Thread: How to make this Java Code in NetBeans

Ok this is game name Envelope but i dont know how does it work.??please i need a hand.

/**
 * Draw envelope without lifting your pen.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
 
import java.util.Scanner; // to read input
public class envelope
{
    public static void main (String [] args) {
 
 
        //1. Display Instruction
 
        System.out.println("In this game player must choose path to draw an envelope");
        System.out.println("Whithout lifting a pen");
        System.out.println("    E");
        System.out.println("   /\\");
        System.out.println("  /  \\");
        System.out.println("  ___");
        System.out.println("D     C");
        System.out.println(" | X |");
        System.out.println("  ___");
        System.out.println("A     B");
 
        //2. Reset the game environment
        //   Possible choice for node A = {B,C,D}
            char [] nodeA = {'B','C','D'};
            char [] nodeB={'A','C','D'};
            char [] nodeC={'A','B','D','E'};
            char [] nodeD={'A','B','C','D'};
            char [] nodeE={'C','D'};
 
        // path chosen by user
            char [] path = {'\0','\0','\0','\0','\0','\0','\0','\0','\0'};
 
        // object Scanner to read input from keyboard
             Scanner in = new  Scanner (System.in);
 
        //3. Start the game
        //   3.1 User choose node
             System.out.println(" Please select node to start: A, B, C, D or E");
             String userInputStr = in.next();
             char currentNode = userInputStr.charAt(0);
 
        //   3.2 Display possible node
             Boolean gameover = false;
             while (!gameover) {
             switch (currentNode) {
                 case 'A' : 
                     System.out.println("Choices");
                     for (int i=0; i < nodeA.length; i++)
                         System.out.print(nodeA[i]+" ");
                     System.out.println();
                     break;
                  case 'B' : 
                     System.out.println("Choices");
                     for (int i=0; i < nodeB.length; i++)
                         System.out.print(nodeB[i]+" ");
                     System.out.println();
                     break;
                  case 'C' : 
                     System.out.println("Choices");
                     for (int i=0; i < nodeC.length; i++)
                         System.out.print(nodeC[i]+" ");
                     System.out.println();
                     break;
                 case 'D' : 
                     System.out.println("Choices");
                     for (int i=0; i < nodeD.length; i++)
                         System.out.print(nodeD[i]+" ");
                     System.out.println();
                     break;
                 case 'E' : 
                     System.out.println("Choices");
                     for (int i=0; i < nodeE.length; i++)
                         System.out.print(nodeE[i]+" ");
                     System.out.println();
                     break;
                default: System.out.println("Node NOT in the list");
            }
        //   3.3 User choose next node
              char nextNode;
             do {
                System.out.println(" Please select next node");
                 userInputStr = in.next();
                 nextNode = userInputStr.charAt(0);
 
        //   3.4 Check  valid choice
                if (nextNode == currentNode){
                  System.out.println("Invalid path- repeat path");
                }
            } while (nextNode == currentNode);
 
        //   3.5 if game not over
        //         3.5.1 Store choice in path
        //         3.5.2 Repeat 3.2
 
          currentNode = nextNode;
     } // gameover  
 
   }// main
} // envelope

Please wrap your code in the
[highlight=java][/highlight] tags to get the formatting

Define don't know how it works. I presume this is not your code...then study the lines in the code, step through it with a debugger, or add some println's to evaluate how variables change.