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Please give an example of an array and the String you want to create from it.
The String class has methods that can help you.

Where does the code assign a value to array? You need to add code that assigns a value to array.
Take a look at the tutorial:
http://docs.oracle.com/javase/tutorial/java/nutsandbolts/arrays.html

Where do you assign a value to the array variable? It will have a null value if it is not assigned a value.

Try to compile the program to get a compiler error message. Copy and paste the full text of the compiler error message here.
It's hard to suggest a fix without knowing what the problem is.
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Please copy and paste here the full text of the error messages.