first class

20092018/PrimitiveDataTypesCheatSheet.java

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+/*
+  The Java programming language is statically-typed, which means that all
+  variables must first be declared before they can be used. This involves
+  stating the variable's type and name.
+*/
+public class PrimitiveDataTypesCheatSheet{
+
+  public static void main(String[] args) {
+
+        /*
+          By default, the int data type is a 32-bit signed two's complement integer,
+          which has a minimum value of -231 and a maximum value of 231-1.
+          In Java SE 8 and later, you can use the int data type to represent an
+          unsigned 32-bit integer, which has a minimum value of 0 and a maximum value of 232-1
+        */
+        int StudentsInTheClasroom;
+
+        /*
+          Use this data type when you need a range of values wider than those provided by int.
+          The Long class also contains methods like compareUnsigned, divideUnsigned etc to support
+          arithmetic operations for unsigned long.
+        */
+        long twoRaisedToMoreThanThirty;
+
+        /*
+          As with the recommendations for byte and short, use a float (instead of double)
+          if you need to save memory in large arrays of floating point numbers.
+          This data type should never be used for precise values, such as currency
+        */
+        float temperature;
+
+        /*
+          For decimal values, this data type is generally the default choice.
+          As mentioned above, this data type should never be used for precise values, such as currency.
+        */
+        double pi;
+
+        /*
+          The boolean data type has only two possible values: true and false.
+          Use this data type for simple flags that track true/false conditions.
+          This data type represents one bit of information, but its "size" isn't something that's precisely defined.
+        */
+        boolean pregnant = 1;
+
+        /*
+          he char data type is a single 16-bit Unicode character.
+          It has a minimum value of '\u0000' (or 0) and a maximum value of '\uffff' (or 65,535 inclusive).
+        */
+        char gender = 'F';
+
+
+
+  }
+
+}

20092018/README.md

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+# Getting Started
+
+**[LECTURE MATERIAL](http://kitlei.web.elte.hu/segedanyagok/foliak/java/en-java-bsc/01basics.pdf)**
+Here we have a simple HelloWorld example =) Let's go through it.
+
+If you are using your computer, you should first install the JVM, check how to do it on the  [Official Documentation](https://www.java.com/en/download/help/download_options.xml), when installing on Windows, you may need to configure System Variables. **Java is already configured on the Lab machines**.
+
+## How to compile and execute using Java?
+
+    // Compile:
+    javac MyClassExampleName.java
+
+    // Execute
+    java MyClassExampleName
+
+Yes I know, you found out the amazing power of pressing tab and having the auto-complete name of the class, but it is not compiling, that's because you should not add the extension.
+
+### Cheatsheet for navigating on the command lines:
+
+#### Windows:
+
+    # To navigate forward
+    CD [FOLDER_NAME]
+
+    # To navigate back
+    CD..
+
+    # Clean the screen
+    CLR     
+
+    # Show the current directory
+    DIR
+
+
+#### Linux/Mac:
+
+    # To navigate forward
+    CD [FOLDER_NAME]
+
+    # To navigate back
+    CD ..
+
+    # Clean the screen
+    clear
+
+    # Show the current directory
+    ls
+
+### Installing JDK on Windows
+
+[Installing:](http://docs.oracle.com/javase/7/docs/webnotes/install/windows/jdk-installation-windows.html)
+
+[Creating Environment variables: ](https://www.mkyong.com/java/how-to-set-java_home-on-windows-10/)
+
+
+## Exercises
+This module has a HackerRank challenge, you can check it on the following page: [www.hackerrank.com/elte-basicjava-module-1](http://www.hackerrank.com/elte-basicjava-module-1)
+
+
+## Documentation regarding the examples:
+
+Data Types:
+* [Data Types (integer, char, float etc )](https://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html)
+
+Loops:
+* [For Loop](https://docs.oracle.com/javase/tutorial/java/nutsandbolts/for.html)
+* [While and do-while loops](https://docs.oracle.com/javase/tutorial/java/nutsandbolts/while.html)
+
+Operators:
+* [Binary and Unary Operators (x+y, x*y, x++. --x etc)](https://docs.oracle.com/javase/tutorial/java/nutsandbolts/op1.html)
+
+Functions:
+* [Our sweet "Sysout" functions print, println, format etc](https://docs.oracle.com/javase/tutorial/essential/io/formatting.html)
+
+Packages:
+* [Math](https://docs.oracle.com/javase/8/docs/api/java/lang/Math.html)
+* [Random](https://docs.oracle.com/javase/7/docs/api/java/util/Random.html)
+
+Arrays:
+* [Java Tutorial](https://docs.oracle.com/javase/tutorial/java/nutsandbolts/arrays.html)