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Are you asking how to write an if statement?
See the tutorial: The if-then and if-then-else Statements (The Java™ Tutorials > Learning the Java Language > Language Basics)

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The numbers in the array have no meaning for me.

Can you answer this question?
What value(s) in the array means that it is OK to move a car there?

Use a if statement to detect if the array at...

How do you know there is a car in the location? What is in the array?
The Arrays class's deepToString() method is useful for printing out the contents of a 2 dim array for debugging:

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Can you use an if test to detect if the location is already occupied before changing it?

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