Add comments.

Author: lima-1thing

src/com/codenext/day3/RandomNumberArray.java

@@ -6,34 +6,40 @@
 import java.util.Scanner;
 
 public class RandomNumberArray {
-  static public void main(String args[]){
-    System.out.print("Please enter array size:");
-    int size = new Scanner(System.in).nextInt();
-
-    int[] arr = new int[size];
-    for( int i=0; i<arr.length; i++){
-      arr[i] = new Random().nextInt(size);
-    }
 
-    System.out.println("Array has been initialized as below:");
+  static void printArray(int[] arr){
     for (int i=0; i<arr.length; i++) {
       if ( i!=0 ) {//skip the first item, so we won't get , in front of it.
         System.out.print(", ");
       }
       System.out.print(String.valueOf(arr[i]));
     }
-
     System.out.println();
+  }
 
+  static void revertPrintArray(int[] arr){
     for (int i=arr.length-1; i>=0; i--) {
       if ( i!=arr.length-1 ) {//skip the first item, so we won't get , in front of it.
         System.out.print(", ");
       }
       System.out.print(String.valueOf(arr[i]));
     }
+    System.out.println();
+  }
+  static public void main(String args[]){
+    System.out.print("Please enter array size:");
+    int size = new Scanner(System.in).nextInt();
+
+    int[] arr = new int[size];
+    for( int i=0; i<arr.length; i++){
+      arr[i] = new Random().nextInt(size);
+    }
+
+    System.out.println("Array has been initialized as below:");
+    printArray(new int[]{1,2,3});
+    revertPrintArray(arr);
 
     Arrays.sort(arr);
-    System.out.println();
-    ArrayUtils.printArray(arr);
+    printArray(arr);
   }
 }

src/com/codenext/day4/Circle.java

@@ -1,5 +1,27 @@
 package com.codenext.day4;
-
+/*
+Print a circle:
+          *
+      *********
+    *************
+   ***************
+  *****************
+ *******************
+ *******************
+*********************
+*********************
+*********************
+*********************
+*********************
+*********************
+ *******************
+ *******************
+  *****************
+   ***************
+    *************
+      *********
+          *
+ */
 public class Circle {
   static void print(String s){
     System.out.print(s);

src/com/codenext/day4/Triangle.java

@@ -1,5 +1,29 @@
 package com.codenext.day4;
 
+/*
+Print a right and isosceles triangle
+*
+**
+***
+****
+*****
+******
+*******
+********
+*********
+**********
+
+          *
+         ***
+        *****
+       *******
+      *********
+     ***********
+    *************
+   ***************
+  *****************
+ *******************
+ */
 public class Triangle {
   static void print(String s){
     System.out.print(s);
@@ -11,7 +35,6 @@ static void println(){
     System.out.println();
   }
   static void printIsoscelesTriangle(int size){
-
     for(int i=0; i<size; i++){
       //print padding
       for( int j=size-i-1; j>=0; j--){