Bubble sort code added

Author: me-shaon

.gitignore

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+#Intro
+
+
+### Primitive types or data structures in Java
+Integer, Float, Boolean, Char 

README.md

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+
+public class Bubble 
+{
+	//Following function will sort the array in Increasing (ascending) order
+    void sort(int arr[])
+    {
+        int n = arr.length;
+        
+        for (int i = 0; i < n-1; i++)
+        {
+        	// Last i elements are already in place, so the inner loops will run until it reaches the last i elements
+            for (int j = 0; j < n-i-1; j++)
+            {
+            	if (arr[j] > arr[j+1]) //To Sort in decreasing order, change the comparison operator to '<'
+                {
+                    int temp = arr[j];
+                    arr[j] = arr[j+1];
+                    arr[j+1] = temp;
+                }
+            }
+        }
+    }
+    
+    void modified_sort(int arr[])
+    {
+        int n = arr.length;
+        
+        for (int i = 0; i < n-1; i++)
+        {
+        	boolean flag = false; //Taking a flag variable
+        	
+        	// Last i elements are already in place
+            for (int j = 0; j < n-i-1; j++)
+            {
+            	if (arr[j] > arr[j+1]) //To Sort in decreasing order, change the comparison operator to '<'
+                {
+                    int temp = arr[j];
+                    arr[j] = arr[j+1];
+                    arr[j+1] = temp;
+                    
+                    flag = true; //Setting the flag, if swapping occurs
+                }
+            }
+            
+            if(!flag) //If not swapped, that means the list has already sorted
+            {
+                break;
+            }
+        }
+    }
+}

Sorting/Bubble Sort/Bubble.java

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+public class Main 
+{
+	// Prints the array 
+    private static void printList(int arr[])
+    {
+        int n = arr.length;
+        for (int i=0; i<n; ++i)
+            System.out.print(arr[i] + " ");
+        System.out.println();
+    }
+    
+	public static void main(String[] args) 
+	{
+		Bubble bubble = new Bubble();
+        int arr[] = {64, 34, 25, 12, 22, 11, 90};
+        bubble.sort(arr);
+        //bubble.modified_sort(arr);
+        System.out.println("Sorted array");
+        printList(arr);
+	}
+
+}

Sorting/Bubble Sort/Main.java

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+# Bubble Sort
+
+**Bubble Sort** is an algorithm which is used to sort **N** elements that are given in a memory for eg: an Array with N number of elements. Bubble Sort compares all the element one by one and sort them based on their values.
+
+It is called Bubble sort, because *with each iteration the smaller element in the list bubbles up towards the first place*, just like a water bubble rises up to the water surface.
+
+Sorting takes place by stepping through all the data items one-by-one in pairs and comparing adjacent data items and swapping each pair that is out of order.
+![bubble sort demonstration](bubble-sort.png)