Merge pull request #86 from JosephMPignataro/master

Adding a Node class and Binary Tree Sorting algorithm

Misc/Node.java

@@ -0,0 +1,16 @@
+public class Node {
+	 public Object anElement;
+	 public Node less;
+	 public Node greater;
+	 
+	 public Node(Object theElement) {
+	    this(theElement, null, null); //an empty node at the end will be by itself with no children, therefore the other 2 parameters are always null
+	                                  //obviously the node can still be a child of other elements
+    }
+
+	 public Node(Object currentElement, Node lessSide, Node greaterSide) {
+	  anElement = currentElement;
+	  this.less = lessSide;
+	  this.greater = greaterSide;
+	 }
+}

Sorts/BinaryTreeSort.java

@@ -0,0 +1,80 @@
+import java.util.Arrays;
+public class TreeSort {
+	
+	public Node root;
+
+	public TreeSort(Object x) { 
+		root = new Node(x);
+	}//end TreeSort constructor
+
+	public Node insert(Node node, Integer x) {
+		if (node == null) {
+			return node = new Node(x);
+		}//end if
+		if (x < (Integer) node.anElement) {
+			node.less = insert(node.less, x);
+		} //end if
+		else {
+			node.greater = insert(node.greater, x);
+		}//end else
+		return node;
+	}//end insert
+	
+	
+	public Node decimalInsert(Node node, Double x) {
+		if (node == null) {
+			return node = new Node(x);
+		}//end if
+		if (x < (Double) node.anElement) {
+			node.less = decimalInsert(node.less, x);
+		} //end if
+		else {
+			node.greater = decimalInsert(node.greater, x);
+		}//end else
+		return node;
+	}//end insert
+ 
+ 
+ public void treeSort(Node node) {
+	 if (node != null) {
+		 treeSort(node.less);
+		 System.out.print(((Object) node.anElement) + ", ");
+		 treeSort(node.greater);
+	 }//end if
+ }//end TreeSort class 
+ 
+ 
+
+public static void main(String args[]) {
+	 int[] intArray = {12, 40, 9, 3, 19, 74, 7, 31, 23, 54, 26, 81, 12 };
+	 	TreeSort ts = new TreeSort(new Integer(intArray[0]));
+	 	for (int i = 1; i < intArray.length; i++) { //sorts every index of the list one at a time
+	 		ts.insert(ts.root, new Integer(intArray[i])); //builds on the tree from a root node
+	 	}//end for
+	  		System.out.print("Integer Array Sorted in Increasing Order: ");
+	  	ts.treeSort(ts.root);
+	  		System.out.println(); //To sort a test array of integers
+	  	
+	 Double[] decimalArray = {8.2, 1.5, 3.14159265, 9.3, 5.1, 4.8, 2.6};
+	 	TreeSort dts = new TreeSort(new Double(decimalArray[0]).doubleValue());
+	 	for (int i = 1; i < decimalArray.length; i++) { //sorts every index of the list one at a time
+	 		dts.decimalInsert(dts.root, new Double(decimalArray[i]).doubleValue()); //builds on the tree from a root node
+	 	}//end for
+	 		System.out.print("Decimal Array, Sorted in Increasing Order: ");
+	  	dts.treeSort(dts.root);
+	  		System.out.println();
+	  		
+	 String[] stringArray = {"c", "a", "e", "b","d", "dd","da","zz", "AA", "aa","aB","Hb", "Z"};
+        int last = stringArray.length;
+        Arrays.sort(stringArray); //Uses an imported arrays method to automatically alphabetize 
+        	System.out.print("String Array Sorted in Alphabetical Order: ");
+        ts.insert(ts.root, last);
+        for(int i=0; i<last; i++){	
+        	System.out.print(stringArray[i]+"\t");
+            	//To sort a test array of strings hard coded in the main method
+            	//Please Note that Capital letters always come before lower case 
+            	//I tried to make the test array show its behavior clearly
+        }//end for 
+}//end Main method
+}//end TreeSort class
+