6. The Counter
1. Import the Counter
The counter class can be imported into your Greenfoot world.
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Select Edit in the main Greenfoot window then 'Import Class...' and choose Counter.
The Counter class will appear in the Actor classes list.
Right-click on the Counter, choose the 'new Counter()' option and drag it into the world.
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Now right-click on the background and select 'Save the World' once you have dragged the counter into the world.
2. Increase the Counter by 1
Two lines of code are required to increase the counter.
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Add this code when your main character is removing the collectible object.
This code allows your main character to access the 'add' method from the Counter class.
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The method 'add' just increases the value of the counter by the number in the brackets.
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To decrease the counter, type a negative value in the brackets, such as -1.
3. Compile and Run
Click the Compile button at the top of the code editor.
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Then you can go back to the main Greenfoot window and click Run to test if your counter increases.