To use an arraylist in your program, you must import: 1. the java. collections package
2. the java. awt package
3. nothing; the class is automatically available, just like regular arrays.
4. the java. util package
5. the java. lang package

Option 4: the java.util package

Explanation:

ArrayList is one of the Java collections that offer some handy features to manipulate a list of elements.  ArrayList is not available in a Java program by default without explicitly import it. To use ArrayList, we need to write an import statement as follows:

import java.util.ArrayList;

After that, we can only proceed to declare an ArrayList in our Java program. For example:

ArrayList<String> studentNames = new ArrayList<String>();

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explanation:

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