[java/fa] delete (#4967)

1 files changed, 0 insertions, 901 deletions

diff --git a/fa-ir/java-fa.html.markdown b/fa-ir/java-fa.html.markdown
deleted file mode 100644
index 6bc3a420..00000000
--- a/fa-ir/java-fa.html.markdown
+++ /dev/null
@@ -1,901 +0,0 @@
----
-language: java
-lang: fa-ir
-contributors:
-    - ["Jake Prather", "https://github.com/JakeHP"]
-    - ["Jakukyo Friel", "https://weakish.github.io"]
-    - ["Madison Dickson", "https://github.com/mix3d"]
-    - ["Simon Morgan", "https://sjm.io/"]
-    - ["Zachary Ferguson", "https://github.com/zfergus2"]
-    - ["Cameron Schermerhorn", "https://github.com/cschermerhorn"]
-    - ["Rachel Stiyer", "https://github.com/rstiyer"]
-    - ["Michael Dähnert", "https://github.com/JaXt0r"]
-    - ["Rob Rose", "https://github.com/RobRoseKnows"]
-    - ["Sean Nam", "https://github.com/seannam"]
-translators:
-    - ["ghaseminya", "https://github.com/ghaseminya"]
-filename: LearnJava-fa.java
----
-
-جاوا یک زبان برنامه نویسی کامپیوتری چند منظوره، با قابلیت همزمانی، برپایه کلاس و شی گرایی می باشد.
-[مطالعه بیشتر.](https://docs.oracle.com/javase/tutorial/java/)
-
-```java
-// Single-line comments start with //
-
-/*
-Multi-line comments look like this.
-*/
-
-/**
- * JavaDoc comments look like this. Used to describe the Class or various
- * attributes of a Class.
- * Main attributes:
- *
- * @author         @ghaseminya
- * @version     v1.0
-*/
-
-// Import ArrayList class inside of the java.util package
-import java.util.ArrayList;
-// Import all classes inside of java.security package
-import java.security.*;
-
-// Each .java file contains one outer-level public class, with the same name
-// as the file.
-public class LearnJava {
-
-    // In order to run a java program, it must have a main method as an entry 
-    // point.
-    public static void main (String[] args) {
-
-    ///////////////////////////////////////
-    // Input/Output
-    ///////////////////////////////////////
-
-        /*
-        * Output
-        */
-
-        // Use System.out.println() to print lines.
-        System.out.println("Hello World!");
-        System.out.println(
-            "Integer: " + 10 +
-            " Double: " + 3.14 +
-            " Boolean: " + true);
-
-        // To print without a newline, use System.out.print().
-        System.out.print("Hello ");
-        System.out.print("World");
-
-        // Use System.out.printf() for easy formatted printing.
-        System.out.printf("pi = %.5f", Math.PI); // => pi = 3.14159
-
-        /*
-         * Input
-         */
-
-        // use Scanner to read input
-        // must import java.util.Scanner;
-        Scanner scanner = new Scanner(System.in);
-
-        // read string input
-        String name = scanner.next();
-
-        // read byte input
-        byte numByte = scanner.nextByte();
-
-        // read int input
-        int numInt = scanner.nextInt();
-
-        // read long input
-        float numFloat - scanner.nextFloat();
-
-        // read double input
-        double numDouble = scanner.nextDouble();
-
-        // read boolean input
-        boolean bool = scanner.nextBoolean();
-
-        ///////////////////////////////////////
-        // Variables
-        ///////////////////////////////////////
-
-        /*
-        *  Variable Declaration
-        */
-        // Declare a variable using <type> <name>
-        int fooInt;
-        // Declare multiple variables of the same 
-        // type <type> <name1>, <name2>, <name3>
-        int fooInt1, fooInt2, fooInt3;
-
-        /*
-        *  Variable Initialization
-        */
-
-        // Initialize a variable using <type> <name> = <val>
-        int barInt = 1;
-        // Initialize multiple variables of same type with same 
-        // value <type> <name1>, <name2>, <name3> = <val>
-        int barInt1, barInt2, barInt3;
-        barInt1 = barInt2 = barInt3 = 1;
-
-        /*
-        *  Variable types
-        */
-        // Byte - 8-bit signed two's complement integer
-        // (-128 <= byte <= 127)
-        byte fooByte = 100;
-        
-        // If you would like to interpret a byte as an unsigned integer
-        // then this simple operation can help
-        int unsignedIntLessThan256 = 0xff & fooByte;
-        // this contrasts a cast which can be negative.
-        int signedInt = (int) fooByte;
-
-        // Short - 16-bit signed two's complement integer
-        // (-32,768 <= short <= 32,767)
-        short fooShort = 10000;
-
-        // Integer - 32-bit signed two's complement integer
-        // (-2,147,483,648 <= int <= 2,147,483,647)
-        int bazInt = 1;
-
-        // Long - 64-bit signed two's complement integer
-        // (-9,223,372,036,854,775,808 <= long <= 9,223,372,036,854,775,807)
-        long fooLong = 100000L;
-        // L is used to denote that this variable value is of type Long;
-        // anything without is treated as integer by default.
-
-        // Note: byte, short, int and long are signed. They can have positive and negative values.
-        // There are no unsigned variants.
-        // char, however, is 16-bit unsigned.
-
-        // Float - Single-precision 32-bit IEEE 754 Floating Point
-        // 2^-149 <= float <= (2-2^-23) * 2^127
-        float fooFloat = 234.5f;
-        // f or F is used to denote that this variable value is of type float;
-        // otherwise it is treated as double.
-
-        // Double - Double-precision 64-bit IEEE 754 Floating Point
-        // 2^-1074 <= x <= (2-2^-52) * 2^1023
-        double fooDouble = 123.4;
-
-        // Boolean - true & false
-        boolean fooBoolean = true;
-        boolean barBoolean = false;
-
-        // Char - A single 16-bit Unicode character
-        char fooChar = 'A';
-
-        // final variables can't be reassigned to another object,
-        final int HOURS_I_WORK_PER_WEEK = 9001;
-        // but they can be initialized later.
-        final double E;
-        E = 2.71828;
-
-        // BigInteger - Immutable arbitrary-precision integers
-        //
-        // BigInteger is a data type that allows programmers to manipulate
-        // integers longer than 64-bits. Integers are stored as an array of
-        // of bytes and are manipulated using functions built into BigInteger
-        //
-        // BigInteger can be initialized using an array of bytes or a string.        
-        BigInteger fooBigInteger = new BigInteger(fooByteArray);
-
-        // BigDecimal - Immutable, arbitrary-precision signed decimal number
-        //
-        // A BigDecimal takes two parts: an arbitrary precision integer 
-        // unscaled value and a 32-bit integer scale
-        //
-        // BigDecimal allows the programmer complete control over decimal
-        // rounding. It is recommended to use BigDecimal with currency values
-        // and where exact decimal precision is required.
-        //
-        // BigDecimal can be initialized with an int, long, double or String
-        // or by initializing the unscaled value (BigInteger) and scale (int).
-        BigDecimal fooBigDecimal = new BigDecimal(fooBigInteger, fooInt);
-        
-        // Be wary of the constructor that takes a float or double as
-        // the inaccuracy of the float/double will be copied in BigDecimal.
-        // Prefer the String constructor when you need an exact value.
-        BigDecimal tenCents = new BigDecimal("0.1");
-
-        // Strings
-        String fooString = "My String Is Here!";
-
-        // \n is an escaped character that starts a new line
-        String barString = "Printing on a new line?\nNo Problem!";
-        // \t is an escaped character that adds a tab character
-        String bazString = "Do you want to add a tab?\tNo Problem!";
-        System.out.println(fooString);
-        System.out.println(barString);
-        System.out.println(bazString);
-
-        // String Building
-        // #1 - with plus operator
-        // That's the basic way to do it (optimized under the hood)
-        String plusConcatenated = "Strings can " + "be concatenated " + "via + operator.";
-        System.out.println(plusConcatenated);
-        // Output: Strings can be concatenated via + operator.
-
-        // #2 - with StringBuilder
-        // This way doesn't create any intermediate strings. It just stores the string pieces, and ties them together
-        // when toString() is called.
-        // Hint: This class is not thread safe. A thread-safe alternative (with some impact on performance) is StringBuffer.
-        StringBuilder builderConcatenated = new StringBuilder();
-        builderConcatenated.append("You ");
-        builderConcatenated.append("can use ");
-        builderConcatenated.append("the StringBuilder class.");
-        System.out.println(builderConcatenated.toString()); // only now is the string built 
-        // Output: You can use the StringBuilder class.
-        
-        // StringBuilder is efficient when the fully constructed String is not required until the end of some processing.
-        StringBuilder stringBuilder = new StringBuilder();
-        String inefficientString = "";
-        for(int i = 0 ; i < 10; i++){
-            stringBuilder.append(i).append(" ");
-            inefficientString += i + " ";
-        }
-        System.out.println(inefficientString);
-        System.out.println(stringBuilder.toString());
-        // inefficientString requires a lot more work to produce, as it generates a String on every loop iteration.
-        // Simple concatenation with + is compiled to a StringBuilder and toString()
-        // Avoid string concatenation in loops.
-        
-        // #3 - with String formatter
-        // Another alternative way to create strings. Fast and readable.
-        String.format("%s may prefer %s.", "Or you", "String.format()");
-        // Output: Or you may prefer String.format().
- 
-        // Arrays
-        // The array size must be decided upon instantiation
-        // The following formats work for declaring an array
-        // <datatype>[] <var name> = new <datatype>[<array size>];
-        // <datatype> <var name>[] = new <datatype>[<array size>];
-        int[] intArray = new int[10];
-        String[] stringArray = new String[1];
-        boolean boolArray[] = new boolean[100];
-
-        // Another way to declare & initialize an array
-        int[] y = {9000, 1000, 1337};
-        String names[] = {"Bob", "John", "Fred", "Juan Pedro"};
-        boolean bools[] = {true, false, false};
-
-        // Indexing an array - Accessing an element
-        System.out.println("intArray @ 0: " + intArray[0]);
-
-        // Arrays are zero-indexed and mutable.
-        intArray[1] = 1;
-        System.out.println("intArray @ 1: " + intArray[1]); // => 1
-
-        // Other data types worth checking out
-        // ArrayLists - Like arrays except more functionality is offered, and
-        //              the size is mutable.
-        // LinkedLists - Implementation of doubly-linked list. All of the
-        //               operations perform as could be expected for a
-        //               doubly-linked list.
-        // Maps - A set of objects that map keys to values. Map is
-        //        an interface and therefore cannot be instantiated.
-        //        The type of keys and values contained in a Map must
-        //        be specified upon instantiation of the implementing
-        //        class. Each key may map to only one corresponding value,
-        //        and each key may appear only once (no duplicates).
-        // HashMaps - This class uses a hashtable to implement the Map
-        //            interface. This allows the execution time of basic
-        //            operations, such as get and insert element, to remain
-        //            constant even for large sets.
-        // TreeMap - This class is a sorted tree structure. It implements a red
-        //           black tree and sorts the entries based on the key value or
-        //           the comparator provided while creating the object
-
-        ///////////////////////////////////////
-        // Operators
-        ///////////////////////////////////////
-        System.out.println("\n->Operators");
-
-        int i1 = 1, i2 = 2; // Shorthand for multiple declarations
-
-        // Arithmetic is straightforward
-        System.out.println("1+2 = " + (i1 + i2)); // => 3
-        System.out.println("2-1 = " + (i2 - i1)); // => 1
-        System.out.println("2*1 = " + (i2 * i1)); // => 2
-        System.out.println("1/2 = " + (i1 / i2)); // => 0 (int/int returns int)
-        System.out.println("1/2 = " + (i1 / (double)i2)); // => 0.5
-
-        // Modulo
-        System.out.println("11%3 = "+(11 % 3)); // => 2
-
-        // Comparison operators
-        System.out.println("3 == 2? " + (3 == 2)); // => false
-        System.out.println("3 != 2? " + (3 != 2)); // => true
-        System.out.println("3 > 2? " + (3 > 2)); // => true
-        System.out.println("3 < 2? " + (3 < 2)); // => false
-        System.out.println("2 <= 2? " + (2 <= 2)); // => true
-        System.out.println("2 >= 2? " + (2 >= 2)); // => true
-
-        // Boolean operators
-        System.out.println("3 > 2 && 2 > 3? " + ((3 > 2) && (2 > 3))); // => false
-        System.out.println("3 > 2 || 2 > 3? " + ((3 > 2) || (2 > 3))); // => true
-        System.out.println("!(3 == 2)? " + (!(3 == 2))); // => true
-
-        // Bitwise operators!
-        /*
-        ~      Unary bitwise complement
-        <<     Signed left shift
-        >>     Signed/Arithmetic right shift
-        >>>    Unsigned/Logical right shift
-        &      Bitwise AND
-        ^      Bitwise exclusive OR
-        |      Bitwise inclusive OR
-        */
-
-        // Increment operators
-        int i = 0;
-        System.out.println("\n->Inc/Dec-rementation");
-        // The ++ and -- operators increment and decrement by 1 respectively.
-        // If they are placed before the variable, they increment then return;
-        // after the variable they return then increment.
-        System.out.println(i++); // i = 1, prints 0 (post-increment)
-        System.out.println(++i); // i = 2, prints 2 (pre-increment)
-        System.out.println(i--); // i = 1, prints 2 (post-decrement)
-        System.out.println(--i); // i = 0, prints 0 (pre-decrement)
-
-        ///////////////////////////////////////
-        // Control Structures
-        ///////////////////////////////////////
-        System.out.println("\n->Control Structures");
-
-        // If statements are c-like
-        int j = 10;
-        if (j == 10) {
-            System.out.println("I get printed");
-        } else if (j > 10) {
-            System.out.println("I don't");
-        } else {
-            System.out.println("I also don't");
-        }
-
-        // While loop
-        int fooWhile = 0;
-        while(fooWhile < 100) {
-            System.out.println(fooWhile);
-            // Increment the counter
-            // Iterated 100 times, fooWhile 0,1,2...99
-            fooWhile++;
-        }
-        System.out.println("fooWhile Value: " + fooWhile);
-
-        // Do While Loop
-        int fooDoWhile = 0;
-        do {
-            System.out.println(fooDoWhile);
-            // Increment the counter
-            // Iterated 99 times, fooDoWhile 0->99
-            fooDoWhile++;
-        } while(fooDoWhile < 100);
-        System.out.println("fooDoWhile Value: " + fooDoWhile);
-
-        // For Loop
-        // for loop structure => for(<start_statement>; <conditional>; <step>)
-        for (int fooFor = 0; fooFor < 10; fooFor++) {
-            System.out.println(fooFor);
-            // Iterated 10 times, fooFor 0->9
-        }
-        System.out.println("fooFor Value: " + fooFor);
-        
-        // Nested For Loop Exit with Label
-        outer:
-        for (int i = 0; i < 10; i++) {
-          for (int j = 0; j < 10; j++) {
-            if (i == 5 && j ==5) {
-              break outer;
-              // breaks out of outer loop instead of only the inner one
-            }
-          }
-        }
-        
-        // For Each Loop
-        // The for loop is also able to iterate over arrays as well as objects
-        // that implement the Iterable interface.
-        int[] fooList = {1, 2, 3, 4, 5, 6, 7, 8, 9};
-        // for each loop structure => for (<object> : <iterable>)
-        // reads as: for each element in the iterable
-        // note: the object type must match the element type of the iterable.
-        for (int bar : fooList) {
-            System.out.println(bar);
-            //Iterates 9 times and prints 1-9 on new lines
-        }
-
-        // Switch Case
-        // A switch works with the byte, short, char, and int data types.
-        // It also works with enumerated types (discussed in Enum Types), the
-        // String class, and a few special classes that wrap primitive types:
-        // Character, Byte, Short, and Integer.
-        int month = 3;
-        String monthString;
-        switch (month) {
-            case 1: monthString = "January";
-                    break;
-            case 2: monthString = "February";
-                    break;
-            case 3: monthString = "March";
-                    break;
-            default: monthString = "Some other month";
-                     break;
-        }
-        System.out.println("Switch Case Result: " + monthString);
-        
-        // Starting in Java 7 and above, switching Strings works like this:
-        String myAnswer = "maybe";
-        switch(myAnswer) {
-            case "yes":
-                System.out.println("You answered yes.");
-                break;
-            case "no":
-                System.out.println("You answered no.");
-                break;
-            case "maybe":
-                System.out.println("You answered maybe.");
-                break;
-            default:
-                System.out.println("You answered " + myAnswer);
-                break;
-        }
-        
-        
-        // Try-with-resources (Java 7+)
-        // Try-catch-finally statements work as expected in Java but in Java 7+
-        // the try-with-resources statement is also available. Try-with-resources
-        // simplifies try-catch-finally statements be closing resources
-        // automatically.
-        
-        // In order to use a try-with-resources, include a an instance of a class
-        // in the try statement. The class must implement java.lang.AutoCloseable.
-        try(BufferedReader br = new BufferedReader(new FileReader("foo.txt"))) {
-            // You can attempt to do something that could throw an exception.
-            System.out.println(br.readLine());
-            // In Java 7, the resource will always be closed, even if it throws
-            // an Exception. 
-        } catch (Exception ex) {
-            //The resource will be closed before the catch statement executes.
-            System.out.println("readLine() failed.");
-        }
-        // No need for a finally statement in this case, the BufferedReader is
-        // already closed. This can be used to avoid certain edge cases where
-        // a finally statement might not be called.
-        // To learn more:
-        // https://docs.oracle.com/javase/tutorial/essential/exceptions/tryResourceClose.html
-        
-        
-        // Conditional Shorthand
-        // You can use the '?' operator for quick assignments or logic forks.
-        // Reads as "If (statement) is true, use <first value>, otherwise, use
-        // <second value>"
-        int foo = 5;
-        String bar = (foo < 10) ? "A" : "B";
-        System.out.println(bar); // Prints A, because the statement is true
-
-        ////////////////////////////////////////
-        // Converting Data Types And Typecasting
-        ////////////////////////////////////////
-
-        // Converting data
-
-        // Convert String To Integer
-        Integer.parseInt("123");//returns an integer version of "123"
-
-        // Convert Integer To String
-        Integer.toString(123);//returns a string version of 123
-
-        // For other conversions check out the following classes:
-        // Double
-        // Long
-        // String
-
-        // Typecasting
-        // You can also cast Java objects, there's a lot of details and deals
-        // with some more intermediate concepts. Feel free to check it out here:
-        // https://docs.oracle.com/javase/tutorial/java/IandI/subclasses.html
-
-        ///////////////////////////////////////
-        // Classes And Functions
-        ///////////////////////////////////////
-
-        System.out.println("\n->Classes & Functions");
-
-        // (definition of the Bicycle class follows)
-
-        // Use new to instantiate a class
-        Bicycle trek = new Bicycle();
-
-        // Call object methods
-        trek.speedUp(3); // You should always use setter and getter methods
-        trek.setCadence(100);
-
-        // toString returns this Object's string representation.
-        System.out.println("trek info: " + trek.toString());
-
-        // Double Brace Initialization
-        // The Java Language has no syntax for how to create static Collections
-        // in an easy way. Usually you end up in the following way:
-        private static final Set<String> COUNTRIES = new HashSet<String>();
-        static {
-           COUNTRIES.add("DENMARK");
-           COUNTRIES.add("SWEDEN");
-           COUNTRIES.add("FINLAND");
-        }
-
-        // But there's a nifty way to achieve the same thing in an
-        // easier way, by using something that is called Double Brace
-        // Initialization.
-        private static final Set<String> COUNTRIES = new HashSet<String>() {{
-            add("DENMARK");
-            add("SWEDEN");
-            add("FINLAND");
-        }}
-
-        // The first brace is creating a new AnonymousInnerClass and the
-        // second one declares an instance initializer block. This block
-        // is called when the anonymous inner class is created.
-        // This does not only work for Collections, it works for all
-        // non-final classes.
-
-    } // End main method
-} // End LearnJava class
-
-// You can include other, non-public outer-level classes in a .java file,
-// but it is not good practice. Instead split classes into separate files.
-
-// Class Declaration Syntax:
-// <public/private/protected> class <class name> {
-//    // data fields, constructors, functions all inside.
-//    // functions are called as methods in Java.
-// }
-
-class Bicycle {
-
-    // Bicycle's Fields/Variables
-    public int cadence; // Public: Can be accessed from anywhere
-    private int speed;  // Private: Only accessible from within the class
-    protected int gear; // Protected: Accessible from the class and subclasses
-    String name; // default: Only accessible from within this package
-    static String className; // Static class variable
-
-    // Static block 
-    // Java has no implementation of static constructors, but
-    // has a static block that can be used to initialize class variables 
-    // (static variables). 
-    // This block will be called when the class is loaded.
-    static {
-        className = "Bicycle";
-    }
-
-    // Constructors are a way of creating classes
-    // This is a constructor
-    public Bicycle() {
-        // You can also call another constructor:
-        // this(1, 50, 5, "Bontrager");
-        gear = 1;
-        cadence = 50;
-        speed = 5;
-        name = "Bontrager";
-    }
-    // This is a constructor that takes arguments
-    public Bicycle(int startCadence, int startSpeed, int startGear,
-        String name) {
-        this.gear = startGear;
-        this.cadence = startCadence;
-        this.speed = startSpeed;
-        this.name = name;
-    }
-
-    // Method Syntax:
-    // <public/private/protected> <return type> <function name>(<args>)
-
-    // Java classes often implement getters and setters for their fields
-
-    // Method declaration syntax:
-    // <access modifier> <return type> <method name>(<args>)
-    public int getCadence() {
-        return cadence;
-    }
-
-    // void methods require no return statement
-    public void setCadence(int newValue) {
-        cadence = newValue;
-    }
-    public void setGear(int newValue) {
-        gear = newValue;
-    }
-    public void speedUp(int increment) {
-        speed += increment;
-    }
-    public void slowDown(int decrement) {
-        speed -= decrement;
-    }
-    public void setName(String newName) {
-        name = newName;
-    }
-    public String getName() {
-        return name;
-    }
-
-    //Method to display the attribute values of this Object.
-    @Override // Inherited from the Object class.
-    public String toString() {
-        return "gear: " + gear + " cadence: " + cadence + " speed: " + speed +
-            " name: " + name;
-    }
-} // end class Bicycle
-
-// PennyFarthing is a subclass of Bicycle
-class PennyFarthing extends Bicycle {
-    // (Penny Farthings are those bicycles with the big front wheel.
-    // They have no gears.)
-
-    public PennyFarthing(int startCadence, int startSpeed) {
-        // Call the parent constructor with super
-        super(startCadence, startSpeed, 0, "PennyFarthing");
-    }
-
-    // You should mark a method you're overriding with an @annotation.
-    // To learn more about what annotations are and their purpose check this
-    // out: http://docs.oracle.com/javase/tutorial/java/annotations/
-    @Override
-    public void setGear(int gear) {
-        this.gear = 0;
-    }
-}
-
-// Interfaces
-// Interface declaration syntax
-// <access-level> interface <interface-name> extends <super-interfaces> {
-//     // Constants
-//     // Method declarations
-// }
-
-// Example - Food:
-public interface Edible {
-    public void eat(); // Any class that implements this interface, must
-                       // implement this method.
-}
-
-public interface Digestible {
-    public void digest();
-    // In Java 8, interfaces can have default method.
-    // public void digest() {
-    //     System.out.println("digesting ...");
-    // }
-}
-
-// We can now create a class that implements both of these interfaces.
-public class Fruit implements Edible, Digestible {
-    @Override
-    public void eat() {
-        // ...
-    }
-
-    @Override
-    public void digest() {
-        // ...
-    }
-}
-
-// In Java, you can extend only one class, but you can implement many
-// interfaces. For example:
-public class ExampleClass extends ExampleClassParent implements InterfaceOne,
-    InterfaceTwo {
-    @Override
-    public void InterfaceOneMethod() {
-    }
-
-    @Override
-    public void InterfaceTwoMethod() {
-    }
-
-}
-
-// Abstract Classes
-
-// Abstract Class declaration syntax
-// <access-level> abstract <abstract-class-name> extends <super-abstract-classes> {
-//     // Constants and variables
-//     // Method declarations
-// }
-
-// Marking a class as abstract means that it contains abstract methods that
-// must be defined in a child class. Similar to interfaces, abstract classes
-// cannot be instantiated, but instead must be extended and the abstract
-// methods defined. Different from interfaces, abstract classes can contain a
-// concrete and abstract methods. Methods in an interface cannot have a body,
-// mixture of unless the method is static, and variables are final by default,
-// unlike an abstract class. Also abstract classes CAN have the "main" method.
-public abstract class Animal
-{
-    public abstract void makeSound();
-
-    // Method can have a body
-    public void eat()
-    {
-        System.out.println("I am an animal and I am Eating.");
-        // Note: We can access private variable here.
-        age = 30;
-    }
-
-    // No need to initialize, however in an interface
-    // a variable is implicitly final and hence has
-    // to be initialized.
-    protected int age;
-
-    public void printAge()
-    {
-        System.out.println(age);  
-    }
-
-    // Abstract classes can have main function.
-    public static void main(String[] args)
-    {
-        System.out.println("I am abstract");
-    }
-}
-
-class Dog extends Animal
-{
-    // Note still have to override the abstract methods in the
-    // abstract class.
-    @Override
-    public void makeSound()
-    {
-        System.out.println("Bark");
-        // age = 30;    ==> ERROR!    age is private to Animal
-    }
-
-    // NOTE: You will get an error if you used the
-    // @Override annotation here, since java doesn't allow
-    // overriding of static methods.
-    // What is happening here is called METHOD HIDING.
-    // Check out this SO post: http://stackoverflow.com/questions/16313649/
-    public static void main(String[] args)
-    {
-        Dog pluto = new Dog();
-        pluto.makeSound();
-        pluto.eat();
-        pluto.printAge();
-    }
-}
-
-// Final Classes
-
-// Final Class declaration syntax
-// <access-level> final <final-class-name> {
-//     // Constants and variables
-//     // Method declarations
-// }
-
-// Final classes are classes that cannot be inherited from and are therefore a
-// final child. In a way, final classes are the opposite of abstract classes
-// because abstract classes must be extended, but final classes cannot be
-// extended.
-public final class SaberToothedCat extends Animal
-{
-    // Note still have to override the abstract methods in the
-    // abstract class.
-    @Override
-    public void makeSound()
-    {
-        System.out.println("Roar");
-    }
-}
-
-// Final Methods
-public abstract class Mammal()
-{
-    // Final Method Syntax:
-    // <access modifier> final <return type> <function name>(<args>)
-
-    // Final methods, like, final classes cannot be overridden by a child
-    // class, and are therefore the final implementation of the method.
-    public final boolean isWarmBlooded()
-    {
-        return true;
-    }
-}
-
-// Enum Type
-//
-// An enum type is a special data type that enables for a variable to be a set
-// of predefined constants. The variable must be equal to one of the values
-// that have been predefined for it. Because they are constants, the names of
-// an enum type's fields are in uppercase letters. In the Java programming
-// language, you define an enum type by using the enum keyword. For example,
-// you would specify a days-of-the-week enum type as:
-public enum Day {
-    SUNDAY, MONDAY, TUESDAY, WEDNESDAY,
-    THURSDAY, FRIDAY, SATURDAY 
-}
-
-// We can use our enum Day like that:
-public class EnumTest {
-    // Variable Enum
-    Day day;
-    
-    public EnumTest(Day day) {
-        this.day = day;
-    }
-    
-    public void tellItLikeItIs() {
-        switch (day) {
-            case MONDAY:
-                System.out.println("Mondays are bad.");
-                break;
-            case FRIDAY:
-                System.out.println("Fridays are better.");
-                break;   
-            case SATURDAY: 
-            case SUNDAY:
-                System.out.println("Weekends are best.");
-                break;     
-            default:
-                System.out.println("Midweek days are so-so.");
-                break;
-        }
-    }
-    
-    public static void main(String[] args) {
-        EnumTest firstDay = new EnumTest(Day.MONDAY);
-        firstDay.tellItLikeItIs(); // => Mondays are bad.
-        EnumTest thirdDay = new EnumTest(Day.WEDNESDAY);
-        thirdDay.tellItLikeItIs(); // => Midweek days are so-so.
-    }
-}
-
-// Enum types are much more powerful than we show above. 
-// The enum body can include methods and other fields.
-// You can see more at https://docs.oracle.com/javase/tutorial/java/javaOO/enum.html
-```
-
-## مطالب بیشتر
-
-لینکهای زیر را می توانید برای پیگیرهای بیشتر استفاده کنید.
-البته همیشه گوگل را در کنار دستتان داشته باشید!
-
-**سایت های راهنمای اصلی**:
-
-* [Java Tutorial Trail from Sun / Oracle](https://docs.oracle.com/javase/tutorial/index.html)
-
-* [Java Access level modifiers](https://docs.oracle.com/javase/tutorial/java/javaOO/accesscontrol.html)
-
-* [Object-Oriented Programming Concepts](https://docs.oracle.com/javase/tutorial/java/concepts/index.html):
-    * [Inheritance](https://docs.oracle.com/javase/tutorial/java/IandI/subclasses.html)
-    * [Polymorphism](https://docs.oracle.com/javase/tutorial/java/IandI/polymorphism.html)
-    * [Abstraction](https://docs.oracle.com/javase/tutorial/java/IandI/abstract.html)
-
-* [Exceptions](https://docs.oracle.com/javase/tutorial/essential/exceptions/index.html)
-
-* [Interfaces](https://docs.oracle.com/javase/tutorial/java/IandI/createinterface.html)
-
-* [Generics](https://docs.oracle.com/javase/tutorial/java/generics/index.html)
-
-* [Java Code Conventions](https://www.oracle.com/technetwork/java/codeconvtoc-136057.html)
-
-* New features in Java 8:
-    * [Lambda expressions (functional programming)](https://docs.oracle.com/javase/tutorial/java/javaOO/lambdaexpressions.html)
-    * [Date and time API (java.time package)](http://www.oracle.com/technetwork/articles/java/jf14-date-time-2125367.html)
-
-**راهنما و سایت های آموزشی**
-
-* [Learneroo.com - Learn Java](http://www.learneroo.com)
-
-* [Codingbat.com](http://codingbat.com/java)
-
-**کتاب‌ها**:
-
-* [Head First Java](http://www.headfirstlabs.com/books/hfjava/)
-
-* [Thinking in Java](https://www.amazon.com/Thinking-Java-4th-Bruce-Eckel/dp/0131872486/)
-
-* [Objects First with Java](https://www.amazon.com/Objects-First-Java-Practical-Introduction/dp/0132492660)
-
-* [Java The Complete Reference](https://www.amazon.com/gp/product/0071606300)