How to import code in NetBeans and make it complete.

how to import code in NetBeans...this is game Drawing Envelope without lifting the pen.
witch mean the player only choose A/B/C/D/E as first move then 2th and so on.
how do i make it in NetBeans can someone can help me complete this game using the code given.

Code java:

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/**
 * 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 envelope2
{
    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'};
            int nodeTotal =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);
             path[nodeTotal]=currentNode;  // store node passed
             char prevNode='\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");
            }
 
            // Display current path
            for (int i=0; i < path.length; i++)
            {
                if (path[i]!='\0') 
                 System.out.println(i+1+" : "+path[i]);
                else  System.out.println(i+1+" : "+ '-');
            }
            nodeTotal++;
 
 
        //   3.3 User choose next node
              char nextNode; 
              boolean invalidNode= true;
              int attempt=0;
 
              do {
                 System.out.println(" Please select next node");
                 userInputStr = in.next();
                 nextNode = userInputStr.charAt(0);
 
        //   3.4 Check  valid choice, repeat if invalid node was chosen
 
                 if (nextNode == currentNode){
                    System.out.println("!!! Invalid path- Same Node");
                    invalidNode = true;
                 }
                 else {
 
                        if (nextNode == prevNode){
                           System.out.println("!!! Invalid path- repeated path");
                           invalidNode = true;
                         }
                        else invalidNode = false; // next node selected is legal        
                      }
 
                 for (int i=1; i < path.length; i++) {
                    if ((currentNode == path[i]) && (nextNode == path[i-1])) {
                       System.out.println("!!! Invalid path- repeated path");
                        invalidNode = true; //path already exist
                        break;
                    }  
 
                    else if ((currentNode == path[i]) && (nextNode == path[i+1])) {
                            System.out.println("!!! Invalid path- repeated path");
                            invalidNode = true; //path already exist
                            break;
                          }  
                  } 
              } while (invalidNode);             
 
            path[nodeTotal] = nextNode;
            prevNode=currentNode; // to keep track repeated path- not allowed
            currentNode = nextNode;
 
 
            if (nodeTotal == 8) {
 
                // Display complete path
              for (int i=0; i < path.length; i++)
              {
                if (path[i]!='\0') 
                 System.out.println(i+1+" : "+path[i]);
                else  System.out.println(i+1+" : "+ '-');
              }
              System.out.println("CONGRATULATIONS !!!");
               gameover = true;
            }
        //   3.5 if game not over
        //         3.5.1 Store choice in path
        //         3.5.2 Repeat 3.2
 
 
     } // gameover  
 
   }// main
} // envelope

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Please use the code tags when posting code.

Which part of this is giving you trouble? What happens when you compile it?

When i compile it OK completely work but i dont know how to use this coding in Netbeans.
first of all this code is from BlueJ but i going to use Netbeans i just dont know how.

What exactly does that mean? What do you mean by "use this coding"? You should be able to type the same code in any editor.