiple platforms including Web, Mobile and Desktops. JavaFX is intended to replace swing in Java applications as a GUI framework. However, It provides more functionalities than swing. Like Swing, JavaFX also provides its own components and doesn't depend upon the operating system. It is lightweight and hardware accelerated. It supports various operating systems including Windows, Linux and Mac OS.

17. 
    Complete this Fibonacci code.
    

public class Fibonacci{ public static void main(String[] args) { for (int i = 0; i < 5; i++) { int result = fiboRekursif(i); System.out.print(result + " "); } } public static Integer fiboRekursif(int n) { …………. return ……….; } } Ans: The complete code is shown below:

18. 
    Explain input and output file in Java and how to handle it!
    

Ans:

• 
  Java I/O stream is the flow of data that you can either read from, or you can write to.
  

It is used to perform read and write operations in file permanently. Java uses streams to perform these tasks. Java I/O stream is also called File Handling, or File I/O. It is available in java.io package.

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  Java.io package provides classes for system input and output through files, network streams, memory buffers, etc.
  
• 
  Some input-output stream will be initialized automatically by the JVM and these streams are available in System class as in, out, and err variable.
  

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