Java Programming

Choose correct option.

• Base::show() called

• Derived::show() called

• Compiler Error

• Runtime Error

Suppose that you have a collection of products for sale in a database and you need to display those products. The products are not unique. Which of the following collections classes in the java.util package best suit your needs for this scenario?

• Arrays

• ArrayList

• HashMap

• HashSet

Suppose that you need to work with a collection of elements that need to be sorted in their natural order, and each element has a unique string associated with its value. Which of the following collections classes in the java.util package best suit your needs for this scenario?

• ArrayList

• HashMap

• HashSet

• TreeMap

• TreeSet

What is the result of the given statements?

• onetwo

• onetwo7

• Compiler error on line 6

• Compiler error on line 7

Which of the answer choices are valid given the following declaration?

Map<String, Double> map = new HashMap<>();

• map.add("pi", 3.14159);

• map.add("e", 2L);

• map.add("log(1)", new Double(0.0));

• map.add('x', new Double(123.4));

• None of the above

What is the result of the given code?

• 16

• 25

• Compiler error on line 3.

• Compiler error on line 5.

• A runtime exception is thrown.

What is the result of the given code?

• false

• true

• Compiler error on line 4.

• Compiler error on line 7.

• A runtime exception is thrown.

Fill in the blanks to make this code compile and print 123. (Choose all that apply.)

• On line 6, fill in the blank with hasNext().

• On line 6, fill in the blank with isNext().

• On line 7, fill in the blank with next().

• On line 7, fill in the blank with getNext().

Which of the following pairs fills in the blanks to make this code compile?

• throw on line 5 and throw on line 6

• throw on line 5 and throws on line 6

• throws on line 5 and throw on line 6

• throws on line 5 and throws on line 6

Which of the following fills in the blank to make the code compile?

• FileNotFoundException e | IOException e

• FileNotFoundException | RuntimeException e

• IOException | RuntimeException e

• IOException e | RuntimeException e