Guessing Game

Here are some instructions on how to create the guessing game we coded in grade 10 in the NetBeans program.

1. Make a new project. All programs must go inside projects.

• File -> New Project
• Choose a General, then Java Application
• Choose a project name, say Guessing.
• Finish.

2. This will appear on the left hand side. The little java cup is the Project you made. It automatically creates a little box (package) that is called guessing for you.

• Right Click on the little package called guessing and Choose a new JFrame.

3. Next, you are going to drag and drop together this interface.

• There are 5 labels, Title, Instructions, Picture and 2 blank labels.
• There is one Textfield and one button.
• Click on the various things in the palette, add them to the screen and play with the properties below. Text is an important attribute.

4. To add the picture:

• Set up a gif file and save it someplace handy.
• Click on the ... by the icon in the properties of your label.

5. Right click on the button. Choose Event -> Action -> actionPerformed.

• This will add an actionListener, set up ActionPerformed and set up a method for it.

6. Switch to the "Source" tab (if the porgram hasn't done it automatically).

• You need to add two global variables.

   int num = (int)(Math.round(Math.random()*100)+1);
   int tries=0;

7. You need to add the code to the button's actionPerformed method.

• Check that your widgets have the same names as below.

private void jButton1ActionPerformed(java.awt.event.ActionEvent    evt) {//GEN-FIRST:event_jButton1ActionPerformed
   int guess = Integer.parseInt(jTextField1.getText());
   jTextField1.setText("");
   if (num==guess)
   {jLabel3.setText("You win! You guessed "+num+" in "+tries+"    guesses.");
   jLabel5.setText("The number has selected a new number to play again.");
   num = (int)(Math.round(Math.random()*100)+1);
   tries=0;
   }
   else if(guess>num)
   {tries++;
   jLabel3.setText(guess+ " is too high. Guess again.");
   jLabel5.setText("You have taken "+tries+" guesses.");
   }
   else
   {tries++;
   jLabel3.setText(guess+ " is too low. Guess again.");
   jLabel5.setText("You have taken "+tries+" guesses.");
   }
   }

8. Right click on the JFrame inside the package (mine is called GuessingGame.java).

• Choose to run the application.
• If errors appear, fix them and run again.
• You can ignore the input window.

9. Test your game and make necessary changes.

10. Extra files that are created (Look in the folder you told NetBeans to save the files to):

• in the src folder inside the Guessing Game folder, there is the source code (ie. .java files). If you open these in Ready to Program, you can run them.
• in the build, classes folders are the .class files.
• If you choose Build -> Build Main inside NetBeans then a folder is created called dist. Inside there is a .jar file and a folder containing a swing-layout file. If you zip the file and the folder, and distribute it, anyone can play your game by double clicking on the jar file. A .jar file is the equilvalent of java's .exe file. You don't even need to distribute the pictures.

11. Create the Magic 8 Ball game we created in grade 10 by modelling these instructions. Here is the GUI.