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For each question, please show your work. 4. (10 pts) Suppose that list1 (ArrayList<Object>) is a...

For each question, please show your work.

4. (10 pts) Suppose that list1 (ArrayList<Object>) is a list that contains the strings “red”, “yellow”, and “green”, and that list2 (ArrayList<String>) is another list that contains the strings “red”, “yellow”, and “blue”. Answer the following questions (All the questions are independent to each other):

  1. What is list1 after executing list1.addAll(list2)?

  2. What is list1 after executing list1.add(list2)?

  3. What is list1 after executing list1.removeAll(list2)?

  4. What is list1 after executing list1.remove(list2)?

  5. What is list1 after executing list1.retainAll(list2)?

  6. What is list1 after executing list1.clear()?

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Answer #1 
What is list1 after executing list1.addAll(list2)?
[red, yellow, green, red, yellow, blue]

What is list1 after executing list1.add(list2)?
Compile-time error.
Error: "java: incompatible types: java.util.ArrayList<java.lang.String> cannot be converted to java.lang.String"

What is list1 after executing list1.removeAll(list2)?
[green]

What is list1 after executing list1.remove(list2)?
[red, yellow, green]

What is list1 after executing list1.retainAll(list2)?
[red, yellow]

What is list1 after executing list1.clear()?
[]
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